脉冲电流及其方向对AZ31镁合金超塑性变形影响的研究

IF 2.6 3区材料科学 Q2 ENGINEERING, MANUFACTURING

International Journal of Material Forming Pub Date : 2025-05-08 DOI:10.1007/s12289-025-01912-9

Hongzhe Wu, Chao Li, Zishuai Chen, Yihan Gao

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引用次数: 0

摘要

研究了AZ31镁合金在不同电流强度和方向下的高温拉伸行为。在350°C下，应变速率为1 × 10 - 3 s - 1，峰值电流密度为50 a /mm2，合金表现出增强的超塑性，断裂时的真应变从0.88增加到1.23。在二维电流场下，扩展区域的高径比由无电流时的0.45提高到0.56。SEM， EBSD和TEM分析表明，有利取向的脉冲电流增强了位错迁移率，促进了晶界滑动和旋转，促进了再结晶，有助于晶粒细化。

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Study on the effect of pulse current and its direction on superplastic deformation of AZ31 Magnesium alloy

This study investigates the high-temperature tensile behavior of AZ31 magnesium alloy under varying current intensities and directions. At 350 °C, with a strain rate of 1 × 10⁻³ s⁻¹ and a peak current density of 50 A/mm², the alloy demonstrates enhanced superplasticity, increasing its true strain at fracture from 0.88 to 1.23. The height-to-diameter ratio of the expanded region improves from 0.45 (without current) to 0.56 under a two-dimensional current field. SEM, EBSD, and TEM analyses reveal that a favourably oriented pulsed current enhances dislocation mobility, facilitates grain boundary sliding and rotation, and promotes recrystallization, contributing to grain refinement.

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来源期刊

International Journal of Material Forming ENGINEERING, MANUFACTURING-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.10

自引率

4.20%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal publishes and disseminates original research in the field of material forming. The research should constitute major achievements in the understanding, modeling or simulation of material forming processes. In this respect ‘forming’ implies a deliberate deformation of material. The journal establishes a platform of communication between engineers and scientists, covering all forming processes, including sheet forming, bulk forming, powder forming, forming in near-melt conditions (injection moulding, thixoforming, film blowing etc.), micro-forming, hydro-forming, thermo-forming, incremental forming etc. Other manufacturing technologies like machining and cutting can be included if the focus of the work is on plastic deformations. All materials (metals, ceramics, polymers, composites, glass, wood, fibre reinforced materials, materials in food processing, biomaterials, nano-materials, shape memory alloys etc.) and approaches (micro-macro modelling, thermo-mechanical modelling, numerical simulation including new and advanced numerical strategies, experimental analysis, inverse analysis, model identification, optimization, design and control of forming tools and machines, wear and friction, mechanical behavior and formability of materials etc.) are concerned.