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符师桦,蔡玉龙,张青川,伍小平.自然时效对6061铝合金锯齿形屈服的影响[J].稀有金属材料与工程(英文),2017,46(12):3728~3732.[Fu Shihua,Cai yulong,Zhang Qingchuan and Wu Xiaoping.Study on the influence of nature aging on serrated yielding of 6061 Al-based alloy[J].Rare Metal Materials and Engineering,2017,46(12):3728~3732.]
Study on the influence of nature aging on serrated yielding of 6061 Al-based alloy
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Received:March 12, 2016  Revised:June 12, 2016
DOI:
Key words: Portevin-Le Chatelive effect  dynamic strain aging  6061 Al-based alloy  nature aging
Foundation item:国家自然科学基金资助(项目号11332010、51271174、 51571013)
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Fu Shihua,Cai yulong,Zhang Qingchuan and Wu Xiaoping  
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Abstract:
      The influence of nature aging (NA) on the Portevin-Le Chatelive (PLC) effect was investigated via tension tests in solution treated 6061 Al alloy. The yielding strength, the tensile strength, the critical strain and the serration period changed little in the NA time range of 0~1 h and then increased with increasing NA time. The serration amplitude decreased in the NA time range of 0~2 h and kept constant over 2 h. The precipitation sequence of the alloy suggests that the precipitates that can significantly strengthen the alloy formed after NA for 1 h and increased linearly with NA time. These precipitates inhibit the dislocation motion and result in shortening the waiting time. It is more difficult to produce the pinning process and thus the serration period and the critical strain increase. Moreover, the solute atoms gather to mobile dislocations by body diffusion rather than pipe diffusion in this alloy.