摘要
采用元素粉末Ti,Al,Cr,Nb为原料 ,通过在Ar气保护下的高温热压工艺 ,制备出了高致密度的TiAl基合金。通过光学显微术、SEM、EDAX、XRD技术分析了热等静压对材料的显微组织和相成分的影响。结果表明 ,在12 0 0℃和 130 0℃下分别热压 1h后可以得到显微组织细小的TiAl基合金 ,Cr元素的分布比较均匀 ,但是存在一些Nb元素的扩散不完全现象。
Under the protection of Ar, high density TiAl-based alloy has been prepared by hot pressing with elemental Ti, Al, Cr and Nb powders at elevated temperature. The microstructure and the phase composition of the alloy are analyzed through optical microscopy, SEM, EDAX and XRD techniques. Results show that TiAl-based alloy with fine microstructure can be obtained by hot pressing at 1300°C or 1200°C respectively for 1 h. The distribution of Cr element is very homogeneous. However, the incomplete diffusion of Nb element remains in the microstructure. Through subsequent isostatic hot pressing (HIP), the material density can also be increased and the distribution homogeneity of alloy elements can be improved further.
出处
《粉末冶金技术》
EI
CAS
CSCD
北大核心
2001年第3期165-169,共5页
Powder Metallurgy Technology
基金
国家 8 6 3高技术基金
国家自然科学基金重大项目支助
