摘要
基于两次挤压处理后的喷射成形7055铝合金,采用SEM、光学显微镜、硬度仪和拉伸试验机等分析手段研究了试验合金在不同时效工艺下的组织和性能。结果表明,相较于单级时效工艺,经过120℃×6 h+160℃×2 h双级时效处理后,析出相呈短棒状均匀分布于基体,其沿长度方向上的平均尺寸为500 nm,宽度方向平均尺寸为10 nm,时效峰值硬度达196.4 HV0.05。采用双级时效工艺处理的试验合金在298、398、498和598 K的抗拉强度分别为855、792、688和360 MPa,断后伸长率分别为14%、11%、9%和8%。采用该双级时效处理工艺处理的喷射成形7055铝合金应用于轮毂紧固件产品的制备,并对其进行硫酸阳极氧化处理,可使得紧固件试样同时兼具高强度、高硬度以及高耐蚀性能,有望得到更广泛的应用。
Based on the spray-formed 7055 aluminum alloy after twice extrusion treatment, the microstructure and properties of the tested alloy under different aging processes were studied by means of SEM, optical microscope, hardness tester and tensile testing machine. The results show that compared with the single-stage aging process, after two-stage aging treatment at 120 ℃ for 6 h and at 160 ℃ for 2 h, the precipitates are uniformly distributed in the matrix with shape of short rod, which the average size along the length and width direction is 500 nm and 10 nm, respectively, and the aging peak hardness is 196.4 HV0.05. The tensile strength of the tested alloy treated by two-stage aging process at 298, 398, 498 and 598 K is 855, 792, 688 and 360 MPa, respectively, and the elongation after fracture is 14%, 11%, 9% and 8%, respectively. The spray-formed 7055 aluminum alloy treated by the two-stage aging treatment process is applied to the preparation of hub fastener products, and is subjected to sulfuric acid anodizing treatment, which can make the fastener specimens have high strength, high hardness and high corrosion resistance at the same time, and it is expected to be more widely used.
作者
王佳慧
陈文浩
张玉
江卓奥
王庆航
赵玲玉
Wang Jiahui;Chen Wenhao;Zhang Yu;Jiang Zhuoao;Wang Qinghang;Zhao Lingyu(College of Mechanical Engineering,Yangzhou University,Yangzhou Jiangsu 225127,China;Jiangsu Haoran Spray Forming Alloy Co.,Ltd.,Zhenjiang Jiangsu 212009,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2022年第1期239-244,共6页
Heat Treatment of Metals
基金
国家自然科学基金青年项目(51901202)。
关键词
7055铝合金
喷射成形
双级时效
显微组织
力学性能
7055 aluminum alloy
spray-formed
two-stage aging
microstructure
mechanical properties