Comparison of microstructural evolution in laser-deposited and arc-melted in-situ Ti-TiB composites

被引：43

作者：

Banerjee, R ^{[1
]}

Genç, A ^{[1
]}

Collins, PC ^{[1
]}

Fraser, HL ^{[1
]}

机构：

[1] Ohio State Univ, Ctr Accelerated Maturat Mat, Dept Mat Sci & Engn, Columbus, OH 43210 USA

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2004年 / 35A卷 / 07期

关键词：

D O I：

10.1007/s11661-004-0162-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In-situ Ti-TiB composites have been processed via two different routes: arc by melting elemental Ti and B and by direct laser deposition of a blend of elemental Ti and B powders using the laser-engineered net-shaping (LENS(TM)) process. The conventionally cast composite exhibits a significantly coarser-scale microstructure as compared with the LENS(TM)-deposited composite and consists of primary proeutectic TiB precipitates dispersed in an eutectic matrix. The microstructure of the LENS(TM)-deposited Ti-TiB composite consists of a fine-scale homogeneous dispersion of primary TiB precipitates in an alpha-Ti matrix. In addition, a nanometer-scale dispersion of secondary TiB precipitates is formed in the a matrix. The hardness and modulus of these composites have been measured using nanoindentation techniques. The ability to produce such a fine dispersion of TiB precipitates in near-net-shape, near-full-density Ti-TiB composites processed using LENS(TM) could potentially be highly beneficial from the viewpoint of applicability of these metal-matrix composites.

引用

页码：2143 / 2152

页数：10

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