时效对ADC12压铸铝合金组织和性能的影响

doi:10.13251/j.issn.0254-6051.2022.12.015

金属热处理 ›› 2022, Vol. 47 ›› Issue (12): 90-94.DOI: 10.13251/j.issn.0254-6051.2022.12.015

时效对ADC12压铸铝合金组织和性能的影响

马冬威¹, 李文巧², 张元好¹, 史秋月¹, 吴小峰¹, 吴成杰¹

1.湖北汽车工业学院材料科学与工程学院, 湖北十堰 442002;
2.东风(十堰)有色铸件有限公司, 湖北十堰 442003

收稿日期:2022-07-27 修回日期:2022-09-28 出版日期:2022-12-25 发布日期:2023-01-05
作者简介:马冬威(1983—),男,高级实验师,主要研究方向为金属材料及失效分析,E-mail:madongwei107@163.com
基金资助:
湖北省教育厅科研计划(B2020082);湖北汽车工业学院大学生创新训练计划(DC2020060)

Effect of aging on microstructure and properties of ADC12 die cast aluminum alloy

Ma Dongwei¹, Li Wenqiao², Zhang Yuanhao¹, Shi Qiuyue¹, Wu Xiaofeng¹, Wu Chengjie¹

1. College of Materials and Engineering, Hubei University of Automotive Technology, Shiyan Hubei 442002, China;
2. Dongfeng (Shiyan) Nonferrous Casting Co., Ltd., Shiyan Hubei 442003, China

Received:2022-07-27 Revised:2022-09-28 Online:2022-12-25 Published:2023-01-05

摘要/Abstract

摘要： 通过微观组织观察、拉伸性能测试和尺寸稳定性测试等研究了时效工艺对ADC12压铸铝合金微观组织、力学性能和尺寸稳定性的影响。结果表明,随时效时间或温度增加,合金内部逐渐弥散析出强化粒子相,合金强度呈上升趋势;进一步增加时效时间或温度,强化粒子相开始聚集长大,合金强度下降。在时效后的保温处理过程中,影响试样尺寸的因素主要有两个,一是残余应力,二是固态相变。时效温度较低或时间较短时,残余应力消除造成的试样尺寸变长占据主导地位,试样尺寸伸长。随时效时间或温度增加,固态相变造成的试样变短占据主导地位,试样尺寸变化由正值转为负值,即试样缩短。综合考虑合金的拉伸性能、经济效益及尺寸变化尽量小的原则,ADC12合金合适的时效工艺为200~220 ℃×4 h或220~240 ℃×2 h。

关键词: ADC12压铸铝合金, 时效工艺, 微观组织, 力学性能, 尺寸稳定性

Abstract: Effect of aging process on microstructure, mechanical properties and dimensional stability of ADC12 die cast aluminum alloy was studied by means of microscopy, tensile test and dimensional test. The results show that with the increase of aging time or temperature, strengthening particles are gradually dispersed and precipitated in the alloy, and the strength of the alloy tends to increase, with the further increase of aging time or temperature, the strengthened particles begin to aggregate and grow up, and the strength of the alloy decreases. In the heat preservation process after aging, there are two main factors affecting the specimen size, one is residual stress, the other is solid phase transformation. When the aging temperature is low or the aging time is short, the specimen size lengthening caused by residual stress relief is dominant, and the specimen size elongates. With the increase of aging time or temperature, the specimen length shortening caused by solid phase transformation is dominant. and the specimen size changes from positive value to negative value, that is the size shortens. Considering the tensile properties, economic benefits and the principle of minimizing size change of the alloy, the suitable aging process for the ADC12 alloy is 200-220 ℃×4 h or 220-240 ℃×2 h.

Key words: ADC12 die cast aluminum alloy, aging process, microstructure, mechanical properties, dimensional stability

中图分类号:

TG146.2

马冬威, 李文巧, 张元好, 史秋月, 吴小峰, 吴成杰. 时效对ADC12压铸铝合金组织和性能的影响[J]. 金属热处理, 2022, 47(12): 90-94.

Ma Dongwei, Li Wenqiao, Zhang Yuanhao, Shi Qiuyue, Wu Xiaofeng, Wu Chengjie. Effect of aging on microstructure and properties of ADC12 die cast aluminum alloy[J]. Heat Treatment of Metals, 2022, 47(12): 90-94.

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时效对ADC12压铸铝合金组织和性能的影响

Effect of aging on microstructure and properties of ADC12 die cast aluminum alloy

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