不同热处理制度及Mg/Si比对挤压型材性能的影响

Effect of Different Heat Treatment Systems and Mg/Si Ratio on Properties of Extruded Profiles

文章主要通过室温拉伸、维氏硬度、准静态压溃、晶间腐蚀等实验,研究不同热处理制度及Mg/Si比对挤压型材力学性能及腐蚀性能的影响。结果表明,Mg∶Si=1.20时,达到最大强度所需的时间较Mg∶Si=0.87时有所延迟;同时强度越大,吸收功越大,挤压型材吸收的能量越多。时效时间为2h^6h时,随着时效时间的延长,Mg∶Si=0.87时,硬度呈上升趋势,晶间腐蚀程度逐渐加深;Mg∶Si=1.20时,硬度先降低后升高,晶间腐蚀深度变浅,腐蚀程度降低。

The effects of different heat treatments and Mg/Si ratio on the mechanical properties and corrosion properties of extruded profiles are studied by room temperature tensile test,Vickers hardness test,quasi-static crushing test and intergranular corrosion test.The results show that when Mg∶Si=1.20,the time required to reach the maximum intensity is delayed compared to Mg∶Si=0.87.At the same time,the greater the intensity,the greater the absorption work,the more energy the extrusion profile absorbed.When the aging time is in the range of 2h^6h,with the extension of aging time,when Mg∶Si=0.87,the hardness shows an increasing trend and the degree of intergranular corrosion gradually increases.When Mg∶Si=1.20,the hardness decreases first and then increases,the intergranular corrosion depth becomes shallow,and the corrosion degree decreases.