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| EFFECT OF Ti ON PRECIPITATION AND MICROSTRUCTURAL PARAMETERS OF AN Al-Zn-Mg ALLOY |
| LIN Zhaoqi; ZHAO Gang (Northeast Institute of Technology; Shenyang) (Manuscript received 1 August; 1985) |
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Cite this article:
LIN Zhaoqi; ZHAO Gang (Northeast Institute of Technology; Shenyang) (Manuscript received 1 August; 1985). EFFECT OF Ti ON PRECIPITATION AND MICROSTRUCTURAL PARAMETERS OF AN Al-Zn-Mg ALLOY. Acta Metall Sin, 1987, 23(2): 129-241.
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Abstract The effect of an additive of 0.15 wt-% Ti in the Al-5.0Zn-1.8Mg alloy upon the precipitation, critical nucleation temperature, T'_c, and structural parameters has been investigated by means of hardness test as well as optical and TEM observations. The results showed that a trace additive of Ti may impel considerably the refinement of the grains of the alloy, but no more inhibition of its recrystallization and increase of T'_c.Ti may retard the growth of MPt, increase the density and the hardness of the alloy under lower temperature aging, namely, T_a T'_c. Furthermore, at any aging temperature between 120-200℃, the GBP and PFZ of the Ti-containing alloy are always finer and narrower than that of one free from Ti. It seems to be explained that influence of Ti addition on the precipitation and structural parameters would be caused by the participation of the Ti atom clusters in the nucleation of GP zone and the low concentration of excess vacancies in the Ti-containing alloy.
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Received: 18 February 1987
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