arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.11659cond-mat.mtrl-sci
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He对辐照下Ni3Al有序-无序转变的影响

Effect of He on the Order-Disorder Transition in Ni3Al under Irradiation

Peyman Saidi, Pooyan Changizian, Eric Nicholson, He Ken Zhang, Yu Luo, Zhongwen Yao, Chandra Veer Singh, Mark R. Daymond, Laurent Karim Beland

摘要:

Ni-Al合金在辐照下的有序-无序转变代表了各种重新有序化过程和由于入射高能粒子产生的热尖峰引起的无序化之间的相互作用。通常,有序化通过热产生的空位的扩散实现,并且只能在它们可移动且浓度足够高的温度下发生。在这里,原位透射电子显微照片显示,He的存在下,通常被认为是一个有害的不混溶原子在这种材料中,促进重新排序在Ni 3Al的温度下,空位不是有效的排序剂。率理论模型,定量地解释了这种行为,从原子模拟提取的参数的基础上。这些计算表明,V2 He配合物是一种有效的代理,通过其高稳定性和流动性。据推测,不混溶的原子可以稳定在其他材料中的重新排序剂进行驱动过程,并保持有序相的温度下,否则驱动过程会导致混乱。

英文摘要:

The order-disorder transition in Ni-Al alloys under irradiation represents an interplay between various re-ordering processes and disordering due to thermal spikes generated by incident high energy particles. Typically, ordering in enabled by diffusion of thermally-generated vacancies, and can only take place at temperatures where they are mobile and in sufficiently high concentration. Here, in-situ transmission electron micrographs reveal that the presence of He, usually considered to be a deleterious immiscible atom in this material, promotes reordering in Ni3Al at temperatures where vacancies are not effective ordering agents. A rate-theory model is presented, that quantitatively explains this behavior, based on parameters extracted from atomistic simulations. These calculations show that the V2He complex is an effective agent through its high stability and mobility. It is surmised that immiscible atoms may stabilize reordering agents in other materials undergoing driven processes, and preserve ordered phases at temperature where the driven processes would otherwise lead to disorder.

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