EFFECT OF HEAT TREATMENT ON TRANSFORMATION BEHAVIOR OF LOW-TEMPERATURE SUPERELASTICITY ALLOY Ti-50.8Ni-0.3Cr
Received date: 2009-08-24
Revised date: 2009-11-29
Online published: 2010-03-11
Supported by
Supported by Natural Science Foundation of Shaanxi Province (No.2009JM6010) and Special Scientific esearch program Founded by Shaanxi Provicial Education epartment (No.09JK375)
The effects of annealing and aging processes on transformation behavior of the low-temperature superelasticity alloy Ti-50.8Ni-0.3Cr (atomic fraction, %) were investigated with differential scanning calorimetry. The A→R/R→A (A-parent phase, R-R phase) type reversible transformation occurred in the 350-450 ℃ annealed alloy upon cooling/heating, the A→R→M/M→R→A (M-martensite) type occurred in the 500 ℃ annealed alloy, the A→R→M/M→A type occurred in 550-600 ℃ annealed alloy, and no transformation occurred in the above 650 ℃ annealed alloy. The effect of the annealing time on transformation behavior of the alloy is not serious. With increasing aging time tag, the transformation type of 300 ℃ aged alloy still is A→R/R→A, the one of 400 ℃ aged alloy changes from A→R/R→A to A→R→M/M→R→A, and the one of 500 ℃ aged alloy changes from A→R→M / M→R→A to A→R→M/M→A. With increasing annealing temperature, the R transformation temperature (δR) of the alloy increases first and then decreases, the M transformation temperature (δM) increases, and the M temperature hysteresise (ΔδM) decreases. After aging at 300-500 ℃, the δR400>δR300>δR500. With increasing tag, the δR and δM increase fast first and then tend to stable, and the ΔδM decreases fast first and then tends to stable. The R temperature hysteresises in both the annealed and aged alloys are about 4 ℃.
Key words： Ti-50.8Ni-0.3Cr alloy; hape memory effect; uperelasticity; ransformation
HE Zhi-Rong , YU Fang , YU Yong-Shan . EFFECT OF HEAT TREATMENT ON TRANSFORMATION BEHAVIOR OF LOW-TEMPERATURE SUPERELASTICITY ALLOY Ti-50.8Ni-0.3Cr[J]. Acta Metall Sin, 2010 , 46(3) : 329 -333 . DOI: 10.3724/SP.J.1037.2009.00554
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