Constitutive behavior of Ni-Ti shape memory alloy under hot compression
来源期刊：中南大学学报(英文版)2013年第1期
论文作者：JIANG Shu-yong (江树勇) ZHANG Yan-qiu (张艳秋) ZHAO Ya-nan (赵亚楠) Tang Ming (唐明) Yi Wen-lin (易文林)
文章页码：24 - 29
Key words：Ni-Ti alloy; shape memory alloy; constitutive behavior; microstructural evolution; hot deformation
Abstract: Constitutive behavior of nickel-titanium shape memory alloy (Ni-Ti SMA) under hot deformation was investigated by means of the compression tests and the linear fitting method. Based on the true stress-strain curves of Ni-Ti SMA under compression at the strain rates of 0.001-1 s-1 and at the temperatures ranging from 600 to 1 000 ºC, the constitutive equation of Ni-Ti SMA with respect to the Zener-Hollomon parameter was established according to the high stress level and the low stress level at various temperatures so as to more accurately describe the deformation behavior of Ni-Ti SMA during hot working. Dynamic recovery and dynamic recrystallization of Ni-Ti SMA occur under hot compression, which lays the theoretical foundation for understanding the constitutive behavior of Ni-Ti SMA.
JIANG Shu-yong (江树勇)1 , ZHANG Yan-qiu (张艳秋)1, ZHAO Ya-nan (赵亚楠), Tang Ming (唐明)1, Yi Wen-lin (易文林)2
(1. Industrial Training Centre, Harbin Engineering University, Harbin 150001, China;
2. College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China)
Abstract:Constitutive behavior of nickel-titanium shape memory alloy (Ni-Ti SMA) under hot deformation was investigated by means of the compression tests and the linear fitting method. Based on the true stress-strain curves of Ni-Ti SMA under compression at the strain rates of 0.001-1 s-1 and at the temperatures ranging from 600 to 1 000 ºC, the constitutive equation of Ni-Ti SMA with respect to the Zener-Hollomon parameter was established according to the high stress level and the low stress level at various temperatures so as to more accurately describe the deformation behavior of Ni-Ti SMA during hot working. Dynamic recovery and dynamic recrystallization of Ni-Ti SMA occur under hot compression, which lays the theoretical foundation for understanding the constitutive behavior of Ni-Ti SMA.
Key words:Ni-Ti alloy; shape memory alloy; constitutive behavior; microstructural evolution; hot deformation
