[001] 取向 DD100 单晶合金高温慢拉伸断裂行为研究  

TENSILE FRACTURE BEHAVIOUR OF SINGLE CRYSTAL ORIENTATION DD100 AT SLOW STRAIN RATE AT HIGH TEMPERATURE

作　　者：周灿栋[1] 董显平[1] 郁金星[1] 张源虎[1] 袁福河[2] 周龙江[2] 李铁藩[2] 孙传棋[3] 李其娟[3] 吴昌新[3] 刘泽尧[3] 

机构地区：[1]上海交通大学 [2]中国科学院金属腐蚀与防护研究所 [3]北京航空材料研究院

出　　处：《航空材料学报》1998年第1期15-22,共8页Journal of Aeronautical Materials

基　　金：金属腐蚀与防护国家重点实验室资助项目

摘　　要：通过对单晶［００１］取向的慢拉伸断裂行为研究发现，与真空中相比，空气中氧对单晶７６０℃温度下慢拉伸性能以及８５０℃温度下慢拉伸强度影响不大，但使８５０℃时单晶的延性下降；氧的存在不影响单晶的断裂方式，而改变单晶拉伸试样表面裂纹的扩展；空气中慢拉伸断口的主裂纹源位于断口边缘，而真空中主裂纹源则位于断口中间部位；无论是真空还是空气中，慢拉伸断裂为多源开裂，断口中存在（００１）方形结晶面包围的孔洞。An investigation has been made of tensile fracture behavior of single crystal orientation DD100 at slow strain at high temperature.Oxygen in air has little influence on the properties of DD100 at 760℃ and the strengths of DD100 at 850℃,but it made the tensile elongation of DD100 reduce at 850℃ as compared with it in vacuum.Oxygen did not affect the fracture of DD100 but strongly influenced the propagation of the crack at the specimen surface.The main crack sources lied in the margin of fracture surface in air and were situated in the middle region of fracture surface in vacuum.Both in vacuum and in air,the tensile fractures of DD100 have many holes surrounded by square facets.

关 键 词：高温慢拉伸 环境影响 断裂 高温合金 单晶 

分 类 号：TG132.32[一般工业技术—材料科学与工程]