材料科学
极限抗拉强度
加工硬化
合金
延伸率
复合材料
层状结构
变形机理
延展性(地球科学)
均质化(气候)
晶体孪晶
硬化(计算)
变形(气象学)
冶金
微观结构
生物
生物多样性
蠕动
图层(电子)
生态学
作者
Yucheng Zhou,Qun Luo,Bin Jiang,Qian Li,Fusheng Pan
标识
DOI:10.1016/j.scriptamat.2021.114345
摘要
A new Mg98.3Y1.3Ni0.4 alloy 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 situ tensile 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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