超塑性固相焊焊接面断口的分形探讨  

Fractal Exploration of the Welded Surface Fracture of Superplastic Solid-State Welding

作　　者：张柯柯[1] 杨蕴林[1] 倪峰[1] 王再友[2] 祝要民[2] 薛锦[3] 

机构地区：[1]河南科技大学材料科学与工程系,洛阳471003 [2]西安交通大学材料科学与工程学院 [3]西安交通大学机械工程学院

出　　处：《西安交通大学学报》2002年第11期1173-1176,共4页Journal of Xi'an Jiaotong University

基　　金：河南省自然科学基金资助项目(9840 40 90 0 ) ;激光技术国家重点实验室开放基金资助项目 ([2 0 0 1]0 110 )

摘　　要：以恒温超塑焊焊接面断口为研究对象 ,采用二次电子衬度曲线法表述焊接面断口的分形维数 ,探讨了用分形维数来描述焊接面断口各区焊合特征的可能性 .试验结果表明 ,由于焊接面断口各区焊合状态的不同 ,对应的分形维数也不同 .当测量尺码在 1～ 4 μm的范围内时 ,分形维数可以完全作为反映焊合微观状态的特征参量 ,因此用分形来描述超塑性固相焊焊接面断口各区的焊合特征是可行的 .这也从分形理论的角度证明了在超塑性固相焊接头的形成过程中 ,焊接面各微区的焊合状态是非均匀性的 .Taking the welded surface fracture of isothermal superplastic solid-state welding as a research object, and considering the fractal dimension of the fracture being described by secondary electron intensity, the possibility of describing the welded state of every micro zone at welded surface is discussed by using fractal dimension. The experimental results indicate that the fractal dimension varies with the welded state of every micro zone at welded surface. Within the extent of scale 1-4 micron, it is reasonable that the fractal is used to describe the characteristic parameter of the welded state of every micro zone at the fracture surface, so the possibility does exist. It is proved by the fractal theory that the welded state of every micro zone at welded surface is uneven in the formation process of isothermal superplastic solid-state welding joint.

关 键 词：超塑性固相焊 焊接面断口 分形维数 焊合特征 焊合状态 固相连接 

分 类 号：TG456.9[金属学及工艺—焊接]