表面塑性变形对高Nb-TiAl合金扩散连接的影响<sup>*</sup>

doi:10.11901/1005.3093.2014.479

材料研究学报

2015, Vol. 29

Issue (5): 353-358 DOI: 10.11901/1005.3093.2014.479

本期目录 | 过刊浏览

表面塑性变形对高Nb-TiAl合金扩散连接的影响^*

齐先胜(

),薛祥义,唐斌,王川云,寇宏超,李金山

西北工业大学凝固技术国家重点实验室西安 710072

Influence of Surface Plastic Deformation on Diffusion Bonding of High Nb Containing TiAl Alloy

Xiansheng QI,Xiangyi XUE(

),Bin TANG,Chuanyun WANG,Hongchao KOU,Jinshan LI

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China

引用本文:

齐先胜,薛祥义,唐斌,王川云,寇宏超,李金山. 表面塑性变形对高Nb-TiAl合金扩散连接的影响^*[J]. 材料研究学报, 2015, 29(5): 353-358.
Xiansheng QI, Xiangyi XUE, Bin TANG, Chuanyun WANG, Hongchao KOU, Jinshan LI. Influence of Surface Plastic Deformation on Diffusion Bonding of High Nb Containing TiAl Alloy[J]. Chinese Journal of Materials Research, 2015, 29(5): 353-358.

全文: PDF(5054 KB) HTML

摘要:

采用高能喷丸方法在高Nb-TiAl合金表面引入塑性变形, 研究其对高Nb-TiAl合金扩散连接的影响。结果表明: 喷丸处理后待连接表面产生厚度约150 μm的变形影响区。表面变形区在扩散连接过程中未发生显著再结晶, 但是后续热处理后连接界面处发生强烈再结晶, γ相占据了原始平直界面。室温剪切强度的测试结果表明, 表面塑性变形可有效降低高Nb-TiAl合金的扩散连接温度, 连接接头的剪切强度最高达到420 MPa。

关键词 ：金属材料, 高Nb-TiAl合金, 扩散连接, 表面塑性变形, 剪切强度

Abstract：

Surface plastic deformation was applied onto a high Nb containing TiAl alloy by means of high energy shot peening (HESP), and then the influence of surface plastic deformation on diffusion bonding of the high Nb containing TiAl alloy was investigated. The results show that a deformed region with a depth of about 150 μm was produced by HESP. No recrystallization was observed in the deformed region during the bonding process. However, the bonding interface disappeared and large number of recrystallized grains was found near the bonding interface after post bonding heat treatment (PBHT) process. The results of shear test at room temperature reveal that HESP was beneficial to lower the bonding temperature and to ensure a shear strength 420 MPa for the bonding joints.

Key words： metallic materials high Nb containing TiAl alloy surface plastic deformation diffusion bonding shear strength

收稿日期: 2014-09-08

基金资助:^* 陕西省自然科学基金2014JQ6216和中央高校基本科研业务费专项资金3102014KJJD031资助。

作者简介: 薛祥义，教授

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图1 高Nb-TiAl合金的初始组织

图2 变形后试样截面的显微组织和表面的X射线衍射图谱

图3 变形表面沿厚度方向显微硬度的变化

图4 不同工艺条件下扩散连接接头的显微组织

表1 连接界面处再结晶晶粒化学成分

图5 高能喷丸后在不同工艺条件下扩散连接界面的显微组织

图6 片层扭转示意图, 包括位错分布、位错墙、小角晶界和片层扭转

图7 在1150℃-5 h条件下热处理后变形试样连接界面的显微组织

图8 扩散连接接头的剪切强度

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