采用单边缺口试样对316L不锈钢扩散连接接头进行显微疲劳试验,实现微观尺度下界面裂纹扩展和微孔隙演化的原位观测.试验观察表明:动载荷下界面裂纹扩展时,裂纹尖端晶粒内产生局部的塑性交形,但几乎观测不到界面微孔隙的扩展,也未见微孔隙与微孔隙的相连;微孔隙对界面裂纹萌生和扩展的影响不大;扩散连接过程中所形成的谷脊状界面可以改变裂纹的扩展路径.
Micro-fatigue test was performed on a single-edge notched specimen of diffusion bonded joints of 316L stainless steel in order to realize the in-situ observation of interfacial crack growth and microvoids evolu-tion on microscale. Test results show that there is no shape change in microvoids as the crack propagates under dynamic loads, and plastic deformation occurs in grains adjacent to the crack tip. No coalescence among mi-erovoids is observed during the repeated tests. Microvoids have little effect on the initiation and propagation of interfacial fatigue crack. The ridge-like interface formed in diffusion bonded joints due to surface roughness will change the crack path and can resist the growth of fatigue crack.
参考文献
| [1] | Kenji Takahashi;Mitsuo Umemoto;Naotaka Tanaka;Kazumasa Tanida;Yoshihiko Nemoto;Yoshihiro Tomita;Masamoto Tago;Manabu Bonkohara .Ultra-high-density interconnection technology of three-dimensional packaging[J].Microelectronics and reliability,2003(8):1267-1279. |
| [2] | Ghosh A;Das S;Banarjee PS;Chatterjee S .Variation in the reaction zone and its effects on the strength of diffusion bonded titanium-stainless steel couple[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(1/2):217-226. |
| [3] | J.I. Akhter;M. Ahmad;M. Iqbal .Formation of dendritic structure in the diffusion zone of the bonded Zircaloy-4 and stainless steel 316L in the presence of Ti interlayer[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2005(1/2):96-100. |
| [4] | Nishi H.;Araki T. .Low cycle fatigue strength of diffusion bonded joints of alumina dispersion-strengthened copper to stainless steel[J].Journal of Nuclear Materials: Materials Aspects of Fission and Fusion,2000(Pt.B):1234-1237. |
| [5] | 李淑欣 .扩散连接孔隙闭合模型及接头界面疲劳性能研究[D].华东理工大学,2007. |
| [6] | Tvergaard V.;Hutchinson JW. .Two mechanisms of ductile fracture: void by void growth versus multiple void interaction[J].International Journal of Solids and Structures,2002(13/14):3581-3597. |
| [7] | 江峰,张志博,张建,张敬,朱燕,孙军.纯铝/硬铝双金属界面裂纹扩展过程的SEM原位观察[J].中国有色金属学报,2005(10):1493-1499. |
| [8] | Hidetoshi Somekawa;Kenji Higashi .The Optimal Surface Roughness Condition on Diffusion Bonding[J].Materials transactions,2003(8):1640-1643. |
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