Strength-ductility synergy in Mg98.3Y1.3Ni0.4 alloy processed by high temperature homogenization and rolling
Strength-ductility synergy in Mg98.3Y1.3Ni0.4 alloy processed by high temperature homogenization and rolling
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高温均匀化轧制Mg98.3Y1.3Ni0.4合金的强塑协同
DOI：
10.1016/j.scriptamat.2021.114345
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发表时间：
2022
影响因子：
6
通讯作者：
Fusheng Pan
中科院分区：
文献类型：
--
作者：
Yucheng Zhou;Qun Luo;Bin Jiang;QianLi;Fusheng Pan
采用高温均匀化和轧制相结合的方法制备了一种含有长周期堆垛有序相（LPSO）的新型Mg98.3Y1.3Ni0.4合金，该合金具有良好的强韧协同效应，拉伸强度为320 MPa，延伸率为17.0%，拉伸变形时加工硬化率较低。均匀化处理后，原始晶粒中存在片层状LPSO相。细化晶粒、破碎LPSO相和高密度几何必需位错使轧制态合金具有良好的强度，其强度增量分别为146.3MPa、51.7MPa和68.3MPa。原位拉伸试验结果表明，LPSO相具有良好的塑性和低的加工硬化率，这主要是由于弱的基面织构、高Schmid因子的非基面滑移的激活和高密度位错的湮灭所致; LPSO相具有良好的塑性，表现为非基面滑移的变形协调、变形孪晶、晶粒旋转和塑性变形能量的吸收。
A new Mg98.3Y1.3Ni0.4alloy containing long period stacking ordered (LPSO) phases with good strength-ductility synergy was prepared by high temperature homogenization and rolling, which possesses a high ultimate tensile strength of 320 MPa and elongation of 17.0% and low work hardening rate during tensile deformation. Bulk LPSO phases with lamellar morphology exist in original grains after homogenization. Refined grains, broken LPSO phases and high-density geometrically necessary dislocations provide a good strength for as-rolled alloy with the strength increment of 146.3 MPa, 51.7 MPa and 68.3 MPa, respectively. Good ductility and low work hardening rate are attributed to weak basal texture, activation of non-basal slips with high Schmid factors and annihilation of high-density dislocations.In situtensile testing result shows deformation coordination by non-basal slips, deformation twinning, grain rotation and absorption of plastic deformation energy by LPSO phases, which suggests a good ductility as well.
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