{"title":"Improving formability of AZ31B magnesium alloy induced by twinning multiplication and annihilation during electromagnetic forming","authors":"Shu Wang, Sheng Liu, Xiaoming Sun, Xiaohui Cui","doi":"10.1007/s43452-024-01057-7","DOIUrl":null,"url":null,"abstract":"<div><p>The high-rate forming method, such as electromagnetic forming (EMF), can enhance the formability of materials. However, the deformation mechanism of EMF has received little attention for AZ31B magnesium alloy. To this end, the quasi-static stamping (QS) and EMF experiments of AZ31B Mg alloy under uniaxial tension, equiaxial tension and plane strain are carried out in this paper. The results show the maximum forming height and limit strain of EMF samples were 33% and 96.7% higher than QS sample, respectively. In the QS process, the twinning density of AZ31B alloy increases gradually, but the overall number is rare. In the EMF process, the twinning number shows a multiplication—annihilation—stabilization trend, but the overall number is more. This indicates that the deformation mechanism of AZ31B alloy during QS is dominated by dislocation slip, and the twinning–detwinning–dislocation slip occurs sequentially during EMF. That is, EMF induces a transformation in the deformation mechanism. The transformation early consumes severe plastic deformation energy and releases stress, so directly enhances the formability of AZ31B alloy. Meanwhile, the increase of the boundaries and the weakening of the basal texture caused by the transformation indirectly promotes formability of AZ31B alloy. In addition, activation of (11–20) slip system, more pyramidal <<i>c</i> + <i>a</i>> dislocations and wave-like slips induced by EMF is also beneficial to improve the formability of AZ31B alloy.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.4000,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Archives of Civil and Mechanical Engineering","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s43452-024-01057-7","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}
引用次数: 0
Abstract
The high-rate forming method, such as electromagnetic forming (EMF), can enhance the formability of materials. However, the deformation mechanism of EMF has received little attention for AZ31B magnesium alloy. To this end, the quasi-static stamping (QS) and EMF experiments of AZ31B Mg alloy under uniaxial tension, equiaxial tension and plane strain are carried out in this paper. The results show the maximum forming height and limit strain of EMF samples were 33% and 96.7% higher than QS sample, respectively. In the QS process, the twinning density of AZ31B alloy increases gradually, but the overall number is rare. In the EMF process, the twinning number shows a multiplication—annihilation—stabilization trend, but the overall number is more. This indicates that the deformation mechanism of AZ31B alloy during QS is dominated by dislocation slip, and the twinning–detwinning–dislocation slip occurs sequentially during EMF. That is, EMF induces a transformation in the deformation mechanism. The transformation early consumes severe plastic deformation energy and releases stress, so directly enhances the formability of AZ31B alloy. Meanwhile, the increase of the boundaries and the weakening of the basal texture caused by the transformation indirectly promotes formability of AZ31B alloy. In addition, activation of (11–20) slip system, more pyramidal <c + a> dislocations and wave-like slips induced by EMF is also beneficial to improve the formability of AZ31B alloy.
期刊介绍：
Archives of Civil and Mechanical Engineering (ACME) publishes both theoretical and experimental original research articles which explore or exploit new ideas and techniques in three main areas: structural engineering, mechanics of materials and materials science.
The aim of the journal is to advance science related to structural engineering focusing on structures, machines and mechanical systems. The journal also promotes advancement in the area of mechanics of materials, by publishing most recent findings in elasticity, plasticity, rheology, fatigue and fracture mechanics.
The third area the journal is concentrating on is materials science, with emphasis on metals, composites, etc., their structures and properties as well as methods of evaluation.
In addition to research papers, the Editorial Board welcomes state-of-the-art reviews on specialized topics. All such articles have to be sent to the Editor-in-Chief before submission for pre-submission review process. Only articles approved by the Editor-in-Chief in pre-submission process can be submitted to the journal for further processing. Approval in pre-submission stage doesn''t guarantee acceptance for publication as all papers are subject to a regular referee procedure.
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