放电等离子烧结快速制备致密Ti-Al基合金  

Fabrication of Dense Ti-Al-based Alloy by Spark Plasma Sintering

作　　者：路新[1] 何新波[1] 曲选辉[1] 李世琼[2] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]钢铁研究总院高温材料研究所,北京100081

出　　处：《金属热处理》2007年第2期20-22,共3页Heat Treatment of Metals

基　　金：高等学校科技创新工程重大项目资助(704008);新世纪优秀人才项目资助(NCET-04-01017)

摘　　要：以Ti-47.5A l-2.5V-1.0Cr合金粉末为原料,研究了采用放电等离子烧结工艺制备Ti-A l基合金。研究表明,当烧结温度高于1100℃时,可制备出致密度高、组织均匀的Ti-A l基合金;烧结温度对合金的显微组织影响显著,在1100℃和1150℃烧结,得到由等轴γ晶粒与α2+γ片层束构成双态组织,在1200℃烧结时,得到全部由α2+γ片层束构成的全片层组织;当烧结温度为1100℃时,具有细小双态组织的合金具有较佳的室温力学性能,其抗压强度为3321 MPa,压缩率为35.2%。Ti-Al alloys from prealloyed powder of Ti-47.5Al-2. 5V-1.0Cr were prepared by spark plasma sintering （SPS）. The results show that Ti-Al-based alloy with higher density and uniform microstructure is obtained by SPS at sintering temperature of 1100℃ or above. However, the microstructures of the alloy change with the sintering temperature variation. While sintered at ll00℃ and 1150℃ ,they consist of equiaxed （γ） and lamellar （α2 ＋ γ） grains;sintered at 1200℃, they are of fully lamellar microstructure. The alloys sintered at 1100℃ with fine duplex microstructure exhibit better compressive properties at room temperature,with the compressive strength of 3321 MPa and the compression ratio of 35.2%.

关 键 词：TI-AL基合金 放电等离子烧结 显微组织 力学性能 

分 类 号：TG115.6[金属学及工艺—物理冶金]