Study on the influence of nature aging on serrated yielding of 6061 Al-based alloy

Home > Archive>Volume 46, Issue 12, 2017 >3728-3732

Study on the influence of nature aging on serrated yielding of 6061 Al-based alloy
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                        Fu ShihuaFu Shihua
CAS Key Laboratory of Mechanical Behavior and Design of Material,Department of Modern Mechanics,University of Science and Technology of China
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Cai yulongCai yulong
CAS Key Laboratory of Mechanical Behavior and Design of Material,Department of Modern Mechanics,University of Science and Technology of China
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Zhang QingchuanZhang Qingchuan
CAS Key Laboratory of Mechanical Behavior and Design of Material,Department of Modern Mechanics,University of Science and Technology of China
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Wu XiaopingWu Xiaoping
CAS Key Laboratory of Mechanical Behavior and Design of Material,Department of Modern Mechanics,University of Science and Technology of China
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Affiliation:CAS Key Laboratory of Mechanical Behavior and Design of Material,Department of Modern Mechanics,University of Science and Technology of China,CAS Key Laboratory of Mechanical Behavior and Design of Material,Department of Modern Mechanics,University of Science and Technology of China,CAS Key Laboratory of Mechanical Behavior and Design of Material,Department of Modern Mechanics,University of Science and Technology of China,CAS Key Laboratory of Mechanical Behavior and Design of Material,Department of Modern Mechanics,University of Science and Technology of China
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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.

Key words:Portevin-Le Chatelive effect; dynamic strain aging; 6061 Al-based alloy; nature aging

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[Fu Shihua, Cai yulong, Zhang Qingchuan, 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.]
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Received:March 12,2016
Revised:June 12,2016
Adopted:December 06,2016
Online: January 04,2018
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