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| EFFECT OF Zr ON PRECIPITATION AND STRUCTURE PARAMETERS OF Al-Zn-Mg ALLOY |
| by LIN Zhaoqi;ZHAO Gang;SUN Guijing;YANG Shengkun Northeast Institute of Technology; Shenyang |
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Cite this article:
by LIN Zhaoqi;ZHAO Gang;SUN Guijing;YANG Shengkun Northeast Institute of Technology; Shenyang. EFFECT OF Zr ON PRECIPITATION AND STRUCTURE PARAMETERS OF Al-Zn-Mg ALLOY. Acta Metall Sin, 1985, 21(6): 7-108.
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Abstract 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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Received: 18 June 1985
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