Effect of solution treatment on microstructure and mechanical properties of 7175 aluminum alloy

doi:10.13251/j.issn.0254-6051.2024.05.031

Abstract

Abstract: Effect of solution treatment process on microstructure and properties of 7175 aluminum alloy was investigated through tensile property testing,hardness testing,optical microscope(OM),scanning electron microscope(SEM) and transmission electron microscope (TEM). The results show that when the 7175 aluminum alloy is solution treated at 485 ℃ for 3.5 h,the second phase contont gradually decreases, and there is a tendency for grain coarsening. When the 7175 aluminum alloy is solution treated at 475 ℃ for 2.5 h,MgZn₂ phase will rely on the Cr containing phase to nucleate at the grain boundary, playing a role in pinning the grain boundary and inhibiting grain growth. At the same time, with the increase of solution temperature and time, the tensile strength and microhardness of the alloy after aging at 120 ℃ for 12 h and 165 ℃ for 5.5 h show a trend of first increasing and then decreasing. When the solution treatment process is 475 ℃×2.5 h,the tensile strength is 631.2 MPa, the yield strength is 555.7 MPa and the elongation is 12.5%, with the optimal comprehensive mechanical properties.

Key words: aluminum alloy, microstructure, solution treatment, mechanical properties

CLC Number:

TG146.2

Zhao Zhongchao, Ji Qingtao, Cao Shanpeng, Tang Hezhuang, Li Binliang, Niu Boya, Sun Youzheng. Effect of solution treatment on microstructure and mechanical properties of 7175 aluminum alloy[J]. Heat Treatment of Metals, 2024, 49(5): 186-192.

References

[1]Geng H C, Wang Y L, Zhu B, et al. Effect of solution treatment time on plasticity and ductile fracture of 7075 aluminum alloy sheet in hot stamping process[J]. Transactions of Nonferrous Metals Society of China, 2022, 32(11): 3516-3533.
[2]郑可, 李传维, 顾剑锋. 固溶态和时效态7075铝合金的微纳米压痕力学行为[J]. 材料热处理学报, 2023, 44(1): 39-48.
Zheng Ke, Li Chuanxiong, Gu Jianfeng. Micro-nano indentation mechanical behavior of 7075 aluminum alloy in solution and aging states[J]. Transactions of Materials and Heat Treatment, 2023, 44(1): 39-48.
[3]余代尧, 黄兴民, 赵君文, 等. 固溶温度对7A85铝合金显微组织和断裂机理的影响[J]. 材料热处理学报, 2022, 43(12): 36-44.
Yu Daiyao, Huang Xingmin, Zhao Junwen, et al. Effect of solution temperature on microstructure and fracture mechanism of 7A85 aluminum alloy[J]. Transactions of Materials and Heat Treatment, 2022, 43 (12): 36-44.
[4]马冬威, 张春, 张元好, 等. 固溶工艺对6061铝合金组织和拉伸性能的影响[J]. 金属热处理, 2020, 45(5): 74-77.
Ma Dongwei, Zhang Chun, Zhang Yuanhao, et al. Effect of solution process on microstructure and tensile properties of 6061 aluminum alloy[J]. Heat Treatment of Metals, 2020, 45(5): 74-77.
[5]王逸飞, 张艳, 王振旭, 等. 热处理对氮间隙固溶CoCrFeMnNi高熵合金组织及性能的影响[J]. 特种铸造及有色合金, 2022, 42(1): 55-59.
Wang Yifei, Zhang Yan, Wang Zhenxu, et al. Effect of heat treatment on microstructure and properties of nitrogen interstitial solution high entropy alloy[J]. Special Casting and Nonferrous Alloys, 2022, 42(1): 55-59.
[6]Abdi M, Shabestari S G. Novel high strength Al-10.5Si-3.4Cu-0.2Mg alloy produced through two-stage solution heat treatment[J]. Transactions of Nonferrous Metals Society of China, 2021, 31(3): 576-585.
[7]Song W W, Pu J F, Wang H F, et al. Effect of solid-solution process on the properties of 7050 aluminum alloy[J]. Key Engineering Materials, 2020, 866: 63-71.
[8]王国军, 熊柏青, 张永安, 等. 固溶热处理对2D70合金挤压棒材组织与性能的影响[J]. 金属热处理, 2010, 35(3): 37-42.
Wang Guojun, Xiong Baiqing, Zhang Yongan, et al. Effect of solution treatment on microstructure and properties of 2D70 alloy extruded rod[J]. Heat Treatment of Metals, 2010, 35(3): 37-42.
[9]陈由红, 兰博, 孙兴, 等. 固溶处理对挤压/等温锻复合工艺制备的GH710合金组织与性能的影响[J]. 材料热处理学报, 2020, 41(8): 42-48.
Chen Youhong, Lan Bo, Sun Xing, et al. Effect of solid solution treatment on microstructure and properties of GH710 alloy prepared by extrusion/isothermal forging process[J]. Transactions of Materials and Heat Treatment, 2020, 41(8): 42-48.
[10]王琛, 刘文博, 李涛. 热处理对航空用TC4合金组织与性能的影响[J]. 金属热处理, 2018, 43(8): 107-110.
Wang Chen, Liu Wenbo, Li Tao. Effect of heat treatment on microstructure and mechanical properties of TC4 alloy for aviation application[J]. Heat Treatment of Metals, 2018, 43(8): 107-110.
[11]孙文超. 固溶处理后7055铝合金的摩擦磨损性能研究[J]. 世界有色金属, 2022(21): 139-141.
Sun Wenchao. Friction and wear properties of 7055 aluminum alloy after solution treatment[J]. World Nonferrous Metals, 2022(21): 139-141.
[12]李惠曲, 邢清源, 饶茂, 等. 超高强度7A36铝合金挤压管材热处理工艺研究[J]. 材料工程, 2023, 51(4): 113-121.
Li Huiqu, Xing Qingyuan, Rao Mao, et al. Heat treatment of ultrahigh strength 7A36 aluminum alloy extruded tube[J]. Journal of Materials Engineering, 2023, 51(4): 113-121.
[13]欧奕孜, 江勇. 7系铝合金η′→η₂相转变过程中主元素的作用[J]. 中国有色金属学报, 2022, 32(8): 2222-2230.
Ou Yizi, Jiang Yong. Effects of major alloying elements on η′→η₂ phase transformation in 7××× Al alloys[J]. The Chinese Journal of Nonferrous Metals, 2022, 32(8): 2222-2230.
[14]刘世雷, 陈雷, 刘洪雷, 等. 7B04铝合金特殊用途板材的热处理技术研究[J]. 轻合金加工技术, 2022, 50(6): 37-40.
Liu Shilei, Chen Lei, Liu Honglei, et al. Study on heat treatment technology of 7B04 aluminum alloy special-purpose sheet[J]. Light Alloy Fabrication Technology, 2022, 50(6): 37-40.
[15]张晗, 郝启堂, 李新雷, 等. 热处理工艺对Al-Cu-Mn-Mg合金微观组织与力学性能的影响[J]. 材料热处理学报, 2023, 44(3): 58-67.
Zhang Han, Hao Qitang, Li Xinlei, et al. Effect of heat treatment on microstructure and mechanical properties of Al-Cu-Mn-Mg alloy[J]. Transactions of Materials and Heat Treatment, 2023, 44(3): 58-67.
[16]潘仁杰, 陈康敏, 郭辉, 等. 固溶处理时间对Al-5.7Zn-0.7Mg铝合金型材组织及压溃性能的影响[J]. 金属热处理, 2021, 46(10): 101-107.
Pan Renjie, Chen Kangmin, Guo Hui, et al. Effect of solid solution time on microstructure and crushing performance of Al-5.7Zn-0.7Mg aluminum alloy profiles[J]. Heat Treatment of Metals, 2021, 46(10): 101-107.
[17]刘萌, 李新亚, 臧勇, 等. 固溶成形工艺对6016铝合金组织及力学性能的影响[J]. 金属热处理, 2023, 48(2): 138-143.
Liu Meng, Li Xinya, Zang Yong, et al. Effect of solution forming process on microstructure and mechanical properties of 6016 aluminum alloy[J]. Heat Treatment of Metals, 2023, 48(2): 138-143.