摘要
以Ti、Al等元素粉末为原料,采用快速烧结方法和无包套锻造法制备尺寸为Ф50×10 mm的TiAl合金锻坯.快速烧结后,TiAl合金由TiAl、Ti3Al、B2、Ti和TiAl3相组成,并且该合金存在较多的孔隙,孔隙主要由偏扩散造成的;经过高温锻造后,其孔隙得到了有效的控制,相对密度达到93%;经过热处理后,该合金主要由TiAl和Ti3Al相组成,在室温下合金的屈服强度提高了110 MPa,达到480 MPa,室温延伸率到达0.83%;在700℃和750℃,其屈服强度分别为580 MPa和530 MPa,其延伸率分别为12%和27%.
TiAl based alloy was fabricated by rapid sintering and open - die forging using elemental metallurgy. The result show that, after rapid sintering, the alloy with many pores is composed of TiA1, Ti3A1, B2, Ti and TiAl3 phases, and the reason of the exiting pores is A1 self - diffusion in the process of sintering. The relative density could be increased effectively by forging to 93 %. After heat treatment, the alloy composed of TiA1 and Ti3A1 phases has excellent properties, the yield strength at room temperature increases by about 110MPa and reaches 480MPa, and the ductility increases to 0.83%. At 700℃ and 750℃, the yield strengths are 580MPa and 530MPa, and the ductilities are 12% and 27% , respectively
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2013年第4期84-88,共5页
Materials Science and Technology
基金
国家自然科学基金资助(51074058)
关键词
TIAL合金
元素粉末
锻造
组织
性能
TiA1 based alloy
elemental powder
forging
microstructure
properties
