质子和离子辐照对镁稀土合金力学性能的影响

文章研究了质子和离子（氮离子）辐照对镁稀土（Mg-Zn-Y-Zr）合金拉伸性能、表面硬度及拉伸变形断裂行为的影响。经能量为170 keV，注量分别为5×1015 /cm2、1×1016 /cm2、2×1016 /cm2、1×1017 /cm2的质子或离子辐照后，合金的拉伸性能和拉伸断口形貌没有发生显著变化，表明质子和离子辐照对Mg-Zn-Y-Zr合金宏观力学性能的影响有限，这与辐照粒子（质子或离子）对合金的穿透深度浅有关。纳米显微硬度测试和扫描分析结果显示，经氮离子辐照后，Mg-Zn-Y-Zr合金被辐照面表层发生了一定程度的硬化，纳米显微硬度随着辐照注量的增加而逐渐增加，而质子辐照的硬化效果不明显。

Effects of proton and ion irradiations on mechanical behavior of Mg-Zn-Y-Zr alloy

The effects of proton and ion irradiations on tensile property, surface hardness and deformation-fracture behavior of Mg-Zn-Y-Zr alloy are studied in this paper. The results show that there is little difference in the tensile properties and the tensile fracture features after the proton and nitrogen ion irradiations, with the energy of 170 keV and the fluence of 5×10¹⁵ /cm², 1×10¹⁶ /cm², 2×10¹⁶ /cm² and 1×10¹⁷/cm², respectively. This might be due to the shallow depth of the proton or ion particles injected into the alloy. It is also shown that the nano-hardness of ion irradiated surface is increased as the irradiation fluence increases, indicating the favorable hardening effect of ion irradiation on the Mg-Zn-Y-Zr alloy. On the contrary, no significant hardening effect on the investigated alloy was observed after the proton irradiation.