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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Mechanically alloyed and hot pressed Ni-49.7Ti alloy showing martensitic transformation
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Mechanically alloyed and hot pressed Ni-49.7Ti alloy showing martensitic transformation

机译：机械合金化和热压Ni-49.7Ti合金，表现出马氏体相变

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摘要

The Ni-49.7Ti (at.%) alloy was prepared by mechanical alloying (MA) and different steps of milling were investigated. An almost fully amorphous alloy was obtained after 32 h of milling. After consolidation by uniaxial hot die pressing and annealing at 1000℃ for 28 h, a complicated multiphase structure composed of Ni_3Ti, NiTi_2 and NiTi phases was formed. The β-NiTi phase undergoes reversible thermoelastic martensitic transformation (MT) with Ms temperature as high as 172℃. This phenomenon was explained by Fe and Cr solute content introducing during milling and formation of the 4H martensite structure. The structure observations performed using scanning electron microscopy allowed to conclude that the average chemical composition of individual grains was Ti—49.7, Ni—47.76, Fe—2.54 (all in at.%). The second phase between the rounded β-NiTi grains was identified as the Ni_3Ti phase and additionally, in some other places of the sample the Ni_3Ti phase was also found. Transmission electron microscopy (TEM) of sintered samples confirmed the presence of 4H martensite within fine grains of the β-NiTi phase.
机译：通过机械合金化（MA）制备Ni-49.7Ti（at。％）合金，并研究了铣削的不同步骤。铣削32小时后，获得了几乎完全非晶态的合金。通过单轴热压模固结并在1000℃下退火28 h，形成了由Ni_3Ti，NiTi_2和NiTi相组成的复杂多相结构。 β-NiTi相经历Ms温度高达172℃的可逆热弹性马氏体转变（MT）。这种现象可以通过在4H马氏体组织的研磨和形成过程中引入Fe和Cr溶质含量来解释。使用扫描电子显微镜进行的结构观察可以得出结论，单个晶粒的平均化学组成为Ti-49.7，Ni-47.76，Fe-2.54（均以原子％计）。圆形的β-NiTi晶粒之间的第二相被识别为Ni_3Ti相，此外，在样品的其他位置也发现了Ni_3Ti相。烧结样品的透射电子显微镜（TEM）证实了β-NiTi相细晶粒中存在4H马氏体。

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