首页|回归温度和时间对深冷变形7A85铝合金显微组织、力学性能和腐蚀行为的影响

回归温度和时间对深冷变形7A85铝合金显微组织、力学性能和腐蚀行为的影响

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为了平衡合金的强度、塑性与耐蚀性,在不同回归温度和时间条件下对深冷变形7A85铝合金的显微组织和综合性能进行研究.结果表明,在较低回归温度和时间的回归再时效(RRA)制度和T6(120 ℃,24 h)制度下,合金具有较高的强度,但耐蚀性较差.对于RRA,在一定范围内增加回归温度和时间会降低合金的强度,但合金的电导率和耐蚀性显著提高.然而,过度地增加回归温度和时间使合金的耐蚀性降低.相同的回归温度下,随着回归时间的延长,合金的伸长率先减小后增大.与三向深冷变形7A85铝合金的最佳匹配的制度为RRA180-0.5((120 ℃,24 h)+(180 ℃,0.5 h)+(120 ℃,24 h)).
Influence of retrogression temperature and time on microstructure,mechanical properties and corrosion behaviors of cryogenically-deformed 7A85 aluminum alloy
To balance the strength,plasticity,and corrosion resistance of the alloy,the microstructure and comprehensive properties of cryogenically-deformed 7A85 aluminum alloy at various retrogression temperatures and time were investigated.The results showed that under the retrogression and re-aging(RRA)of lower retrogression temperature and time and T6(120 ℃,24 h)tempers,the alloy had higher strength but poorer corrosion resistance.For RRA,increasing the retrogression temperature and time within a certain range reduced the strength but significantly improved the electrical conductivity and corrosion resistance of the alloy.However,excessively increasing the retrogression temperature and time led to a reduction in corrosion resistance.At the same retrogression temperature,the elongation of the alloy first decreased and then increased with the extension of retrogression time.The optimal temper matched to the three-dimensional cryogenically deformed 7A85 aluminum alloy was RRA180-0.5((120 ℃,24 h)+(180 ℃,0.5 h)+(120 ℃,24 h)).

cryogenically-deformed 7A85 aluminum alloyretrogression temperatureretrogression timestrengthcorrosion resistanceoptimal temper

王当、张文学、易幼平、黄始全、何海林、张京京

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中南大学轻合金研究院,长沙 410083

中南大学高性能复杂制造国家重点实验室,长沙 410083

首都航天机械有限公司,北京 100076

中南大学机电工程学院,长沙 410083

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深冷变形7A85铝合金 回归温度 回归时间 强度 耐蚀性 最佳制度

National Natural Science Foundation of ChinaGeneral Program of Natural Science Foundation of Hunan Province,ChinaSouthwest Aluminum(group)Company Ltd

518755832020JJ4709

2024

10.1016/S1003-6326(23)66406-4

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(2)