自然时效及预变形对Al-Cu-Mg合金力学性能的影响
首发时间:2020-03-06
摘要:为了研究Al-Cu-Mg合金在热处理工艺中固溶处理后放置于室温下的影响,本文研究了自然时效对Al-Cu-Mg合金人工时效后力学性能的影响,采用不同Cu/Mg比的Al-4Cu-1.6Mg、Al-4Cu-0.6Mg 、Al-4Cu-0.3Mg三种合金在经过自然时效5h和48h后再进行170℃人工时效,测定其硬度值,结果表明:自然时效5h与自然时效48h对随后人工时效的峰值硬度值影响不大;自然时效48h的Al-4Cu-1.6Mg合金在随后人工时效初期硬度值会下降;Al-4Cu-1.6Mg合金其峰值硬度要高于Cu/Mg比高的合金Al-4Cu-0.6Mg以及Al-4Cu-0.3Mg。此外,研究了预变形对自然时效合金硬度的影响,发现预变形量大的合金其位错密度高,促使合金人工时效初期硬度值高,峰值硬度也高,且达到峰值硬度所需的时效时间短。
关键词: Al-Cu-Mg合金 自然时效 硬度 人工时效 预变形
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The effect of natural age and pre-strain on the mechanical property of Al-Cu-Mg alloy
Abstract:In order to investigate the effect of natural ageing during the heat treatment process of Al-Cu-Mg alloy, Al-4Cu-1.6Mg, Al-4Cu-0.6Mg and Al-4Cu-0.3Mg alloys were investigated to make clear of the effect of natural ageing on the mechanical property of Al-Cu-Mg alloy. The three kinds of alloy with different Cu/Mg ratio were solution treated and followed by natural ageing for 5h or 48h, and then artificial aged. The results showed that there is no obvious difference of the hardness between naturally aged for 5h and 48h; the hardness decreases at the initial stage of the artificial age of Al-4Cu-1.6Mg alloy after naturally aged for 48h; the peak hardness of Al-4Cu-1.6Mg alloy is higher than that of Al-4Cu-0.6Mg and Al-4Cu-0.3Mg alloy. Besides, it is also studied the effect of the pre-strain on the hardness of naturally aged Al-4Cu-1.6Mg alloy. It is found that the hardness of the alloy with larger deformation is higher due to the higher dislocation density in the matrix of the alloy. Meanwhile, the time to reach to the peak is also shortened.
Keywords: Al-Cu-Mg alloy natural age hardness artificial age pre-strain
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