电脉冲时效时间对Al-7Si-0.55Mg合金组织和性能的影响

张雷; 康凯娇; 石德全

doi:10.15980/j.tzzz.2021.12.010

研究·合金性能 | 浏览量 : 0 下载量: 18 CSCD: 0

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电脉冲时效时间对Al-7Si-0.55Mg合金组织和性能的影响
Effects of Electric Pulse Aging Time on Microstructure and Properties of Al-7Si-0.55Mg Alloy
2021年41卷第12期页码：1499-1503
纸质出版日期： 2021 ，
DOI： 10.15980/j.tzzz.2021.12.010

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张雷, 康凯娇, 石德全. 电脉冲时效时间对Al-7Si-0.55Mg合金组织和性能的影响[J]. 特种铸造及有色合金杂志, 2021,41(12):1499-1503.

Zhang Lei, Kang Kaijiao, Shi Dequan. Effects of Electric Pulse Aging Time on Microstructure and Properties of Al-7Si-0.55Mg Alloy[J]. Special Casting & Nonferrous Alloys, 2021,41(12):1499-1503.
张雷, 康凯娇, 石德全. 电脉冲时效时间对Al-7Si-0.55Mg合金组织和性能的影响[J]. 特种铸造及有色合金杂志, 2021,41(12):1499-1503. DOI： 10.15980/j.tzzz.2021.12.010.

Zhang Lei, Kang Kaijiao, Shi Dequan. Effects of Electric Pulse Aging Time on Microstructure and Properties of Al-7Si-0.55Mg Alloy[J]. Special Casting & Nonferrous Alloys, 2021,41(12):1499-1503. DOI： 10.15980/j.tzzz.2021.12.010.

摘要

以Al-7Si-0.55Mg合金为研究对象

在时效过程中施加电脉冲

保持脉冲电流、脉冲频率及占空比一定

改变时效时间进行试验。结果表明

Al-7Si-0.55Mg合金通过电脉冲时效能有效地缩短时效时间

使合金进行快速时效。与常规热处理相比

Al-7Si-0.55Mg合金经过电脉冲时效处理(4～7 h)后的硬度和电导率显著提高。电脉冲时效处理5 h后合金的伸长率为3.15%

高于常规热处理的3%

时效时间缩短3 h。获得了Al-7Si-0.55Mg合金的最佳电脉冲时效工艺参数:脉冲电流为8 A、脉冲频率为700 Hz、占空比为0.5、时效温度为160℃、时效保温为5 h。

Abstract

The electric pulse was applied on Al-7 Si-0.55 Mg alloy during the aging process with the fixed pulse current

pulse frequency and duty ratio

and variable aging time. The results indicate that the aging time of Al-7 Si-0.55 Mg alloy can be effectively shortened by electric pulse

leading to the rapidly aging. Compared with conventional heat treatment

the hardness and electrical conductivity of Al-7 Si-0.55 Mg alloy are significantly improved after electric pulse aging treatment for 4～7 h. The elongation is 3.15% after electric pulse aging treatment for 5 h

which is higher than that of 3% of ones after conventional heat treatment

and the aging time is shortened by 3 h. The optimum process parameters of Al-7 Si-0.55 Mg alloy can be presented as follows: pulse current of 8 A

pulse frequency of 700 Hz

duty ratio of 0.5

aging temperature of 160 ℃ and aging holding time of 5 h.