TRANSFORMATION BEHAVIOR AND SHAPE MEMORY EFFECT OF A CoAl ALLOY
This paper investigates the microstructure, martensitic transformation and shape memory effect of C0-16Al alloy. The optical micrographs of Co-16at.％Al alloy quenched from 1200℃ show that the e martensite occurs at room temperature, while some remaining y phase can also be observed. This microstructure analysis can be supported by XRD pattern. It is shown that the alloy undergoes a martensitic reverse transformation at about 220℃ during heating. However, no transformation from the fcc phase to hcp phase is detected by DSC measurement upon cooling. It is thought that the precipitation of β phase by aging at high temperature may suppress the martensitic transformation. The tension strain is 12％ and the fracture strength is above 800MPa. No obvious yield deformation is observed from the stress-strain curve. SEM images exhibits many dimples on the fracture surface, which means the fracture mechanism is ductile rupture. Bending test show that only 25％ deformation can be recovered due to shape memory effect when the pre-strain is 5％.
Shape memory alloy CoAl alloy martensitic transformation shape memory effect
FENG CHEN BING TIAN YUXIANG TONG YUFENG ZHENG
Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, Peoples Republic of China
国际会议
第五届先进材料与加工国际会议(Fifth International Conference on Advanced Materials and Processing ICAMP-5)
哈尔滨
英文
1931-1936
2008-09-03（万方平台首次上网日期，不代表论文的发表时间）