Tensile fracture analysis of 5B70 aluminum alloy under different strain rates

doi:10.13251/j.issn.0254-6051.2020.03.046

Abstract

Abstract:

Tensile fractures of 5B70 aluminum alloy at different strain rates were investigated. The results show that as the strain rate increases, the elongation of the alloy decreases. Fracture analysis shows that the lower the strain rate, the greater are the number of dimples in the fracture and the deeper depth, showing obvious high ductile fracture. With the increase of strain rate, the quasi-cleavage plane appears, the alloy is biased towards brittle fracture. Secondary cracks also occur at lower strain rates. As the strain rate increases, the grain elongation on the side of the alloy fracture decreases, and a fine precipitate phase appears.

Key words: 5B70 aluminum alloy, strain rate, microstructure, quasi-cleavage fracture, fracture analysis

CLC Number:

TG115.5

Zhou Wei, Jiang Feng, Lai Songbai, Fang Jie, Tong Mengmeng. Tensile fracture analysis of 5B70 aluminum alloy under different strain rates[J]. HTM, 2020, 45(3): 231-234.

References

[1]尹志民, 姜锋, 潘清林. 钪和含钪合金[M]. 长沙: 中南大学出版社, 2007.
[2]Kulitskiy V, Malopheyev S, Mironov S, et al. Grain refinement in an Al-Mg-Sc alloy: Equal channel angular pressing versus friction-stir processing[J]. Materials Science and Engineering A, 2016, 674(1): 480-490.
[3]颜丝, 尹志民, 路丽英, 等. 稳定化退火对大生产条件下制备的5B70铝合金板材组织和性能的影响[J]. 轻合金加工技术, 2009, 37(12): 19-22.
Yan Si, Ying Zhimin, Lu Liying, et al. Effect of stabilized annealing on microstructure and properties of manufacture Al-Mg-Sc alloy sheet under conditions of large-scale production[J]. Light Alloy Fabrication Technology, 2009, 37(12): 19-22.
[4]Malopheyev S, Kulitskiy V, Mironov S, et al. Friction-stir welding of an Al-Mg-Sc-Zr alloy in as-fabricated and work-hardened conditions[J]. Materials Science and Engineering A, 2014, 600(5): 159-170.
[5]聂波, 尹志民, 姜锋, 等. 稳定化退火工艺对铝镁钪合金力学和腐蚀性能的影响[J]. 材料热处理学报, 2008, 29(3): 58-61.
Nie Bo, Ying Zhimin, Jiang Feng, et al. Influence of stabilizing annealing on tensile property and exfoliation corrosion resistance of Al-Mg-Sc alloy[J]. Transactions of Materials and Heat Treatment, 2008, 29(3): 58-61.
[6]Kumar N, Mishra R S. Additivity of strengthening mechanisms in ultrafine grained Al-Mg-Sc alloy[J]. Materials Science and Engineering A, 2013, 580(37): 175-183.
[7]Smolej A, Klob Ar D, Skaza B, et al. Superplasticity of the rolled and friction stir processed Al-4.5Mg-0.35Sc-0.15Zr alloy[J]. Materials Science and Engineering A, 2014, 590(1): 239-245.
[8]孙雪, 潘清林, 李梦佳, 等. Al-Mg-Sc-Zr合金冷轧板材的超塑性变形行为[J]. 中国有色金属学报, 2016, 26(2): 280-287.
Sun Xue, Pan Qinglin, Li Mengjia, et al. Superplastic deformation behavior of cold-rolled Al-Mg-Sc-Zr alloy sheet[J]. The Chinese Journal of Nonferrous Metals, 2016, 26(2): 280-287.
[9]刘辉, 姜锋, 刘乐乐, 等. 5B70铝合金板材腐蚀性能的研究[J]. 轻合金加工技术, 2014, 42(10): 30-35.
Liu Hui, Jiang Feng, Liu Lele, et al. Research on the corrosion performance of 5B70 aluminum alloy sheets[J]. Light Alloy Fabrication Technology, 2014, 42(10): 30-35.
[10]方杰, 徐翩, 刘刚, 等. 5B70铝合金板材疲劳裂纹萌生与扩展机制[J]. 材料热处理学报, 2017, 38(10): 51-56.
Fang Jie, Xue Pian, Liu Gang, et al. Fatigue crack initiation and propagation mechanism of 5B70 aluminum alloy plate[J]. Transactions of Materials and Heat Treatment, 2017, 38(10): 51-56.
[11]孙瑞雪, 徐磊. 不同应变速率下 5083 铝合金的拉伸性能及断口形貌观察[J]. 轻金属, 2012, 12(8): 59-61.
Sun Ruixue, Xu Lei. The tensile properties and fracture morphologies of 5083 aluminum alloy under different strain rates[J]. Light Metals, 2012, 12(8): 59-61.
[12]高倩倩, 胡本润, 杨伟. 应变速率对2024铝合金拉伸性能的影响研究[J]. 热加工工艺, 2014, 43(12): 113-116.
Gao Qianqian, Hu Benrun, Yang Wei. Effect of strain rate on mechanical properties of 2024 alloy[J]. Hot Working Technology, 2014, 43(12): 113-116.
[13]刘军, 杨黎明, 谢书港, 等. 6061 铝合金的动态拉伸性能及其本构模型[J]. 机械工程材料, 2017, 41(3): 49-52.
Liu Jun, Yang Liming, Xie Shugang, et al. Dynamic tensile properties and constitutive model of 6061 aluminum alloy[J]. Materials for Mechanical Engineering, 2017, 41(3): 49-52.
[14]张臻, 邓运来, 郭辉, 等. 应变速率对Al-Zn-Mg合金室温拉伸性能的影响[J]. 功能材料, 2017, 16(7): 215-220.
Zhang Zhen, Deng Yunlai, Guo Hui, et al. Effect of strain rate on tensile properties of Al-Zn-Mg alloy[J]. Journal of Functional Materials, 2017, 16(7): 215-220.
[15]王淑花, 安秀娟. 拉伸速率对2A40合金拉伸性能的影响[J]. 热加工工艺, 2012, 41(14): 72-73.
Wang Shuhua, An Xiujuan. Effect of tensile rate on tensile properties of 2A40 alloy[J]. Hot Working Technology, 2012, 41(14): 72-73.
[16]姜美琴. 金属材料室温拉伸试验影响因素浅析[J]. 江苏冶金, 2007, 35(2): 27-31.
[17]张志, 郎利辉, 李涛, 等. 高强度铝合金7B04-T6板材温拉伸本构方程[J]. 北京航空航天大学学报, 2009, 35(3): 600-603.
Zhang Zhi, Lang Lihui, Li Tao, et al. Constitutive equations of high strength aluminum alloy sheet 7B04-T6 under warm tension[J]. Journal of Beijing University of Aeronautics and Astronautics, 2009, 35(3): 600-603.
[18]Fields D S, Bachofen W A. Determination of strain hardening characteristics bt torsion testing[J]. Proc ASTM, 1957, 57(2): 1259-1272.