In:
Journal of Physics D: Applied Physics, IOP Publishing, Vol. 43, No. 29 ( 2010-07-28), p. 295402-
Abstract:
A novel selective laser melting method was applied to consolidate the high-energy ball-milled nanostructured TiC P /Ti composite powder to prepare TiC x /Ti nanocomposites in bulk form. The substoichiometric TiC 0.625 with a hexagonal crystal structure acted as the reinforcing phase, having a lamellar nanostructure with an average thickness of ∼48 nm. The nanostructure of TiC 0.625 was coarsened and finally disappeared on decreasing the applied linear laser energy density. Reasonable physical mechanisms and conditions for the formation of nanostructured TiC x during laser processing were proposed. It was revealed that the formation of nanoscale hexagonal structured TiC 0.625 was due to the action of microscopic pressure induced by evaporative recoil and surface tension on (1 1 1) plane of the lamellar TiC x crystals. The disappearance of nanostructure of TiC 0.625 at a lower laser energy input was ascribed to a decreased microscopic pressure and an elevated carbon activity in the molten pool.
Type of Medium:
Online Resource
ISSN:
0022-3727
,
1361-6463
DOI:
10.1088/0022-3727/43/29/295402
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2010
detail.hit.zdb_id:
209221-9
detail.hit.zdb_id:
1472948-9
Permalink