Role of homogenization on tensile properties and microstructures in a dilute Mg–Zn–Ca–Mn alloy sheet
Role of homogenization on tensile properties and microstructures in a dilute Mg–Zn–Ca–Mn alloy sheet
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DOI：
10.1016/j.msea.2021.142541
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发表时间：
2021-12
期刊：
影响因子：
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通讯作者：
T. Nakata;C. Xu;Y. Ito;S. Kamado
中科院分区：
文献类型：
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作者：
T. Nakata;C. Xu;Y. Ito;S. Kamado
研究了均匀化处理对Mg-Zn-Ca-Mn合金薄板组织和拉伸性能的影响。在轧制前，480 °C的高温均匀化溶解了共晶金属间相;然而，αMn沉淀物显著生长，导致轧制和退火合金板中的粗晶粒结构。虽然轧制没有均匀化或低温均匀化后，导致在退火状态下的金属间相的分数略有增加，细晶粒组织实现由于细分散的αMn沉淀。退火后的板材具有良好的0.2%屈服强度和断裂伸长率，分别为176 MPa和23.4%沿着轧制方向。不幸的是，退火板具有面内屈服各向异性，但由于其细晶粒结构，即使沿着横向也可以保持142 MPa的中等0.2%拉伸屈服强度。
The effect of homogenization on microstructures and tensile properties in a dilute Mg–Zn–Ca–Mn alloy sheet was investigated. High-temperature homogenization at 480 °C dissolved eutectic intermetallic phases before rolling; however, there was a significant growth of αMn precipitates, resulting in a coarse grain structure in the rolled and annealed alloy sheet. Although rolling without homogenization or after low-temperature homogenization led to a slight increase in the fraction of intermetallic phases in the annealed state, fine grain structure was achieved due to finely dispersed αMn precipitates. Especially, fine average grain size of 8.9 μm was obtained without any homogenization, and the annealed sheet exhibited good 0.2% tensile yield strength and elongation to failure of 176 MPa and 23.4% along the rolling direction. Unfortunately, the annealed sheet had an in-plane yield anisotropy, but the moderate 0.2% tensile yield strength of 142 MPa could be kept even along the transverse direction due to its fine grain structure.