Effect of Nb additions on microstructure and properties of γ-TiAl based alloys fabricated by selective laser melting

被引：50
作者：
Ismaeel, Adam [1 ]
Wang, Cun-shan [1 ]
机构：
[1] Dalian Univ Technol, Key Lab Mat Modificat Laser Ion & Electron Beam, Dalian 116024, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2019年 / 29卷 / 05期
基金：
中国国家自然科学基金;
关键词：
selective laser melting; gamma-TiAl based alloys; microstructure; properties; Nb additions; FORGED HIGH NB; MECHANICAL-PROPERTIES; FRACTURE-BEHAVIOR; HEAT-TREATMENT; TITANIUM; EVOLUTION; YTTRIUM; PHASE;
D O I：
10.1016/S1003-6326(19)65009-0
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The gamma-TiAl based Ti-Al-Mn-Nb alloys with different Nb additions were fabricated by selective laser melting (SLM) on the TC4 substrate. The effects of Nb content on microstructure and properties of the alloys were investigated. The results reveal that the alloys consist of gamma-TiAl phase with tetragonal lattice structure and alpha(2)-Ti3Al phase with hcp lattice structure, and show a sequential structure change from near full dendrite to near lamellar structure with the increase of Nb addition. Owing to the higher Nb content in gamma-TiAl phase and the formation of near lamellar structure, the alloy with 7.0 at.% Nb addition has the best combination of properties among the studied alloys, namely, not only a high hardness of HV 2000, a high strength of 1390 MPa and a plastic deformation of about 24.5%, but also good tribological properties and high-temperature oxidation resistance.
引用
收藏
页码：1007 / 1016
页数：10
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