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首页> 外文期刊>Journal of Thermal Analysis and Calorimetry >Metastable effects on martensitic transformation in SMA
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Metastable effects on martensitic transformation in SMA

机译:亚稳态对SMA马氏体相变的影响

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The efficiency of shape memory alloy (SMA) as damper and/or standard actuator is truly enhanced when the material can be cycled without any relevant accumulation of the permanent deformation (i.e. under 0.5% for several hundreds of cycles). The particular properties of the CuAlBe alloy permit relevant grain growth with reasonable reduction of mechanical properties (from 300–350 to 250–300 MPa at fracture). Samples prepared with an appropriate heat thermal treatment (HTT) and relevant mean diameter of grain avoids accumulative deformation for series of cycles (near 500) up to 3.5% of deformation. The analysis of different wires of CuAlBe alloy shows, in the first part of HTT, a proportionality between the grain surface and the time at 1123 K. In the last part of the HTT the grain growth shows an increased complexity related with interactions between the grain boundaries and the external surface of the samples.
机译:当可以在没有任何相关永久变形累积的情况下循环材料(即在数百次循环中低于0.5%)时,形状记忆合金(SMA)作为阻尼器和/或标准执行器的效率将得到真正提高。 CuAlBe合金的特殊性能允许相应的晶粒长大,并适当降低机械性能(断裂时从300-350 MPa降至250-300 MPa)。使用适当的热处理(HTT)和相关的平均晶粒直径制备的样品可避免在一系列循环(接近500个)中产生高达3.5%变形的累积变形。对CuAlBe合金不同线材的分析显示,在HTT的第一部分中,晶粒表面与1123 K处的时间成比例。在HTT的最后一部分中,晶粒生长显示出与晶粒之间的相互作用相关的复杂性增加边界和样品的外表面。

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