利用硬度计(HV)、光学显微镜和透射电镜系统地研究了微量Zr(0.22％)对Al—5.0Zn-1.75Mg合金的沉淀过程、临界形核温度T′_c和显微组织参数的影响,并与Mn,Cr,Cu的影响进行了比较。结果表明,Zr能明显提高再结晶温度和细化晶粒,但无提高T′_c的能力。低温时效(T_a≤160℃),Zr有抑制GBP、促进MPt长大和提高HV的作用;但高温时效(T_a≥180℃)又有促进这两种参数急剧长大和强烈降低HV的作用。在选定的时效条件下(120—200℃),含Zr合金的PFZ均比无Zr合金窄。文中还讨论了Zr对Al-Zn-Mg合金的作用机理问题。
The effect of 0.22% Zr, and in comparison with Mn, Cr or Cu in theauthors' previous works, on the precipitation, the critical nucleation temperature,T′_c, and the microstructure parameters of a commercial purity Al-5.0Zn-1.75Mgalloy has been studied by means of hardness test, optical microscopy and TEM.The results obtained showed that Zr is the element by which the recrystallizationtemperature of the alloy is substantially raised and the grain size is refined, butthe T′_c is not yet increased. When aged at temperature≤160℃, an additive ofZr in the alloy may inhibit GBP, promote MPt and increase HV. However, whenaged at temperature≥180℃, it may sharply increase these parameters and vio-lently decrease HV. The width of PFZ in the Zr-bearing alloy is always narrowerthan that in the Zr-free alloy under a selected aging condition at 120--200℃. Ithas also been tried to make approach to behaviour of Zr added in the alloy andto contrast among the additives Zr, Mn, Cr and Cu.
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