Influence of Ni on stability of martensitic transformation in Zr50Cu50−xNix
Influence of Ni on stability of martensitic transformation in Zr50Cu50−xNix
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DOI：
10.1016/j.jallcom.2012.01.089
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发表时间：
2013-11
影响因子：
6.2
通讯作者：
F. Meng;K. Tsuchiya;Seiichiro;Y. Yokoyama
中科院分区：
文献类型：
--
作者：
F. Meng;K. Tsuchiya;Seiichiro;Y. Yokoyama
研究了Ni含量对Zr50Cu50−xNix（x= 0，5，10，15）马氏体相变稳定性和组织演变的影响。显微组织观察表明，所有合金中均存在B19′和Cm马氏体。热行为结果表明，随着Ni含量从5 mol. %增加到15 mol.%，初始Ms从433 K增加到699 K。当x = 5时，热循环后，正、逆马氏体相变消失。对于x = 10和15，即使在10次循环后，两种转化仍然存在。x = 15合金的正相变和逆相变均观察到两步相变行为。Ni的加入降低了相变滞后。显微结构观察显示，Ni添加量高达10摩尔%在10次热循环过程中，ZrCu相的分解受到抑制。这些结果表明，添加超过10摩尔%的镍，在热循环期间稳定马氏体转变。
Influence of Ni content on the stability of martensitic transformation and microstructure evolution was investigated in Zr50Cu50−xNix(x= 0, 5, 10, 15). Microstructural observations revealed that the both B19′ and Cm martensites were present in all the alloys investigated. The thermal behaviors results indicated that the initialMsincreased from 433 K to 699 K with an increase of Ni content from 5 to 15 mol.%. Forx= 5, the forward and reverse martensitic transformation disappeared after thermal cycling. Forx= 10 and 15, both transformation still remained even after 10 cycles. Two-step transformation behaviors were observed on both forward and reverse transformation inx= 15 alloy. Ni addition decreased the transformation hysteresis. Microstructural observations revealed the Ni addition up to 10 mol.% suppressed the decomposition of ZrCu into Zr2Cu and τ5phases during 10 thermal cycling treatments. These results indicated that the addition of Ni over 10 mol.% stabilized the martensitic transformation during thermal cycling.