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  • Springer Science and Business Media LLC  (4)
  • 1990-1994  (4)
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  • Springer Science and Business Media LLC  (4)
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  • 1990-1994  (4)
Year
Subjects(RVK)
  • 1
    Online Resource
    Online Resource
    An Investigation of Phase Equilibria in the Ternary Al-Ti-Ta System
    Springer Science and Business Media LLC ; 1990
    In:  MRS Proceedings Vol. 213 ( 1990)
    Details
    In: MRS Proceedings, Springer Science and Business Media LLC, Vol. 213 ( 1990)
    Abstract: An investigation of the phase equilibria and phase transformation behavior in the Al-Ti-Ta system was conducted with an emphasis on developing alloys with stable microstructures and properties desirable for advanced aerospace applications. A series of ternary alloys containing 5 to 50 atomic percent Ta and varying amounts of Ti and Al were prepared by arc melting and characterized in the as-cast and heat treated (1450°C) conditions. Three stable two-phase regions (β-σ, β-α 2 . and Al 2 Ta-η) were identified and characterized at 1450°C. A stable ternary B2 phase was identified near the composition 25Al-5OTi-25Ta 1 and several binary phases were found to exhibit extensive solid solubilities. The results were used to construct a partial isothermal section at 1450°C for this system and to assess the complex phase transformations that occur upon cooling.
    Type of Medium: Online Resource
    ISSN: 0272-9172 , 1946-4274
    URL: Article
    DOI: 10.1557/PROC-213-163
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1990
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Tailored MoSi 2 /SiC composites by mechanical alloying
    Springer Science and Business Media LLC ; 1993
    In:  Journal of Materials Research Vol. 8, No. 6 ( 1993-06), p. 1428-1441
    Details
    In: Journal of Materials Research, Springer Science and Business Media LLC, Vol. 8, No. 6 ( 1993-06), p. 1428-1441
    Abstract: MoSi 2 -based composites have been synthesized through the mechanical alloying (MA) of elemental molybdenum and silicon powders with and without carbon additions. The interplay between the phase formation sequence in the powders and the microstructural evolution in the consolidated samples is described. It is shown that the glassy SiO 2 phase characteristic of conventional powder processed MoSi 2 can be effectively eliminated by combining mechanical alloying, carbon additions, and an in situ carbothermal reduction reaction. Using this approach, composites consisting of uniformly distributed micron-size SiC in an MoSi 2 matrix can be formed. The effect of important processing variables such as the extent of carbon additions, extraneous iron pickup during MA, partial pressures of oxygen, consolidation temperatures, and consolidation atmospheres is discussed based on the evidence obtained from DTA, TGA, TEM, and XRD.
    Type of Medium: Online Resource
    ISSN: 0884-2914 , 2044-5326
    URL: Article
    DOI: 10.1557/JMR.1993.1428
    RVK:
    VA 5350
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1993
    detail.hit.zdb_id: 54876-5
    detail.hit.zdb_id: 2015297-8
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Microstructural Evolution in Compositionally Tailored MoSi 2 /SiC Composites
    Springer Science and Business Media LLC ; 1993
    In:  MRS Proceedings Vol. 322 ( 1993)
    Details
    In: MRS Proceedings, Springer Science and Business Media LLC, Vol. 322 ( 1993)
    Abstract: Compositionally tailored MoSi 2 /SiC composites with silicon carbide content ranging from 0 to 60 volume percent were synthesized through a novel processing scheme involving the mechanical alloying of elemental molybdenum, silicon, and carbon. The effects of important processing parameters such as the nominal powder composition and the processing temperature on the microstructural evolution during mechanical alloying and subsequent heating are described based on the results obtained from DTA and XRD.
    Type of Medium: Online Resource
    ISSN: 0272-9172 , 1946-4274
    URL: Article
    DOI: 10.1557/PROC-322-291
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1993
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Effect Of Ceramic Dispersoids On The High Temperature Strength Of Mechanically Alloyed MoSi 2
    Springer Science and Business Media LLC ; 1990
    In:  MRS Proceedings Vol. 213 ( 1990)
    Details
    In: MRS Proceedings, Springer Science and Business Media LLC, Vol. 213 ( 1990)
    Abstract: Mechanical alloying (MA) has been used to synthesize MoSi 2 from elemental Mo and Si powders. SiC and A1 2 O 3 dispersoids were also incorporated as a means of increasing high temperature strength. After synthesis, the powders were consolidated using vacuum hot pressing. It is shown that the size and volume fraction of porosity increases anomalously with increasing hot pressing temperature over the range 1200 to 1700°C. The strengths of the A1 2 O 3 composite are, in most instances, considerably higher than the monolithic material produced under similar conditions.
    Type of Medium: Online Resource
    ISSN: 0272-9172 , 1946-4274
    URL: Article
    DOI: 10.1557/PROC-213-839
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1990
    Location Call Number Limitation Availability
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    Online Resource
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