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首页> 外文期刊>Physica, B. Condensed Matter >Mechanical response of proton beam irradiated nitinol
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Mechanical response of proton beam irradiated nitinol

机译：质子束辐照镍钛合金的机械响应

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摘要

The present investigation deals with the study of mechanical behavior of proton beam irradiated nitinol at room temperature. The specimens in austenitic phase were irradiated over periods of 15, 30, 45 and 60 min at room temperature using 2 MeV proton beam obtained from Pelletron accelerator. The stressstrain curves of both unirradiated and irradiated specimens were obtained using a universal testing machine at room temperature. The results of the experiment show that an intermediate rhombohedral (R) phase has been introduced between austenite and martensite phase, which resulted in the suppression of direct transformation from austenite to martensite (AM). Stresses required to start R-phase (σ_(RS)) and martensitic phase (σ_(MS)) were observed to decrease with increase in exposure time. The hardness tests of samples before and after irradiation were also carried out using Vickers hardness tester. The comparison reveals that the hardness is higher in irradiated specimens than that of the unirradiated one. The increase in hardness is quite sharp in specimens irradiated for 15 min, which then increases linearly as the exposure time is increased up to 60 min. The generation of R-phase, variations in the transformation stresses σ_(RS) and σ_(MS) and increase in hardness of irradiated nitinol may be attributed to lattice disorder and associated changes in crystal structure induced by proton beam irradiation.
机译：本研究涉及室温下质子束辐照镍钛诺的力学行为的研究。使用从Pelletron加速器获得的2 MeV质子束，在室温下在15、30、45和60分钟的时间段内辐照奥氏体相的样品。使用万能试验机在室温下获得未辐照和辐照样品的应力-应变曲线。实验结果表明，在奥氏体和马氏体相之间引入了中间菱形（R）相，从而抑制了从奥氏体到马氏体（AM）的直接转变。观察到开始R相（σ_（RS））和马氏体相（σ_（MS））所需的应力随暴露时间的增加而降低。还使用维氏硬度测试仪进行了辐照前后样品的硬度测试。比较表明，被辐照的样品的硬度高于未辐照的样品。辐照15分钟的样品，硬度的增加非常明显，然后随着暴露时间增加至60分钟而线性增加。 R相的产生，相变应力σ_（RS）和σ_（MS）的变化以及被辐射的镍钛诺的硬度增加可能归因于晶格无序以及质子束辐射引起的相关晶体结构变化。

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