Microstructure and mechanical properties of Ti-43Al-9V alloy fabricated by spark plasma sintering

被引：14
作者：
Xu Li-juan [1 ,2 ]
Xiao Shu-long [1 ,2 ]
Chen Yu-yong [1 ,2 ]
Wang Juan [1 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2012年 / 22卷 / 04期
基金：
中国国家自然科学基金;
关键词：
TiAl alloy; mechanical alloying; spark plasma sintering; microstructure; mechanical properties; OXIDATION BEHAVIOR; POWDERS;
D O I：
10.1016/S1003-6326(11)61243-0
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
A fine-grained TiAl alloy with the composition of Ti-43Al-9V was prepared by mechanical milling and spark plasma sintering (SPS). The relationship among sintering temperature, microstructure and mechanical properties was studied. The results show that the morphology of mechanical milling powder is regular with size in a range of 5-30 mu m. Main phases of gamma-TiAl, alpha(2)-Ti3Al and few B-2 phase are observed in the SPS bulk samples. For samples sintered at 1150 C, equiaxed crystal grain microstructure is achieved with size in a range of 300 nm-1 mu m. With increasing SPS temperature to 1250 C, the size of equiaxed crystal grains obviously increases, the microhardness decreases from HV592 to HV535, and the bending strength decreases from 605 to 219 MPa. Meantime, the compression fracture strength also decreases from 2601 to 1905 MPa, and the strain compression decreases from 28.95% to 12.09%.
引用
收藏
页码：768 / 772
页数：5
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