Microstructure, mechanical properties and shape memory effect of Cu–Hf–Al–Ni alloys. Issue 12 (13th August 2018)

• Record Type: Journal Article
• Authors: Zhang, Xin; Zhao, Xu; Wang, Fang; Liu, Qingsuo; Wang, Qian
• Is Part Of: Materials science and technology. Volume 34:Issue 12(2018)
• Page Start: 1497
• Page End: 1501
• Publication Date: 2018-08-13
• Subjects: High-temperature shape memory alloys -- shape memory effect -- Cu–Al–Ni alloy; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2018.1462299
• Languages: English
• ISSNs: 0267-0836

Abstract

ABSTRACT: The influence of hafnium element's incorporation on a Cu– x Hf–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– x Hf–13.0Al–4.0Ni ( x = 0.5, 1.0 and 2.0) alloys is 18R martensite, and an orthorhombic-structured Cu8 Hf3 phase is formed and distributed at the grain boundaries. The grain size is significantly reduced with increasing Hf content. The mechanical properties of Cu– x Hf–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.