Effect of Fe and Mo additions on microstructure and mechanical properties of TiAl intermetallics  

Fe和Mo元素对TiAl金属间化合物显微组织和性能的影响(英文)

作　　者：邱从章[1] 刘咏[1] 黄岚[1] 张伟[1] 刘彬[1] 卢斌[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第3期521-527,共7页中国有色金属学报（英文版）

基　　金：Project(2011CB605505) supported by the National Basic Research Program of China;Project(2011JQ002) supported by the Fundamental Research Funds for the Central Universities,China;Project supported by the Open-End Fund for the Valuable and Precision Instruments of Cental South University,China

摘　　要：The ductility of TiAl intermetallics can be improved through stabilizing the ductile β phase.New β-stabilized Ti-45Al-xFe-yMo（x,y=1,2,3,4） alloys were designed through adding the β stabilizing elements Fe and Mo.The microstructural evolution and deformation behavior of the Ti-45Al-xFe-yMo alloys were investigated.The results show that the amount of β（B2） phase is increased with the increase of alloying elements.Mo shows a higher capability for stabilizing the β phase than Fe.In the optimized Ti-45Al-3Fe-2Mo alloy,the grains are significantly refined to about 12 μm,and this alloy shows a very good hot ductility at the elevated temperature.β相可以提高TiAl金属间化合物的塑性。通过显微组织分析和变形行为的评估研究β稳定性元素Fe和Mo对Ti-45Al-xFe-yMo(x,y=1,2,3,4)合金的影响。结果表明:合金中的B2(β)相随着Fe和Mo元素含量的增加而增多,Mo表现出强的β稳定性。加入3%Fe和2%Mo后,合金的晶粒得到细化,其尺寸达到12-m。由于具有一定量的β相,细化后的Ti-45Al-3Fe-2Mo合金在790℃具有良好的塑性。

关 键 词：TiAl intermetallics FE MO β phase grain refinement 

分 类 号：TG146.23[一般工业技术—材料科学与工程]