Strain-Rate Sensitivity, Tension-Compression Asymmetry, r-Ratio, Twinning, and Texture Evolution of a Rolled Magnesium Alloy Mg-1.3Zn-0.4Ca-0.4Mn
Strain-Rate Sensitivity, Tension-Compression Asymmetry, r-Ratio, Twinning, and Texture Evolution of a Rolled Magnesium Alloy Mg-1.3Zn-0.4Ca-0.4Mn
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DOI：
10.1007/s11661-020-05841-x
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发表时间：
2020-06
期刊：
影响因子：
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通讯作者：
E. Vasilev;Nicholas C. Ferreri;R. Decker;I. Beyerlein;M. Knezevic
中科院分区：
文献类型：
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作者：
E. Vasilev;Nicholas C. Ferreri;R. Decker;I. Beyerlein;M. Knezevic
在这项工作中，研究了用于生物相容性应用的镁 (Mg) 合金 Mg-1.3Zn-0.4Ca-0.4Mn 的变形响应、织构演变和孪生发展。此外，通过检查瞬时比和应变率敏感性（SRS）作为应变和载荷方向的函数，研究了合金的成形性。研究发现，经过轧制和峰值时效后，合金具有中等强度的轧制织构，基面包含在轧制平面内，并且具有双峰细晶组织。该合金在轧制方向 (RD) 上表现出较高的室温拉伸强度 (300 MPa) 和延展性 (25 pct)，而且值得注意的是，在所有三个面内测试方向上，r 比率均接近饱和。还发现，SRS 相对较高且均匀，平均值范围为 0.015 至 0.025，具体取决于面内测试方向。与纯镁及其大多数生物相容性合金相比，这些都是出色的特性。作为镁合金的典型特征，该合金具有多种孪晶模式的孪晶倾向，导致织构快速演变、各向异性和屈服应力的拉压 (T-C) 不对称，其中压缩响应较弱。本文介绍并讨论了这些机械特性及其微观结构起源。
In this work, the deformation response, texture evolution, and twinning development of a magnesium (Mg) alloy, Mg-1.3Zn-0.4Ca-0.4Mn, for biocompatible applications are investigated. Further, the alloy’s formability, by examining the instantaneousr-ratio and strain-rate sensitivity (SRS) as a function of strain and loading direction, is investigated. It is found that after rolling and peak aging, the alloy has a rolled texture of moderate intensity with the basal planes contained in the rolling plane and with a bimodal, fine-grained microstructure. The alloy shows both high room-temperature tensile strength (300 MPa) and ductility (25 pct) in the rolling direction (RD) and, remarkably,r-ratios saturating close to unity in all three in-plane testing directions. It is also found that the SRS is relatively high and uniform, with averages ranging from 0.015 to 0.025, depending on the in-plane testing directions. These are outstanding properties compared to pure Mg and most of its biocompatible alloys. Typical of Mg alloys, this alloy has a propensity for twinning by multiple twin modes, which leads to rapid texture evolution, anisotropy, and tension-compression (T-C) asymmetry in yield stress, with compression having the weaker response. These mechanical characteristics along with their microstructural origins are presented and discussed in this article.