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HIGH TEMPERATURE OXIDATION OF TiNi-Pb SHAPE MEMORY ALLOYS

TIAN Qing-chao, CHEN Jia-guang (Testing Center, R & D Center, Bao Shan Steel & Iron Co. Ld., Shanghai 201900, China) Chen Yi-feng, WU Jian-sheng (School of Materials Science & Engineering, Shanghai Jiaotong University, Shanghai 200030, China)  
The high temperature oxidation behaviors of TiNi-Pd series alloys, i.e. TiNi?TiNiPd and TiNiPd(Ce) shape memory alloys, have been investigated by using X-Ray diffractometer, scanning electron microscope and electron probe micro analyzer. The oxidation scale exhibits multi-layer structure and the surface layer consists of rutile TiO 2. TiNi scale shows two layers while TiNiPd four and TiNiPd(Ce) five. After oxidation, there is a slight Ti loss on the surface matrix of TiNi alloy, while the Ti loss on the same place of both TiNiPd and TiNiPd(Ce) is significant, and a linear decrease of microhardness from the surface to the inner part of the alloy was observed.
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