Microstructure, mechanical properties and shape memory effect of Cu-Hf-Al-Ni alloys

作者：Zhang, Xin^*; Zhao, Xu; Wang, Fang; Liu, Qingsuo^*; Wang, Qian

来源：Materials Science and Technology, 2018, 34(12): 1497-1501.

DOI：10.1080/02670836.2018.1462299

• High-temperature shape memory alloys
• shape memory effect
• Cu-Al-Ni alloy

The influence of hafnium element's incorporation on a Cu-xHf-13.0Al-4.0Ni (wt-%) (x = 0.5, 1.0 and 2.0) high-temperature shape memory alloy was investigated systematically. The results show that the matrix of Cu-xHf-13.0Al-4.0Ni (x = 0.5, 1.0 and 2.0) alloys is 18R martensite, and an orthorhombic-structured Cu8Hf3 phase is formed and distributed at the grain boundaries. The grain size is significantly reduced with increasing Hf content. The mechanical properties of Cu-xHf-13.0Al-4.0Ni (x = 0.5, 1.0 and 2.0) alloys are improved by Hf doping due to the combination of refinement strengthening, solid solution strengthening and second phase strengthening. After heating under pre-strain of 10%, the shape memory effect of the Cu-1.0Hf-13.0Al-4.0Ni alloy reaches 5.6%, which is obviously higher than that of the Cu-13.0Al-4.0Ni alloy.

• 出版日期2018
• 单位天津理工大学