Martensitic transformations, microstructure, and mechanical workability of TiPt
Martensitic transformations, microstructure, and mechanical workability of TiPt
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TiPt 的马氏体转变、显微组织和机械加工性
DOI：
10.1007/s11661-001-0001-5
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
L. Cornish
中科院分区：
文献类型：
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作者：
T. Biggs;M. Cortie;M. Witcomb;L. Cornish
据报道，具有B2结构的TiPT相在1000℃左右发生了向B19马氏体的可逆位移相变。因此，这个系统原则上可以作为高温形状记忆合金(SMA)的基础。然而，关于B2和B19形式的TIPT的更多细节几乎没有公布。在本工作中，确认了以前报道的B19→B2转变温度，但发现B2→B19温度比以前接受的温度低约40℃。当化学计量比为∼50at时，B19马氏体的硬度最低。个位数在45和∼50之间。PCT铂，B2↔B19的转变似乎是在一个复杂的序列中发生的，在大约50°C的范围内，最多有两个中间相是稳定的，没有发现这种中间相存在的证据，铂的含量从50℃到56at。个位数很明显，铂含量约为50At。PCT标志着TiPT相及其马氏体的性质发生了显著变化。研究还发现，TIPT的稳定性范围比当前相图显示的稍宽一些，从45℃延伸到56℃。1300°C时的Pct铂
The TiPt phase with the B2 structure has been reported to undergo a reversible displacive transformation to B19 martensite at about 1000 °C. This system could, therefore, serve in principle as the basis of a high-temperature shape-memory alloy (SMA). However, very few additional details of the B2 and B19 forms of TiPt have been published. In the present work, the B19→B2 transformation temperatures previously reported are confirmed, but the B2→B19 temperatures are found to be about 40 °C lower than previously accepted. The hardness of B19 martensite shows a minimum at a stoichiometry of ∼50 at. pct Pt. Between 45 and ∼50 at. pct Pt, the B2↔B19 transformations appear to take place in a complex sequence, with up to two intermediate phases being stable over a range of about 50 °C. No evidence for this intermediate phase was found for Pt contents from 50 to 56 at. pct Pt. It is clear that a Pt content of about 50 at. pct marks a significant change in the nature of the TiPt phase and its martensite or martensites. It was also found that TiPt has a slightly wider stability range than is shown in the current phase diagram, extending from 45 to 56 at. pct Pt at 1300 °C.