本文利用硬度、显微镜和透射电镜系统地研究了微量Cr对工业纯Al-5.0Zn-1.8Mg合金的沉淀过程、临界形核温度T_c~′和组织参数的影响。结果表明,Cr是促进不均匀沉淀和提高T_c~′温度的元素。低温时效(T_a≤160℃)能抑制晶界沉淀桕(GBP)、无沉淀带(PFZ)和基体沉淀相(MPt)的长大;但高温时效(T_a≥180℃)它又能促进这些参数的强烈长大。这些变化特点,可用Cr与过剩空位交互作用的双重性机理来说明。
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.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] | |
| [12] | |
| [13] | |
| [14] | |
| [15] | |
| [16] | |
| [17] | |
| [18] | |
| [19] | |
| [20] | |
| [21] |
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