Characterization of NiTi Shape Memory Alloy Sintered at Different Temperatures in Reducing Environment

材料科学 钛镍合金 形状记忆合金 烧结 生物相容性 杂质 扫描电子显微镜 冶金 相(物质) 合金 无扩散变换 化学工程 差示扫描量热法 粉末冶金 微观结构 马氏体 复合材料 热力学 有机化学 化学 工程类 物理
作者
Hafizah Hanim Mohd Zaki,Nur Azemuzahir Mohd Sobri,Jamaluddin Abdullah,Norshahida Sariffudin,Farah Diana Mohd Daud
出处
期刊:Materials Science Forum 卷期号:1010: 632-637
标识
DOI:10.4028/www.scientific.net/msf.1010.632
摘要

NiTi has received significant interest as medical implant materials due to its shape memory effect behavior apart from its good biocompatibility and mechanical properties. The formidable challenge of obtaining single phase NiTi from elemental powders via solid state is due to oxidation problem of elemental powders and the oxygen atoms dissolve in NiTi matrix as interstitial impurities forming stable oxygen-rich TiNiOx. This may deterioriate the shape memory behavior of NiTi. This research investigates the use of MgH 2 in combination with CaH 2 as in-situ reducing agent to eliminate oxidation of the specimen during sintering both at lower and higher sintering temperatures. Here, the effect of sintering temperature on phase formation and transformation behavior of NiTi in reducing environment was studied. The phase formation was characterized by using x-ray diffraction (XRD) where the morphology and elemental analysis were characterized by using the scanning electron microscope (SEM) equipped with EDS. The martensitic transformation behavior was analyzed using differential scanning calorimeter (DSC). The use of MgH 2 and CaH 2 as reducing agent has a significant influence on the phase formation of NiTi synthesized via solid state especially at 930 °C, where almost single phase NiTi was formed with good transformation behavior. This reducing agent creates a conducive environment for the production of single phase NiTi.
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