The sintering densification, microstructure and mechanical properties of gamma Ti-48Al-2Cr-2Nb alloy with a small addition of copper

被引：38
作者：
Xia, Y. [1 ]
Luo, S. D. [1 ]
Wu, X. [2 ]
Schaffer, G. B. [1 ]
Qian, M. [1 ]
机构：
[1] Univ Queensland, Sch Mech & Min Engn, ARC Ctr Excellence Design Light Met, Brisbane, Qld 4072, Australia
[2] Univ Melbourne, Dept Mech Engn, ARC Ctr Excellence Design Light Met, Parkville, Vic 3010, Australia
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 559卷
基金：
澳大利亚研究理事会;
关键词：
Sintering; Titanium aluminide; Copper; Mechanical properties; TITANIUM ALUMINIDES; TIAL ALLOYS; TEMPERATURE; INTERMETALLICS; DEFORMATION; DUCTILITY; BEHAVIOR;
D O I：
10.1016/j.msea.2012.08.100
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Titanium aluminide based alloys are difficult to consolidate by pressureless sintering. A systematic study has been made of the effect of small additions of copper on the sintering densification, microstructure and mechanical properties of gamma Ti-48Al-2Cr-2Nb (in at% throughout). The density of the Ti-48Al-2Cr-2Nb alloy sintered at 1375 degrees C for 120 min increased consistently from 74% theoretical density (TD) without Cu to > 98%TD with an addition of up to 2 at%Cu. The enabling effect of a small addition of Cu is due to the formation of a wetting liquid, supported by dilatometry, differential scanning calorimetry (DSC) and Thermal-Calc analyses. Rapid sintering shrinkage occurred around 1251 degrees C and 1370 degrees C corresponding to liquid formation. Transmission electron microscopy (TEM) identified the formation of a Cu- and Cr-enriched hexagonal close-packed Ti(Al, Cr, Cu, Nb) phase with a=0.520 angstrom and c=0.803 angstrom. Its presence increased with increasing Cu content. The compressive, tensile and flexure properties of the as-sintered Ti-48Al-2Cr-2Nb-2Cu alloy were assessed. The tensile properties are similar or superior to those of the Ti-48Al-2Cr-2Nb alloy fabricated by metal injection moulding and sintering while the compression strength is about twice that of the as-cast Ti-48Al-2Cr-2Nb. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：293 / 300
页数：8
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