一种具有高拉伸性能和室温可成型性的新型镁薄板合金。

A new magnesium sheet alloy with high tensile properties and room-temperature formability.

作者信息

Shi Renhai, Miao Jiashi, Avey Thomas, Luo Alan A

机构信息

Department of Materials Science & Engineering, The Ohio State University, Columbus, OH, USA.

Department of Integrated Systems Engineering, The Ohio State University, Columbus, OH, USA.

出版信息

Sci Rep. 2020 Jun 22;10(1):10044. doi: 10.1038/s41598-020-67161-9.

DOI:10.1038/s41598-020-67161-9

PMID:32572096

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7308300/

Abstract

Lightweight sheet alloys with superior mechanical performance such as high strength, ductility and formability at room temperature (RT) are desirable for high volume automotive applications. However, ductility or formability of metallic alloys at RT are generally inversely related to strength, thereby making it difficult to optimize all three simultaneously. Here we design a new magnesium sheet alloy-ZAXME11100 (Mg-1.0Zn-1.0Al-0.5Ca-0.4Mn-0.2Ce, wt. pct.) via CALPHAD (CALculation of PHAse Diagram) modeling and experimental validation. This new sheet alloy offers an excellent RT formability with a high Index Erichsen (I.E.) value of 7.8 mm in a solution-treated condition (T4), due to its weak and split basal texture and fine grain structure. The new ZAXME 11100 alloy also shows a rapid age-hardening response during post-forming artificial aging treatment at 210 °C for 1 hour (T6), resulting in a significant increase of yield strength from 159 MPa (T4) to 270 MPa (T6). The excellent combination of T4 ductility (31%), T4 formability (7.8 mm) and T6 yield strength (270 MPa) in this new magnesium alloy is comparable to that of common 6xxx series aluminum sheet alloys. Thus, this new magnesium sheet alloy is highly attractive for sheet applications in automotive and other industries.

摘要

具有优异机械性能（如室温下的高强度、延展性和可成形性）的轻质板材合金，对于大规模汽车应用来说是理想之选。然而，金属合金在室温下的延展性或可成形性通常与强度呈负相关，因此难以同时优化这三者。在此，我们通过相图计算（CALPHAD）建模和实验验证，设计了一种新型镁板材合金——ZAXME11100（Mg-1.0Zn-1.0Al-0.5Ca-0.4Mn-0.2Ce，重量百分比）。这种新型板材合金在固溶处理状态（T4）下具有出色的室温可成形性，其艾氏杯突值（I.E.）高达7.8毫米，这归因于其较弱且分散的基面织构以及细晶结构。新型ZAXME 11100合金在210°C下进行1小时的成形后人工时效处理（T6）期间，还表现出快速的时效硬化响应，屈服强度从159兆帕（T4）显著提高到270兆帕（T6）。这种新型镁合金在T4状态下的延展性（31%）、T4状态下的可成形性（7.8毫米）和T6状态下的屈服强度（270兆帕）的优异组合，与常见的6xxx系列铝板合金相当。因此，这种新型镁板材合金在汽车及其他行业的板材应用中极具吸引力。