Influence of pre-annealing before solution on microstructure and properties of 6111 aluminum alloy

doi:10.13251/j.issn.0254-6051.2021.10.028

Abstract

Abstract: Influence of pre-annealing before solution treatment on microstructure and mechanical properties of cold rolled and T4P state 6111 aluminum was investigated. The mechanical properties were tested, the LDR value was calculated, and microstructure was characterized by means of optical microscopy and scanning electronic microscopy (SEM). The texture was tested by using XRD. The results indicate that pre-annealing temperature has little effect on yield strength, but the tensile strength decreases from 245 MPa to 230 MPa after annealing at 300 ℃ for 2 h. The elongation decreases sharply when pre-annealing temperature is higher than 100 ℃. The n and r value increase first and then decrease with the increase of pre-annealing temperature. n value reaches the peak(0.289) at 200 ℃ and r value reaches the peak (0.958) at 100 ℃. LDR value reaches the peak value of 2.005 after 200 ℃×2 h pre-annealing. The grain size of T4P state alloy after pre-annealing at 300 ℃ for 2 h ranges from 60 μm to 150 μm. The volume fraction of Cube texture of T4P state alloy after pre-annealing at 200 ℃ for 2 h reaches the peak value of 13.5%.

Key words: pre-annealing, 6111 aluminum alloy, microstructure, properties

CLC Number:

TG156.1

Li Dalin, Zhu Pengcheng, Wang Ping, Lü Zhengfeng, Zhang Shanshun. Influence of pre-annealing before solution on microstructure and properties of 6111 aluminum alloy[J]. Heat Treatment of Metals, 2021, 46(10): 163-167.

References

[1]Cole G S, Sherman A M. Light weight materials for automotive applications[J]. Materials Characterization, 1995, 35(1): 3-9.
[2]Hirsch J. Recent development in aluminium for automotive applications[J]. Transactions of Nonferrous Metals Society of China, 2014, 24(7): 1995-2002.
[3]Miller W S, Zhuang L, Bottema J, et al. Recent development in aluminium alloys for the automotive industry[J]. Materials Science and Engineering: A, 2000, 280(1): 37-49.
[4]Hirsch J, Al-Samman T. Superior light metals by texture engineering: Optimized aluminum and magnesium alloys for automotive applications[J]. Acta Materialia, 2013, 61(3): 818-843.
[5]刘秋平, 刘志勇, 赵俊, 等. Zn含量及回归热处理对7075铝合金性能的影响[J]. 金属热处理, 2016, 41(2): 11-15.
Liu Qiuping, Liu Zhiyong, Zhao Jun, et al. Effect of Zn content and retrogression and re-aging treatment on properties of 7075 aluminum alloy[J]. Heat Treatment of Metals, 2016, 41(2): 11-15.
[6]Pogatscher S, Antrekowitsch H, Leitner H, et al. Mechanisms controlling the artificial aging of Al-Mg-Si alloys[J]. Acta Materialia, 2011, 59(9): 3352-3363.
[7]李辉, 李铸铁, 晋宏炎, 等. 预时效及烤漆硬化处理对6016铝合金显微组织及硬度的影响[J]. 金属热处理, 2017, 42(11): 148-151.
Li Hui, Li Zhutie, Jin Hongyan, et al. Influence of pre-aging and bake hardening on microstructure and hardness of 6016 aluminum alloy[J]. Heat Treatment of Metals, 2017, 42(11): 148-151.
[8]Yin D Y, Xiao Q, Chen Y Q, et al. Effect of natural ageing and pre-straining on the hardening behaviour and microstructural response during artificial ageing of an Al-Mg-Si-Cu alloy[J]. Materials & Design, 2016, 95: 329-339.
[9]Takaki Y, Aruga Y, Kozuka M, et al. Effects of pre-aging and natural aging on bake hardening behavior in Al-Mg-Si alloys[J]. Materials Science Forum, 2014, 794: 1026-1031.
[10]Matsuda K, Sakaguchi Y, Miyata Y, et al. Precipitation sequence of various kinds of metastable phases in Al-1.0mass%Mg₂Si-0.4mass%Si alloy[J]. Journal of Materials Science, 2000, 35(1): 179-189.
[11]Muhammad W, Ali U, Brahme A P, et al. Experimental analyses and numerical modeling of texture evolution and the development of surface roughness during bending of an extruded aluminum alloy using a multiscale modeling framework[J]. International Journal of Plasticity, 2017, 117: 93-121.

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