镁元素对挤压高铝锌合金的组织与性能的影响

研究了镁元素对挤压高铝锌合金的组织和力学性能的影响，结果表明：与未加镁的合金相比，加入0.015%Mg，合金挤压态的抗拉强度从366 MPa提高到467 MPa、布氏硬度从HB91提高到HB114，伸长率从43.6%降低到27%；在320 ℃×2 h固溶处理水淬室温自然时效状态下，合金的抗拉强度从389 MPa提高到488 MPa，布氏硬度从HB107提高到HB139，伸长率从41%降低到28.3%；镁元素影响过饱和β相转变和分解产物形态，能阻碍合金的共析分解和室温时效脱溶析出。

Impact of Mg on microstructure and properties of extruded high aluminum zinc alloy

We addressed the impact of magnesium element on the microstructure and mechanical properties of extruded high aluminum zinc alloy. Results show that tensile strength of alloy increases from 366 MPa to 467 MPa for 0.015% Mg addition, as compared with none Mg alloy. Its brinell hardness increases from HB91 to HB114 and extension rate decreases from 43.6% to 27%.For solution treatment of 320 ℃×2 h water quenching,its tensile strength increases from 389 MPa to 488 MPa, its brinell hardness increases from HB107 to HB139 and extension rate decreases from 41% to 28.3%. Mg element can affect transformation of supersaturated β phase and morphology of decomposition product, and hinder alloy eutectoid decomposition and dissolution precipitation at room temperature.