Exploring the concurrence of phase transition and grain growth in nanostructured alloy

Exploring the concurrence of phase transition and grain growth in nanostructured alloy
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探索纳米结构合金中相变和晶粒长大的同时发生

DOI:
10.1016/j.actamat.2016.07.052
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发表时间:
2016-10
期刊:
影响因子:
9.4
通讯作者:
Liu Feng
Liu Feng
中科院分区:
材料科学1区
文献类型:
--
作者:
Huang Linke;Lin Weitong;Lin Bo;Liu Feng

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在纳米结构合金中,(固态)晶粒生长和相变的同时发生是普遍存在的。然而,由于缺乏动力学证据,并发的基本物理原理仍然知之甚少。在这项研究中,以纳米结构铁合金为模型体系,利用原位X射线衍射和原位高分辨率透射电子显微镜(HRTEM)同时进行了宏观和微观尺度的表征。宏观上,晶粒生长在相变结束之前发生和停止,微观上,也证明了晶界(GB)和相界(PB)迁移的同时发生。这些实验结果与异位HRTEM和分子动力学模拟一起揭示了GB和PB迁移之间的相互作用,即当PB与GB相互作用时,PB迁移的速度和方向都会受到影响。在此基础上,利用并发性产生了一种新型的异质分层微观结构(即双相双峰纳米结构)。目前的发现使人们对纳米结构合金中的相变有了深入的了解,并进一步证明了并发在操纵纳米结构以开发纳米结构合金中的潜在用途。
In nanostructured alloys, the concurrence of (solid-state) grain growth and phase transition is ubiquitously observed; however, due to the lack of kinetic evidences, the underlying physics of concurrence remains scarcely understood. In this study, for nanostructured Fe alloy as a model system, macro- and micro-scale characterizations for the concurrence were carried out usingin situX-ray diffraction andin situhigh-resolution transmission electron microscopy (HRTEM). Macroscopically, the grain growth occurs and ceases before the end of phase transition, and microscopically, the concurrence of grain boundary (GB) and phase boundary (PB) migrations was certified as well. These experimental results, together with theex situHRTEM and molecular dynamics simulation, uncovered the interaction between GB and PB migrations, i.e., both velocity and direction of the PB migration are influenced when the PB interacts with the GB. On this basis, the concurrence was utilized to produce a new kind of heterogeneous and hierarchical microstructure (i.e., dual-phase bimodal nanostructure). The present findings, yield a deep understanding of the phase transition in nanostructured alloys, and further, demonstrate the potential usage of concurrence in manipulating the nanostructures for the development of nanostructured alloys.
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