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  • 1
    Online Resource
    Online Resource
    On the Fatigue of Shape Memory Alloys
    Trans Tech Publications, Ltd. ; 2013
    In:  Key Engineering Materials Vol. 594-595 ( 2013-12), p. 133-139
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 594-595 ( 2013-12), p. 133-139
    Abstract: When we use effectively shape memory alloys require knowledge of operational behavior at the thermal stresses and mechanical variables. Measurements performed on a CuZnAl alloy, revealed fatigue properties by considering the size of the maximum load deformation corresponding recovered memory. It requires knowledge in design fatigue behavior of shape memory alloy components after education, fatigue strength by performing partial memory loss or physical destruction. The properties of memory shape alloys recommend their use for complex mechanical applications in domains as follows medicine, robotics, aeronautics, electric contacts, actuators. Shape memory metal alloys in the construction of such installations are subject to mechanical stress, and the thermal stresses, so their inclusion in a computing system fatigue involves consideration of the function performed.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.594-595
    DOI: 10.4028/www.scientific.net/KEM.594-595.133
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2073306-9
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  • 2
    Online Resource
    Online Resource
    Improvement of Structural Characteristics for CuZn Alloy through Heat Treatments
    Trans Tech Publications, Ltd. ; 2017
    In:  Key Engineering Materials Vol. 750 ( 2017-8), p. 3-8
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 750 ( 2017-8), p. 3-8
    Abstract: The paper presents aspects of structure modifications and properties for a CuZn alloy, after the appliance of heat treatments, at their specific parameters. The samples subjected to analysis, coming from cast bar, from which have been taken standard samples, with specific dimensions for experiments.Nonferrous alloys are subject frequently to annealing, quenching and tempering. The annealing follows the homogenization of structure after casting. The quenching followed by tempering is a spectacular modality to modify the mechanical properties for numerous nonferrous alloys.The characteristics of alloys have highlighted by experiments, using standard samples specific to the requests. The determination of alloying elements was made on optical spectrometer. The researches by SEM and optical microscopy, confirm the improvement of properties by obtaining uniform structures according to the applied thermal processing.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.750
    DOI: 10.4028/www.scientific.net/KEM.750.3
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2017
    detail.hit.zdb_id: 2073306-9
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  • 3
    Online Resource
    Online Resource
    The Analysis of Physical-Structural Properties for AISI 321 Steel
    Trans Tech Publications, Ltd. ; 2016
    In:  Key Engineering Materials Vol. 700 ( 2016-7), p. 70-77
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 700 ( 2016-7), p. 70-77
    Abstract: The applications of stainless steels may be meeting in chemical industry, food industry, civil building, but present an increased interest also in machine constructions or household.This paper highlight the structural modifications obtained after temperature variations for AISI 321 stainless steel. The modifications of structure and proprieties can be induced by heat treatments applied to semi-products before or after the obtaining of final parts, but also by heating at regimes which respect the exploitation conditions of part. In the experiments, it is applied quenching to put into solution, with modification of final treatment temperature and maintaining time, aiming the dissolution of complex carbides and in this mode an easy processing. The treatment parameters were chosen, after the determination of alloying elements by AISI 321 samples, by optic spectrometry. The dilatometric analysis aimed to highlight the structural modifications, specific to thermal fatigue phenomenon, due to temperatures variations.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.700
    DOI: 10.4028/www.scientific.net/KEM.700.70
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2016
    detail.hit.zdb_id: 2073306-9
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  • 4
    Online Resource
    Online Resource
    The Analysis of Metallic Materials Subjected to Cycles of Thermal and Mechanical Fatigue
    Trans Tech Publications, Ltd. ; 2016
    In:  Key Engineering Materials Vol. 700 ( 2016-7), p. 78-85
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 700 ( 2016-7), p. 78-85
    Abstract: The paper present theoretical and practical aspects concerning to the phenomena of thermal / mechanical fatigue specific to metallic materials, which are found in the structure of industrial parts, subjected to thermal and mechanical requests, also in combination with the corrosion phenomenon, pressure different etc. The analyzed alloys subjected to thermal and mechanical fatigue requests, on a prototype testing installation, using samples from Cu-Zn-Al alloys, which have been processed at standard dimensions by machining. Function of chemical composition of alloy, after a variable number of cycles it was found the micro-cracks appearance that generates crack and finally the break of samples. The SEM realized at different magnifications, highlight the character of samples break.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.700
    DOI: 10.4028/www.scientific.net/KEM.700.78
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2016
    detail.hit.zdb_id: 2073306-9
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  • 5
    Online Resource
    Online Resource
    Ni-Cr Alloys Assessment for Dental Implants Suitability
    MDPI AG ; 2022
    In:  Applied Sciences Vol. 12, No. 24 ( 2022-12-13), p. 12814-
    Details
    In: Applied Sciences, MDPI AG, Vol. 12, No. 24 ( 2022-12-13), p. 12814-
    Abstract: The performance of the field and the condition of success in oral implantology today require the review and reevaluation of the means that contribute essentially to ensuring the stability and durability of the implant, starting from the nature of the biomaterial and continuing with the characteristics of the optimally designed biosurface. This paper proposes a comparative analysis of three commercial alloys, VeraBond, Kera N, and VeraSoft, compared to a modified dental alloy, with the aim of improving some mechanical properties. They have been studied structurally and mechanically. The microstructural structure shows that the alloys crystallize in the face-centered cube system, and the cast alloy has a dendritic structure with large grains. XRD diffractograms highlight that alloys exhibit three compounds Cr156.00 Al596.00: 9013031, Ni4.00, and Cr30.00Al48.00. The hardness measurements showed values between 203 HV and 430 HV. As the percentage of silicon increases, the hardness decreases. The modulus of elasticity obtained by the indentation method for the dental alloys was in the range of 46–153 GPa. The results showed that the hardness and elastic modulus of the new alloy was significantly minimized compared to the classical alloys used.
    Type of Medium: Online Resource
    ISSN: 2076-3417
    URL: Article
    DOI: 10.3390/app122412814
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2704225-X
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  • 6
    Online Resource
    Online Resource
    Mechanical Behaviour of CoCrMo Alloy with Si Content
    Trans Tech Publications, Ltd. ; 2015
    In:  Applied Mechanics and Materials Vol. 754-755 ( 2015-4), p. 1017-1022
    Details
    In: Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 754-755 ( 2015-4), p. 1017-1022
    Abstract: . The paper present aspects about the obtaining of non-precious dental alloys (type CoCrMo and CoCrMoSi7), the determination of chemical composition by optical emission spectrometry and the experimental tests for determining the tensile strength, made on standard plate samples. The base material used in experiments was a commercial alloy, from CoCrMo system, which belongs to the class of dental non-precious alloys, intended to medical applications. The obtaining of studied alloy was made on arc re-melting installation, under vacuum, type MRF ABJ 900. The process followed to realize a rapid melting, with a maximum admissible current intensity. The samples for tests were obtained by casting in an electric arc furnace, under vacuum, in optimal conditions for melting and solidification and processing by electro-erosion, to eliminate all the disturbing factors which come by processing conditions for the samples. The determination of chemical composition for cobalt based alloys, by optical emission spectrometry, was made on SpectromaxX equipment with spark. The electrical discharge is made with the elimination of an energy quantity, fact which determine plasma forming and light issue. Tensile tests for standard samples, made from cobalt based alloy, was made on Instron 3382 testing machine, and assisted by computer. The obtained results are: elongation, elasticity modulus, tensile strength and offer complete information about the analyzed mechanical properties. For the certitude of obtained experimental results, the tests were made on samples with specific dimensions according ISO 6892-1:2009(E) standard, both for the tensile strength, and also machine operation.
    Type of Medium: Online Resource
    ISSN: 1662-7482
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMM.754-755
    DOI: 10.4028/www.scientific.net/AMM.754-755.1017
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2015
    detail.hit.zdb_id: 2251882-4
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  • 7
    Online Resource
    Online Resource
    Ti-Mo Alloys Used in Medical Applications
    Trans Tech Publications, Ltd. ; 2015
    In:  Advanced Materials Research Vol. 1128 ( 2015-10), p. 105-111
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 1128 ( 2015-10), p. 105-111
    Abstract: Metallic biomaterials are used in various applications of the most important medical fields (orthopedic, dental and cardiovascular). The main metallic biomaterials are stainless steels, Co-based alloys and Ti-based alloys. Recently, titanium alloys are getting much attention for biomaterials because these types of materials have very good mechanical properties, good corrosion resistance and an excellent biocompatibility. The paper contains important information about titanium alloys used for biomedical applications, which are considered the most widely. It is very important to understand the microstructural evolution and property-microstructure relationship in implant alloys. In the present paper, authors present a short literature review on general aspects of promising biocompatible binary Ti-Mo alloys compared with CoCr and stainless steel alloys, as an alternative of the known metallic biomaterials. This alloys show superior mechanical compatibility and very good biocompatibility. The aim of this review is to highlight the mechanical properties for several types of biomaterials, their application in medical field, especially the Ti-Mo group.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.1128
    DOI: 10.4028/www.scientific.net/AMR.1128.105
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2015
    detail.hit.zdb_id: 2265002-7
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  • 8
    Online Resource
    Online Resource
    Improvement of Properties of Aluminum Bronze CuAl〈sub〉7〈/sub〉Mn〈sub〉3〈/sub〉 by Heat Treatments
    Trans Tech Publications, Ltd. ; 2014
    In:  Applied Mechanics and Materials Vol. 657 ( 2014-10), p. 412-416
    Details
    In: Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 657 ( 2014-10), p. 412-416
    Abstract: Top domains of technology, such as aerospace, nuclear technology, electrical engineering, electronics, energy, require materials and alloys with special properties: superconductivity, superplasticity, high resistance to corrosion, shape memory, exceptional mechanical strength, magnetism, and resistivity. Aluminum bronzes are bronze with very good mechanical and chemical properties, which are factory profiles, strips, bearings, gears, valves, parts and fittings for chemical and food industry, gears, water pump housings, mainly parts corrosion resistant in aggressive environments.
    Type of Medium: Online Resource
    ISSN: 1662-7482
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMM.657
    DOI: 10.4028/www.scientific.net/AMM.657.412
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2251882-4
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  • 9
    Online Resource
    Online Resource
    The Improvement of Stainless Steels Processing by Annealing
    Trans Tech Publications, Ltd. ; 2015
    In:  Applied Mechanics and Materials Vol. 754-755 ( 2015-4), p. 629-633
    Details
    In: Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 754-755 ( 2015-4), p. 629-633
    Abstract: The paper presents a study about the structural modifications induced by heat treatment at the stainless steels, like AISI 321 and AISI 304, frequently used in industrial applications. The principal characteristic of these steels is their bigger corrosion resistance, conferred by chrome and nickel.The addiction of other elements is made for the improvement of corrosion resistance in humid environments (molybdenum and cooper), mechanical characteristics at low and high temperatures (tungsten, molybdenum, niobium and cobalt). The necessary condition to obtaining a high corrosion resistance is that all chrome content to be in forms of solid solution. The precipitation of carbides from solid solution causing a decrease under 12% of chrome content, the structure become bi-phase and the corrosion resistance decrease. For the improvement of machinability may be applied an annealing, with respect of all the treatment parameters, obtaining a micro-hardness decrease.The heating for annealing was made in an electric furnace, type UTTIS, with fixed hearth. The imposed heating speed was 10°C/minute. The decrease of micro-hardness by annealing, permit an easy processing for high alloy steels.
    Type of Medium: Online Resource
    ISSN: 1662-7482
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMM.754-755
    DOI: 10.4028/www.scientific.net/AMM.754-755.629
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2015
    detail.hit.zdb_id: 2251882-4
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  • 10
    Online Resource
    Online Resource
    Study of Various Thin Films Obtained by Several Deposition Methods 〈sup〉〈/sup〉
    Trans Tech Publications, Ltd. ; 2014
    In:  Advanced Materials Research Vol. 1036 ( 2014-10), p. 201-206
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 1036 ( 2014-10), p. 201-206
    Abstract: Properties of metallic materials can be improved with special materials depositions. Materials deposited on base materials are qualitatively better than the base materials, with a better hydroabrasive wear and corrosion resistance, also with a chemical attack or mechanical stress improved resistance.The thin layer deposition represents depositions (coatings) with hardening, lubricating, or decorative function, having a thickness of less than 10 micrometers.Such special materials are used in cutting-edge technology, such as nuclear turbines and turbine airplanes, space crafts or submarines, which must withstand high temperature, erosion and different chemical attacks.Along with traditional technologies for obtaining coatings, we assist in the development, improvement and expansion of deposition modern techniques, which ensures high purity and adhesion through a wide variety of processes. These thin layer coated materials should not be very expensive from the economic point of view. That is why, scientists are looking to find out the easiest deposition methods and also with great technical efficiency.In this paper we presented several methods of thin film deposition. We also highlighted some of the advantages and disadvantages of some deposition methods.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.1036
    DOI: 10.4028/www.scientific.net/AMR.1036.201
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2265002-7
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