Enhanced superelasticity of Cu<strong>‒</strong>Al<strong>‒</strong>Ni shape memory alloys with strong orientation prepared by horizontal continuous casting

doi:10.1007/s11706-022-0616-6

Front. Mater. Sci.

2022, Vol. 16

Issue (4) : 220616 https://doi.org/10.1007/s11706-022-0616-6

RESEARCH ARTICLE

Enhanced superelasticity of Cu‒Al‒Ni shape memory alloys with strong orientation prepared by horizontal continuous casting

Mengwei WU¹, Yu XIAO², Zhuofan HU¹, Ruiping LIU¹(

), Chunmei MA²(

)

¹. Department of Materials Science and Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
². Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

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Abstract

The preparation of large-scale Cu‒Al‒Ni shape memory alloys with excellent microstructure and texture is a significant challenge in this field. In this study, large-scale Cu‒Al‒Ni shape memory alloy (SMA) slabs with good surface quality and strong orientation were prepared by the horizontal continuous casting (HCC). The microstructure and mechanical properties were compared with the ordinary casting (OC) Cu‒Al‒Ni alloy. The results showed that the microstructure of OC Cu‒Al‒Ni alloy was equiaxed grains with randomly orientation, which had no obvious superelasticity. The alloys produced by HCC had herringbone grains with strong orientation near〈1 0 0〉and the cumulative tensile superelasticity of 4.58%. The superelasticity of the alloy produced by HCC has been improved by 4‒5 times. This work has preliminarily realized the production of large-scale Cu‒Al‒Ni SMA slab with good superelasticity, which lays a foundation for expanding the industrial production and application of Cu-based SMAs.

Keywords shape memory alloy Cu‒Al‒Ni orientation superelasticity

Corresponding Author(s): Ruiping LIU,Chunmei MA

About author:

Tongcan Cui and Yizhe Hou contributed equally to this work.

Issue Date: 19 October 2022

Cite this article:

Mengwei WU,Yu XIAO,Zhuofan HU, et al. Enhanced superelasticity of Cu‒Al‒Ni shape memory alloys with strong orientation prepared by horizontal continuous casting[J]. Front. Mater. Sci., 2022, 16(4): 220616.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-022-0616-6
https://academic.hep.com.cn/foms/EN/Y2022/V16/I4/220616

Fig.1 The OC Cu?Al?Ni alloy: (a) simple diagram, (b) macrostructure, and (c) microstructure. The HCC Cu?Al?Ni alloy slab: (d) simple diagram, (e) macrostructure, and (f) microstructure.

Fig.2 (a) Microstructure and (b) grain orientation of Cu?Al?Ni alloy prepared by OC. (c) Microstructure and (d) grain orientation of Cu?Al?Ni alloy prepared by HCC.

Fig.3 Microstructure of HCC-CAN alloy longitudinal section after different heat treatment conditions: (a) 800 °C + oil quenching; (b) 900 °C + oil quenching; (c) 1000 °C + oil quenching; (d) 800 °C + water quenching; (e) 900 °C + water quenching; (f) 1000 °C + water quenching; (g) 800 °C + brine quenching; (h) 900 °C + brine quenching; (i) 1000 °C + brine quenching.

Fig.4 Microstructure of HCC-CAN alloy brine quenched longitudinal section kept 900 °C for 1 h heat treatment.

Fig.5 DSC curves of the HCC-CAN alloy after heat treatment at different temperatures for 1 h: (a) 800 °C; (b) 900 °C; (c) 1000 °C.

Tab.1 Phase transformation temperature, thermal hysteresis and equilibrium temperature of water quenched and brine quenched HCC-CAN alloys at different temperatures

Fig.6 Superelastic tensile stress?strain curves of the Cu?Al?Ni alloy with different strain amplitudes of 1%, 2%, 4%, and 6%: (a) OC-CAN alloy; (b) HCC-CAN alloy.

Fig.7 Cyclic stress?strain curves of the Cu?Al?Ni alloy under different cyclic strains of (a) 1% and (b) 2.5%.

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