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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 2    April 2001

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Superelastic behavior and stabilization of stress-induced martensite
in Cu-13.4Al-4.0Ni single crystals
CHEN Qing-fu(陈庆福)1,2, ZHAO Lian-cheng(赵连城)1, R. Stalmans3, J. van Humbeeck3

1. School of Materials Science and Engineering,
Harbin Institute of Technology,Harbin 150001, P.R.China;
2. Department of Materials and Chemical Engineering,
Liaoning Institute of Technology, Jinzhou 121001, P.R.China;
3. M. T. M., K. U. Leuven, de Croylaan 2, Heverlee, Belgium, 3001

Abstract:By applying tensile stress along 〈100〉 of β phase, the superelastic behavior and stabilization of stress-induced martensite (SIM) of Cu-13.4Al-4.0Ni(mass fraction, %) single crystals were studied. The results show that the pseudo-yield stress decreases with the increase of cycling number, and keeping load isothermally has an effect on stabilization of SIM. Previous thermal cycling between (Ms-20 ℃) and (Af+20℃) promotes the superelasticity and the stabilization of SIM as well; the pre-thermal cycling also reduces the pseudo-yield stress. However, once the stabilization of SIM is produced, it can be destabilized by either the afterwards thermal cooling-heating cycling or load and immediately unload cycling in (Af~Md ). Isothermal treatment in (Af~Md ) brings restabilization of SIM. The maximum superelastic value from ββ1′(18 R ) is 9% for the studied single crystal. When test temperature is in  Af~(Af+50℃) and stress is in 0~350 MPa, the superelastic behavior exist.

 

Key words: Superelasticity; Stabilization; Stressinduced martensite; CuAlNi single crystal; Destabilization

ISSN 1672-7029
CN 43-1423/U

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