镁合金<strong>LPSO/SFs</strong>结构间<strong>{</strong><inline-formula><math xmlns:mml=

doi:10.11900/0412.1961.2022.00532

金属学报

2023, Vol. 59

Issue (4): 556-566 DOI: 10.11900/0412.1961.2022.00532

研究论文

本期目录 | 过刊浏览

镁合金LPSO/SFs结构间{

10 1 ¯ 2

}孪晶交汇机制的原子尺度研究

邵晓宏¹, 彭珍珍², 靳千千³, 马秀良¹(

)

¹中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
²河北科技大学材料科学与工程学院石家庄 050018
³广西科技大学电子工程学院先进物质结构研究中心柳州 545006

Unravelling the {

10 1 ¯ 2

} Twin Intersection Between LPSO Structure/SFs in Magnesium Alloy

SHAO Xiaohong¹, PENG Zhenzhen², JIN Qianqian³, MA Xiuliang¹(

)

¹Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
²School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China
³Center for the Structure of Advanced Matter, School of Electronic Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China

引用本文:

邵晓宏, 彭珍珍, 靳千千, 马秀良. 镁合金LPSO/SFs结构间{ $10 1 ¯ 2$ }孪晶交汇机制的原子尺度研究[J]. 金属学报, 2023, 59(4): 556-566.
Xiaohong SHAO, Zhenzhen PENG, Qianqian JIN, Xiuliang MA. Unravelling the { $10 1 ¯ 2$ } Twin Intersection Between LPSO Structure/SFs in Magnesium Alloy[J]. Acta Metall Sin, 2023, 59(4): 556-566.

全文: PDF(4541 KB) HTML

摘要:

以含长周期堆垛有序(LPSO)结构的Mg-Zn-Y(-Zr)合金为研究对象，运用透射电子显微方法，从原子尺度解析LPSO结构/富含溶质元素堆垛层错(SFs)对{ $10 1 ¯ 2$ }孪晶交汇行为的作用。结果表明：LPSO/SFs与孪晶交截处易形成基面-棱柱面，从而引起孪晶界在LPSO/SFs间弯曲成弓形，孪晶界存在Zn元素偏聚，Y元素偏聚不明显。LPSO/SFs间同轴{ $10 1 ¯ 2$ }孪晶变体交汇，引入基面-基面(BB)界面及柱面-柱面(PP)界面，且在近LPSO/SFs处产生三角形的局部基体结构。LPSO结构形成扭折时，{ $10 1 ¯ 2$ }孪晶在扭折界面单侧形核长大，此处扭折界面转为孪晶界面；残余扭折界面与基体侧孪晶扩展界面相交，在LPSO/SFs近邻处形成三角形的基体结构。LPSO/SFs/TSFs (孪晶层错)间不同孪晶变体形核，以及交汇引入的分割带来的Hall-Petch效应，可提升合金的硬化率。通过调控镁合金LPSO结构的间距和厚度引入不同孪晶变体，可为其优化性能提供新思路。

关键词 ：镁合金, LPSO结构, 孪晶, 球差校正扫描透射电镜, 原子尺度

Abstract：

The effect of long-period stacking ordered (LPSO) structure/solute-rich element laminar stacking faults (SFs) on the intersection of co-zone { $10 1 ¯ 2$ } twin variants was uncovered at the atomic scale by TEM. The results show that a basal-prismatic (BP) boundary is generally formed at the intersection of LPSO/SFs and twins, bending the twin boundaries (TBs) into a bow shape between the adjacent LPSO/SFs. The co-zone { $10 1 ¯ 2$ } twin variants and LPSO/SFs intersect with each other, introducing a basal-basal (BB) boundary and prismatic-prismatic (PP) boundaries, associated with a triangular matrix near the LPSO/SFs. More Zn atoms than Y atoms were segregated into the TBs. Also, when the LPSO structure is kinked, the { $10 1 ¯ 2$ } twin generates and grows on one side of the kink boundary, and the local kink boundary transforms into TB. The growing TB intersects with the residual kink boundary, leaving a triangular matrix near the LPSO/SFs. Multiple twin variants nucleate between the LPSO/SFs/TSFs (twinned stacking faults), and the associated Hall-Petch effect is brought by the segmentation introduced by the intersecting of variants, which can improve the Mg alloy hardening rate. Introducing different twin variants by regulating the LPSO structure's spacing and thickness in magnesium alloy may shed new light on optimizing their performance.

Key words： magnesium alloy LPSO structure twin Cs-corrected STEM atomic scale

收稿日期: 2022-10-21

ZTFLH:

TG146.2

基金资助:国家自然科学基金项目(51871222);国家自然科学基金项目(52171021)

通讯作者: 马秀良，xlma@imr.ac.cn，主要从事材料界面结构与缺陷的电子显微学研究

Corresponding author: MA Xiuliang, professor, Tel: (024)23971845, E-mail: xlma@imr.ac.cn

作者简介: 邵晓宏，女，1981年生，研究员，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2022.00532 或 https://www.ams.org.cn/CN/Y2023/V59/I4/556

图1 hcp结构Mg及镁合金中{101¯2}孪晶变体及长周期有序堆垛(LPSO)结构与孪晶的交互作用示意图

图2 含LPSO结构Mg-Zn-Y镁合金室温压缩前后的微观结构

图3 LPSO/SFs间{101¯2}共轴孪晶交汇形成基面-基面(BB)界面和柱面-柱面(PP)界面

图4 LPSO/TSFs间{101¯2}孪晶内部BB界面和{101¯1}孪晶共存

图5 LPSO与TSFs间Mg片层内{101¯2}孪晶相交形成BB界面

图6 LPSO结构间{101¯2}孪晶形核与相遇

图7 LPSO间{101¯2}孪晶形核、扩展与交汇示意图

图8 LPSO/SFs内扭折界面(KB)与{101¯2}孪晶共存形貌

图9 LPSO结构扭折促进{101¯2}孪晶在扭折带单侧形核

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