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首页> 外文期刊>Scripta materialia >Coherency strains of H-phase precipitates and their influence on functional properties of nickel-titanium-hafnium shape memory alloys
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Coherency strains of H-phase precipitates and their influence on functional properties of nickel-titanium-hafnium shape memory alloys

机译:H相沉淀的相干菌株及其对镍 - 铪 - 铪形记忆合金功能性的影响

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A Ni(50.3)Ti(41.7)Hfs alloy was studied after two-step aging treatments consisting of 300 degrees C for 12 h followed by 550 degrees C for different times. An anomalous change in transformation temperatures was observed as the second aging time was increased from 7.5 to 13.5 h. Initially with increased aging time (0.5-7.5 h) at 550 degrees C, coherency strain fields about H-phase precipitates increased. The corresponding backstress favored martensite formation, hence an increase in transformation temperatures. However, a point was eventually reached where misfit dislocations relaxed those strain fields and the effect was reduced, resulting in a decrease in transformation temperatures. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
机译:在两步老化治疗后,由300摄氏度的治疗组成12小时后,将Ni(50.3)Ti(41.7)HFS合金进行研究,然后进行550℃。 观察到转化温度的异常变化,因为第二老化时间从7.5增加到13.5小时。 最初在550℃下增加老化时间(0.5-7.5小时),关于H相沉淀物的一致性应变场增加。 相应的背面有利于马氏体形成,因此转化温度的增加。 然而,最终达到了一个点,在错入脱位放松那些应变场并且减少了效果,导致转化温度降低。 (c)2018 Acta Materialia Inc. elsevier有限公司出版。保留所有权利。

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