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http://dx.doi.org/10.4313/TEEM.2011.12.1.28

Transformation Behavior of Ti-(45-x)Ni-5Cu-xCr (at%) (x = 0.5-2.0) Shape Memory Alloys

Im, Yeon-Min (School of Materials Science and Engineering, Gyeongsang National University)
Jeon, Young-Min (School of Materials Science and Engineering, Gyeongsang National University)
Kim, Min-Su (School of Materials Science and Engineering, Gyeongsang National University)
Lee, Yong-Hee (School of Materials Science and Engineering, Gyeongsang National University)
Kim, Min-Kyun (School of Materials Science and Engineering, Gyeongsang National University)
Nam, Tae-Hyun (School of Materials Science and Engineering, Gyeongsang National University)

Publication Information

Transactions on Electrical and Electronic Materials / v.12, no.1, 2011 , pp. 28-31 More about this Journal

Abstract

Transformation behavior and shape memory characteristics of Ti-(45-x)Ni-5Cu-xCr (x=0.5-2.0) alloys have been investigated by means of electrical resistivity measurements, differential scanning calorimetry, X-ray diffraction and thermal cycling tests under constant load. Two-stage B2-B19-B19' transformation occurred in Ti-(45-x)Ni-5Cu-xCr alloys. The B2-B19 transformation was separated clearly from the B19-B19' transformation in Ti-44.0Ni-5Cu-1.0Cr and Ti-43.5Ni-5Cu-1.5Cr alloys. A temperature range where the B19 martensite exists was expanded with increasing Cr content because decreasing rate of Ms (85 K / % Cr) was larger than that of Ms' (17 K / % Cr). Ti-(45-x)Ni-5Cu-xCr alloys were deformed in plastic manner with a fracture strain of 68% ~ 43% depending on Cr content. Substitution of Cr for Ni improves the critical stress for slip deformation in a Ti-45Ni-5Cu alloy due to solid solution hardening.

Keywords

Ti-Ni-Cu-Cr alloys; B19 martensite; Workability; Transformation behavior;

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