摘要
目前机械强度低和降解速率快是制约镁合金广泛应用的两大缺陷。长周期有序(LPSO)相的引入,可在不牺牲合金伸长率的情况下,有效提升其拉伸强度与屈服强度,并调控合金耐蚀性能。但是,LPSO相结构与其对力学性能的贡献未建立明确定量关系,对腐蚀失效的微观机制尚存在争议,且LPSO相对力学和腐蚀性能强化效果不匹配的核心问题尚未解决。因此,本文从LPSO相形成微观机制出发,阐述形变过程中LPSO相对再结晶及强韧化的影响规律,针对LPSO相的腐蚀屏障与电偶腐蚀间的竞争机制,揭示腐蚀失效的微观机制。同时,本文全面总结LPSO相强化机制,并展望LPSO相在镁合金中的应用前景及发展方向。
At present, low mechanical strength and fast degradation rate are two major defects that restrict the wide application of magnesium alloys. The long-period order(LPSO) phase can effectively improve the tensile strength and yield strength of Mg alloy while maintaining its original elongation, and regulate its corrosion resistance.However, there is no clear quantitative relationship between the phase structure of LPSO and its contribution to mechanical properties. The micro-mechanism of corrosion failure is still controversial and the core problem of mismatch between the relative mechanical and corrosion strengthening effects of LPSO has not been solved.Therefore, starting from the microscopic mechanism of LPSO phase formation, this paper expounded the influence law of LPSO relative recrystallization and strengthening-toughness during the deformation process. The microscopic mechanism of corrosion failure were described according to the competition mechanism between the corrosion barrier of LPSO phase and galvanic corrosion. Meantime, this paper summarized the strengthening mechanism of LPSO phase, and looked forward to the application prospect and development directions of the LPSO phase in magnesium alloys.
作者
郑亚琪
张源
陈连生
田亚强
郑小平
李静媛
闫克霄
ZHENG Ya-qi;ZHANG Yuan;CHEN Lian-sheng;TIAN Ya-qiang;ZHENG Xiao-ping;LI Jing-yuan;YAN Ke-xiao(Colledge of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Department of Civil Engineering,Tsinghua University,Beijing 100000,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2023年第1期112-126,共15页
The Chinese Journal of Nonferrous Metals
基金
中央引导地方科技发展资金资助项目(226Z1004G)
河北省自然科学基金资助项目(E2020209153)
新金属材料国家重点实验室开放基金资助项目(2020-Z12)
唐山市科技计划项目(20130205b)。
关键词
LPSO相
强韧化机制
腐蚀性能
扭结变形
LPSO phase
strengthening and toughening mechanism
corrosion performance
kink deformation
