High-temperature microstructural characteristics of a novel biomedical titanium alloy
High-temperature microstructural characteristics of a novel biomedical titanium alloy
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DOI：
10.1016/j.jallcom.2010.03.052
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发表时间：
2010-06
影响因子：
6.2
通讯作者：
Ming-Chih Chang;C. W. Luo;Mao-Suan Huang;K. Ou;Li Hsiang Lin;H. Cheng
中科院分区：
文献类型：
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作者：
Ming-Chih Chang;C. W. Luo;Mao-Suan Huang;K. Ou;Li Hsiang Lin;H. Cheng
在本研究中，通过光学显微镜、扫描电子显微镜、透射电子显微镜和能量色散 X 射线光谱法测定了 Ti-5Al-1Sn-1Fe-1Cr (Ti-5111) 合金的高温微观结构特征。在800~1000℃固溶处理过程中，合金的相变顺序为(α+β)→(α+α′+β)→(α+α′+α″+残余β)→(α′+β)。残余的β相随后在淬火过程中转变为α”相。这种转变的驱动力是冷却速率。 Ti-5111合金的马氏体起始点(Ms)和β相变温度分别接近860和960°C。这些值低于 Ti-6Al-4V 合金的值。此外，人们认为α'马氏体中Al的浓度对于孪晶马氏体的形成起着至关重要的作用。
In this study, the high-temperature microstructural characteristics of the Ti–5Al–1Sn–1Fe–1Cr (Ti-5111) alloy were determined by optical microscopy, scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectrometry. During solution treatment between 800 and 1000°C, the phase transformation sequence of the alloy was found to be (α+β)→(α+α′+β)→(α+α′+α″+residual β)→(α′+β). The residual β phase subsequently transforms to the α″ phase during quenching. The driving force for this transformation is the cooling rate. The martensite starting point (Ms) and β transus temperature of the Ti-5111 alloy are nearly 860 and 960°C, respectively. These values are lower than those of the Ti–6Al–4V alloy. Moreover, it is believed that the concentration of Al in α′ martensite plays a crucial role in the formation of the twin-type martensite.