微量Cr对工业纯Al-5.0Zn-1.8Mg合金沉淀过程和显微组织参数的影响

金属学报

1983, Vol. 19

Issue (3): 37-150

论文

本期目录 | 过刊浏览

微量Cr对工业纯Al-5.0Zn-1.8Mg合金沉淀过程和显微组织参数的影响

林肇琦;封冰;孙贵经;杨胜坤

东北工学院;东北工学院;东北工学院;东北工学院

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)

引用本文:

林肇琦;封冰;孙贵经;杨胜坤. 微量Cr对工业纯Al-5.0Zn-1.8Mg合金沉淀过程和显微组织参数的影响[J]. 金属学报, 1983, 19(3): 37-150.
, , , . EFFECT OF TRACE Cr ON PRECIPITATION AND MICROSTRUCTURAL PARAMETERS OF A COMMERCIAL PURITY Al-5.0Zn-1.8Mg ALLOY[J]. Acta Metall Sin, 1983, 19(3): 37-150.

全文: PDF(2866 KB)

摘要: 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。

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.

收稿日期: 1983-03-18

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