表面纳米化对钛合金与钛铝合金扩散连接影响的研究
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摘要
通过喷丸处理在TC11钛合金表层获得纳米晶,分别对TiAl合金与TC11钛合金、表面纳米化TC11钛合金在不同连接温度下进行扩散连接。利用透射电镜、扫描电镜、电子探针进行组织与元素分析,测试接头的剪切强度。实验结果表明,经过喷丸后TC11钛合金在表层获得厚度为20μm的纳米晶。表面纳米化处理有利于促进扩散中间层的增长,降低最佳扩散连接温度。扩散中间层的厚度对接头剪切强度与断裂方式有较大的影响。钛合金经表面纳米化后,扩散中间层厚度为1.7μm时,剪切强度最高。
The nanocrystallites were obtained by shot peening on the surface of TC11 titanium alloy. The diffusion bonding of TiAl with TC11 alloy, TC11 alloy after surface nanocrystallization was carried out. The microstructure and element were analyzed by using TEM, SEM, and EPMA and the shear strength was tested. The results show that after shot peening,nanocrystalline with a thickness of 20 μm is obtained on the surface layer. The surface nanocrystallization treatment accelerates the growth of diffusion intermediate layer and decreases the optimal bonding temperature. Moreover, the diffusion intermediate layer thickness plays an important role on shear strength and fracture mode. After the surface nanocrystallization of titanium alloy, the maximum shear strength of joint appears when the thickness of intermediate layer is 1.7 μm.
The nanocrystallites were obtained by shot peening on the surface of TC11 titanium alloy. The diffusion bonding of TiAl with TC11 alloy, TC11 alloy after surface nanocrystallization was carried out. The microstructure and element were analyzed by using TEM, SEM, and EPMA and the shear strength was tested. The results show that after shot peening,nanocrystalline with a thickness of 20 μm is obtained on the surface layer. The surface nanocrystallization treatment accelerates the growth of diffusion intermediate layer and decreases the optimal bonding temperature. Moreover, the diffusion intermediate layer thickness plays an important role on shear strength and fracture mode. After the surface nanocrystallization of titanium alloy, the maximum shear strength of joint appears when the thickness of intermediate layer is 1.7 μm.
引文
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[2]闫藴琪,王文生,张振琪,等.高Nb-TiAl基合金的开坯锻造[J].热加工工艺,2000,29(1):32-33.
[3]Li H,Yang C,Sun L,et al.Hot press bonding ofγ-TiAl and TC17 at a low bonding temperature by imposing plastic deformation and post heating[J].Materials Letters,2017,187:4-6.
[4]Wang X R,Yang Y Q,Luo X,et al.An investigation of Ti-43Al-9V/Ti-6Al-4V interface by diffusion bonding[J].Intermetallics,2013,36:127-132.
[5]Wang X F,Ma M,Liu X B,et al.Interface characteristics in diffusion bonding of aγ-TiAl alloy to Ti-6Al-4V[J].Journal of Materials Science,2007,42(11):4004-4008.
[6]张广兰,姚权桐,佟伟平.表面纳米化预处理对Ti-6Al-4V合金渗硼的影响[J].材料热处理学报,2017(10):93-99.
[7]Liu Y G,Li H M,Li M Q.Characterization of surface layer in TC17 alloy treated by air blast shot peening[J].Materials&Design,2015,65:120-126.
[8]司玉峰,陈子勇,孟丽华,等.Ti3Al基金属间化合物的研究进展[J].特种铸造及有色合金,2003(4):33-35.
[9]Cam G,Ozdemir U,Ventzke V,et al.Microstructural and mechanical characterization of diffusion bonded hybrid joints[J].Journal of Materials Science,2008,43(10):3491-3499.