摘要
对经TiB2 (体积分数ω =0 .8% )颗粒细化后Ti-4 5Al-2Mn -2Nb合金进行了激光表面快速熔凝处理 ,在其表面获得了超细晶粒组织 ,并在T =1 0 73～ 1 2 2 3K ,P =40～ 1 2 0MPa ,t=0 .5～ 1h条件下对经激光处理后的合金进行了超塑扩散连接 ,研究了温度、压强和时间对连接过程的影响 ,建立相应的理论模型对连接过程进行了模拟 .研究结果表明 ,在晶粒度和表面粗糙度一定的条件下 ,温度、压强和时间对连接过程产生重要影响 ,而且三者之间存在一定的关系 ;经过激光表面处理后的合金试样在较低温度、较低压力和较短时间下 (1 1 73K/ 6 0MPa/ 1h)可达到完全冶金结合 ;
An alloy of Ti-45Al-2Mn-2Nb+0.8 %TiB_(2)(ω_(TiB_2)) was surface-treated by laser rapid solidification, and a fine microstructure was obtained on the surface of this alloy. The superplastic forming/diffusion bonding(SF/DB) method was used to the bonding of the alloy under the condition of T=1 073～1 223 K, P=40～120 MPa and t=0.5～1 h. The influence of temperature, pressure and time on the quality of bonding were investigated, and a modelling of SF/DB was put forward. The results indicated that the quality of SF/DB for TiAl alloy is dependent on temperature, pressure and time, and under the condition of lower temperature and pressure and shorter time(e.g. 1 173 K/60 MPa/1 h), sound SPF/DB could be obtained in the alloy treated by laser surface treatment. The calculation results based on the modelling are consistent with the experimental results.
出处
《湘潭大学自然科学学报》
CAS
CSCD
2004年第4期57-62,共6页
Natural Science Journal of Xiangtan University
基金
国家自然科学基金资助项目 (5 0 371 0 72 )
关键词
TIAL基合金
超塑扩散焊接
显微组织
数学模拟
TiAl based alloy
Superplastic forming/Diffusion bonding
Microstructure
Mathematics simulation
