Effect of Sm Doping on the Microstructure, Mechanical Properties and Shape Memory Effect of Cu-13.0Al-4.0Ni Alloy

• Published in: Materials Vol. 14; no. 14; p. 4007
• Main Authors: Zhang, Qimeng, Cui, Bo, Sun, Bin, Zhang, Xin, Dong, Zhizhong, Liu, Qingsuo, Cui, Tianyu
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 17.07.2021; MDPI
• Subjects: Alloys; Compressive properties; Copper base alloys; Cu-Al-Ni; Grain size; Heat resistant alloys; High temperature; high temperature shape memory alloy; Mechanical properties; mechanical property; Microstructure; Phase transitions; Powder metallurgy; Rare earth elements; Reagents; Room temperature; Samarium; Shape effects; Shape memory alloys; shape memory effect; Beijing China; China
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma14144007

The effects of rare earth element Sm on the microstructure, mechanical properties, and shape memory effect of the high temperature shape memory alloy, Cu-13.0Al-4.0Ni-xSm (x = 0, 0.2 and 0.5) (wt.%), are studied in this work. The results show that the Sm addition reduces the grain size of the Cu-13.0Al-4.0Ni alloy from millimeters to hundreds of microns. The microstructure of the Cu-13.0Al-4.0Ni-xSm alloys are composed of 18R and a face-centered cubic Sm-rich phase at room temperature. In addition, because the addition of the Sm element enhances the fine-grain strengthening effect, the mechanical properties and the shape memory effect of the Cu-13.0Al-4.0Ni alloy were greatly improved. When x = 0.5, the compressive fracture stress and the compressive fracture strain increased from 580 MPa, 10.5% to 1021 MPa, 14.8%, respectively. When the pre-strain is 10%, a reversible strain of 6.3% can be obtained for the Cu-13.0Al-4.0Ni-0.2Sm alloy.