HAADF-STEM和GPA研究了Mg-Gd-Y-Zr中β′相在时效过程中的取向和强化作用

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters Pub Date : 2021-12-29 DOI:10.1080/09500839.2021.2017048

C. Zhu, J. Zheng, Xiaoqin Zeng, Bin Chen

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引用次数: 2

摘要

摘要本研究采用高角度环形暗场扫描透射电子显微镜（HAADF-STEM）研究了Mg-Gd-Y-Zr合金中析出相的结构演变。在的三个等效晶体方向之一上，通过桥接相连接的相的线性排列形态由无缺陷随机分布相形成。考虑到沉淀物的显著强化作用，对几何相分析（GPA）测量的诱导应变场进行了新的研究。应变场的降低值解释了峰值时效后硬度的轻微降低。发现沉淀物的合并和重排释放了应变场。

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Alignment and strengthening effect of β ′ precipitates in Mg-Gd-Y-Zr during ageing process studied by HAADF-STEM and GPA

ABSTRACT In the present study, the structural evolution of the precipitates in Mg-Gd-Y-Zr alloy is investigated by means of high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The linearly aligned morphology of phases connected by bridging phase in one of the three equivalent crystal directions of is formed from defect-free randomly distributed phases. Considering the significant strengthening effect of precipitates, a novel perspective of investigating the induced strain field measured by geometric phase analysis (GPA) is conducted. The reducing value of the strain field accounts for a slight decrease in hardness after peak-ageing. Merging and rearrangement of precipitates are found to release the strain field.

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来源期刊

Philosophical Magazine Letters 物理-物理：凝聚态物理

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： Philosophical Magazine Letters is the rapid communications part of the highly respected Philosophical Magazine, which was first published in 1798. Its Editors consider for publication short and timely contributions in the field of condensed matter describing original results, theories and concepts relating to the structure and properties of crystalline materials, ceramics, polymers, glasses, amorphous films, composites and soft matter. Articles emphasizing experimental, theoretical and modelling studies on solids, especially those that interpret behaviour on a microscopic, atomic or electronic scale, are particularly appropriate. Manuscripts are considered on the strict condition that they have been submitted only to Philosophical Magazine Letters , that they have not been published already, and that they are not under consideration for publication elsewhere.