高强Al-Mg-Si-Cu铝合金的时效工艺研究  

Investigation on Aging Technology of High Strength Al-Mg-Si-Cu Aluminum Alloy

作　　者：张伟 朱科杰 ZHANG Wei;ZHU Kejie(Hunan Inno China Advanced Materials Co.,Ltd.,Hunan Yueyang 414000,China)

机构地区：[1]湖南中创空天新材料股份有限公司,湖南岳阳414000

出　　处：《精密成形工程》2024年第3期188-194,共7页Journal of Netshape Forming Engineering

摘　　要：目的研究时效工艺参数对高强Al-Mg-Si-Cu铝合金微观组织和力学性能的影响规律,以得到Al-Mg-Si-Cu铝合金时效后最优的性能和微观组织。方法在不同时效处理工艺参数条件下,通过对Al-Mg-Si-Cu铝合金时效处理后的硬度、电导率、室温力学性能进行测试与对比分析,并结合微观组织观察实验,分析了不同时效温度及时效时间对Al-Mg-Si-Cu铝合金时效强化相及力学性能的影响规律。结果在不同时效温度条件下,经不同时效时间的时效处理后,Al-Mg-Si-Cu铝合金的电导率随时效温度的升高和时间的延长而增大,当时效温度为170、180、190℃时,硬度和力学性能在时效时间为16、12、8h时达到峰值。同时,当时效时间为8、12、16 h时,Al-Mg-Si-Cu铝合金的时效强化相分别是β''相、β'相和Q'相;在峰值时效和过时效工况下,Al-Mg-Si-Cu铝合金的析出相均存在Q'相,该相对合金的强度具有明显的贡献。在过时效阶段,Al-Mg-Si-Cu铝合金强化相明显初化,力学性能和硬度均有明显降低。结论经淬火处理+180℃/12 h时效处理后,高强Al-Mg-Si-Cu铝合金的力学性能最优,抗拉强度和屈服强度分别为404 MPa和388MPa,硬度为136HV。The work aims to study the effects of aging processing parameters on microstructures and mechanical properties of Al-Mg-Si-Cu aluminum alloy to obtain the optional properties and microstructures of aged Al-Mg-Si-Cu aluminum alloy.Under the condition of different aging treatment parameters and based on the testing analysis of electrical conductivity,hardness and tensile properties as well as microstructural observation,the effects of aging time and temperature on the aging precipitation phases and mechanical properties were analyzed.Results showed that the electrical conductivity increased with the increase of aging temperature or aging time,when the Al-Mg-Si-Cu aluminum alloy was subject to aging treatment under different aging temperatures and aging time.When the aging temperature is 170,180,190℃,the peak values of electrical conductivity,hard-ness and tensile properties were reached at the aging temperatures of 16 h,12 h and 8 h,respectively.Meanwhile,the types of aging strengthening phases for the Al-Mg-Si-Cu aluminum alloy under aging temperatures of 16 h,12 h and 8 h wereβ''phase,β'phase and Q'phase,respectively.The Q'phase,which had a significant contribution to the strength of the Al-Mg-Si-Cu alu-minum alloy,could be founded under peak aging and over-aging treatments.Furthermore,the coarsening behaviors of aging precipitation phases occurred under the over-aging process,and then both the hardness and tensile properties were reduced.The mechanical properties of the Al-Mg-Si-Cu aluminum alloy under quenching treatment and aging treatment of 180℃/12 h are the best,and its tensile strength and yield strength are 404 MPa and 388 MPa,respectively.Moreover,the hardness was 136HV.

关 键 词：AL-MG-SI-CU合金 时效 析出相 弥散分布 

分 类 号：TG146.2[一般工业技术—材料科学与工程]