(1. 重慶大學(xué) 材料科學(xué)與工程學(xué)院，重慶 400044；
2. 西南大學(xué) 材料與能源學(xué)部，重慶 400715)
摘 要: 闡述了鎂合金拉伸壓縮不對稱性的形成機(jī)理；概括了鎂合金拉伸壓縮不對稱性的影響因素及控制方式。鎂合金拉伸壓縮不對稱性的存在主要源于產(chǎn)生的織構(gòu)和孿生的極性。通過調(diào)控織構(gòu)、晶粒尺寸、合金元素、第二相形貌可有效地改善鎂合金的拉伸壓縮不對稱性。然而，目前還缺乏針對不同因素對鎂合金拉伸壓縮不對稱性影響的定量分析，有必要建立以上所述各微觀組織與鎂合金拉伸壓縮不對稱性的關(guān)系。最終，期望通過優(yōu)化微觀組織的貢獻(xiàn)最大幅度地降低材料的拉伸壓縮不對稱性。
關(guān)鍵字: 鎂合金；孿生；晶粒尺寸；屈服不對稱性；合金化
（1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. Faculty of Materials and Energy, Southwest University, Chongqing 400715, China）
Abstract:The formation mechanism of the tension-compression yield asymmetry of magnesium alloys was summarized. The influencing factors and controlling methods of the yield asymmetry were reviewed. The yield asymmetry is mainly attributed to the strong deformation texture of wrought magnesium alloys and the polar nature of twining. The yield asymmetry can be improved by controlling texture, grain size, alloying elements and precipitate shape. However, comparatively little attention has been paid to quantitative evaluation on the contribution of each factor to yield asymmetry. Therefore, it is desirable to build the correlation between the above mentioned microstructural aspects and yield asymmetry. Then, it is expected that yield asymmetry can be greatly reduced by optimizing each parameter.
Key words: magnesium alloy; twinning; grain size; yield asymmetry; alloying
