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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 6    December 2005

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R-phase transformation of aged Ti-Ni shape memory alloy
GONG Chang-wei(宫长伟), WANG Yi-nong(王轶农), 
YANG Da-zhi(杨大智), LIU Xiao-peng(刘晓鹏) 

Department of Materials Engineering, Dalian University of Technology, 
Dalian 116024, China

Abstract: Ti-50.6Ni(molar fraction, %) shape memory alloy solution treated at 850℃ for 1h followed by ageing treatment at 450℃ for 3h was studied with differential scanning calorimetry(DSC), X-ray diffractometry(XRD) and transmission electron microscopy(TEM). DSC measurement reveals two separate transformation peaks. XRD and TEM demonstrate that a three-stage transformation occurs. The Ti3Ni4 precipitates are coherent with the R-phase. The crystal structure of R-phase was analyzed by two diffraction patterns method. The diffraction patterns of R-phase were obtained in detail from the same region.

 

Key words:  Ti-Ni shape memory alloys; R-phase transformation; Ti3Ni4 precipitates

ISSN 1672-7029
CN 43-1423/U

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