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| EFFECT OF TRACE Cr ON PRECIPITATION AND MICROSTRUCTURAL PARAMETERS OF A COMMERCIAL PURITY Al-5.0Zn-1.8Mg ALLOY |
| by LIN Zhaoqi; FUNG Bing; SUN Guijing; YANG Shengkun (Northeast Institute of Tecknology; Shenyang) |
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Cite this article:
by LIN Zhaoqi; FUNG Bing; SUN Guijing; YANG Shengkun (Northeast Institute of Tecknology; Shenyang). EFFECT OF TRACE Cr ON PRECIPITATION AND MICROSTRUCTURAL PARAMETERS OF A COMMERCIAL PURITY Al-5.0Zn-1.8Mg ALLOY. Acta Metall Sin, 1983, 19(3): 37-150.
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Abstract The effect of trace Cr on the precipitation, critical nucleation temperature T_c′ and structural parameters of a commercial purity Al-5.0Zn-1.8Mg alloy has been investigated by means of hardness test, optical microscopy and TEM. It was resulted that the trace Cr may facilitate the heterogeneous precipitation and the raise of T_c′, as well as may also retard the growth of GBP, PFZ and MPt after lower temperature aging (T_a≤160℃), however, it may accelerate them after aged under elevated temperature (T_a≥180℃). The above-mentioned behaviour seems to be explained by the dual mechanism of the interaction of Cr with vacancies.
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Received: 18 March 1983
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