(1. 西南大學(xué) 材料與能源學(xué)院，重慶 400715；
2. 重慶大學(xué) 國(guó)家鎂合金材料工程與技術(shù)研究中心，重慶 40044)
摘 要: 鎂是密排六方結(jié)構(gòu)金屬，滑移系較少，其基面滑移阻力比柱面和錐面滑移阻力低很多，基面滑移啟動(dòng)后其他滑移系很難啟動(dòng)，導(dǎo)致鎂合金室溫和低溫的塑性變形能力較差。重慶大學(xué)等單位研究發(fā)現(xiàn)某些特定原子固溶在鎂中既能阻礙基面位錯(cuò)滑移提高強(qiáng)度，又能通過(guò)縮小基面與非基面滑移阻力差距促進(jìn)非基面滑移開(kāi)啟而改善塑性，達(dá)到同時(shí)提高鎂合金強(qiáng)度和塑性的目的。重慶大學(xué)鎂合金科研團(tuán)隊(duì)把這一結(jié)果發(fā)展為“鎂合金固溶強(qiáng)化增塑”合金設(shè)計(jì)理論(Solid solution strengthening and ductilizing, SSSD)。這一合金設(shè)計(jì)理論在過(guò)去十幾年中已成為解決鎂合金強(qiáng)度和塑性平衡優(yōu)化的一條新途徑。重慶大學(xué)應(yīng)用該理論開(kāi)發(fā)了多種新型高性能鎂合金，其中10多個(gè)新合金已批準(zhǔn)為國(guó)家標(biāo)準(zhǔn)牌號(hào)合金和國(guó)際標(biāo)準(zhǔn)牌號(hào)合金。
關(guān)鍵字: 鎂合金；強(qiáng)度；塑性；固溶強(qiáng)化增塑
（1. School of Materials and Energy, Southwest University, Chongqing 400715, China;
2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China）
Abstract:Mg has a HCP structure with few slip systems, and the slip resistance for basal slip is much lower than that of prismatic and pyramidal slip. It is generally difficult to activate non-basal slip at room and low temperature, resulting in a poor ductility and formability of magnesium alloys. Chongqing University and other institutions have found that the solution of certain elements in Mg can not only improve the strength by hindering the basal slip, but also improve the ductility by reducing the gap of slip resistance between basal slip and non-basal slip. According to these results, Chongqing University has proposed a theory of alloy design —— solid solution strengthening and ductilizing (SSSD) for magnesium alloy, which has become a new way to optimize the strength-ductility balance of magnesium alloys in the past decade. Using SSSD theory, Chongqing University has developed many new high performance magnesium alloys, among which over 10 alloys have been included in GB/T national standard and ISO international standard.
Key words: magnesium alloys; strength; ductility; solid solution strengthening and ductilizing
