锻压技术

7050铝合金热变形程度对再结晶及其性能的影响

英文标题：Influence of hot deformation degree on recrystallization and properties of aluminum alloy 7050

作者：李兵李忠文刘伟李春明邓运来张劲

分类号：TG31

出版年,卷(期):页码：2017,42(12):128-134

摘要：

7050铝合金热变形过程中变形程度对再结晶有重要的影响，而其各项性能与再结晶程度有关。厚度为40 mm的7050铝合金板材在410 ℃，以1 mm·s-1的速度分别压至25，20，15和10 mm。不同热变形程度的试样固溶、时效后，观察其金相组织、透射形貌，检测其硬度、电导率、室温拉伸、疲劳及晶间腐蚀性能等。实验结果表明，7050铝合金随着热压过程中变形程度的增加，再结晶程度逐渐上升。变形程度的增加使得再结晶晶粒增多，从而7050铝合金各项力学性能得到显著地提高，其中维氏硬度提高26 HV，屈服强度及抗拉强度分别提高36和51 MPa，疲劳断裂循环次数提高376万次，但抗腐蚀性能稍有下降。

The deformation degree of aluminum alloy 7050 in the hot deformation has important influence on recrystallization, and its properties relate to the degree of recrystallization. Then, aluminum alloy 7050 sheets with 40 mm thickness were pressed to 25, 20, 15 and 10 mm at 410 ℃,10 mm·s-1. Furthermore, the microstructure, transmission topography, hardness, electrical conductivity, room temperature tensile properties, fatigue properties and intergranular corrosion properties of specimens with different thermal deformation degrees were investigated after solid solution and aging treatment. The experimental results show that the recrystallization increases gradually with the increase of the deformation degree during the hot compressing of aluminum alloy 7050. However, the increasing deformation degree increases the number of fine recrystallized grains, and the mechanical properties of aluminum alloy 7050 are remarkably improved as the Vickers hardness increases by 26 HV, the yield strength and tensile strength increase by 36 and 51 MPa respectively, and the number of fatigue fracture cycles increases by 3.76 million times, but the corrosion resistance decreases slightly.

基金项目：

国家重点基础研究发展计划（2012CB619500）；国家重点研发计划（2016YFB0300901）；国家自然科学基金资助项目（51375503）；广西重大专项计划（14122001-5）；汽车轻量化和智能手机用新型高强韧铝合金材料的开发和应用（422190016）

作者简介：李兵(1976-)，男，学士，高级工程师 E-mail：zjh_aluminium@163.com 通讯作者：李春明(1990-)，男，硕士研究生 E-mail：1582756504@qq.com

参考文献：

［1］雷彬彬, 周志明, 黄伟九,等. Al-Cu-Mg高强铝合金的研究进展[J]. 热加工工艺, 2012, 41(2):41-45.

Lei B B, Zhou Z M, Huang W J, et al. Development of high-strength Al-Cu-Mg alloy[J]. Hot Working Technology, 2012,41(2): 41-45.

［2］Heinz A, Haszler A, Keidel C, et al. Recent development in aluminium alloys for aerospace applications[J]. Materials Science & Engineering A, 2000, 280(1):102-107.

［3］Williams James C, Starke Jr Edgar A. Progress in structural materials for aerospace systems [J].Acta Materialia, 2003, 51(19): 5775-5799.

［4］Jr E A S, Staley J T. Application of modern aluminum alloys to aircraft[J]. Progress in Aerospace Sciences, 1996, 32(2): 131-172.

［5］Rajamuthamilselvan M, Ramanathan S. Hot deformation behaviour of 7075 alloy[J]. Journal of Alloys & Compounds, 2011, 509(3): 948-952.

［6］Jin N, Zhang H, Han Y, et al. Hot deformation behavior of 7150 aluminum alloy during compression at elevated temperature[J]. Materials Characterization, 2009, 60(6): 530-536.

［7］孙茂银, 赵一生, 姜科达,等. 锻压温度对Cr12Mo1V1组织性能的影响[J]. 锻压技术, 2017, 42(3):130-136.

Sun M Y, Zhao Y S, Jiang K D, et al. Influence forging temperature on the microstructure and properties of Cr12Mo1V1[J]. Forging & Stamping Technology, 2017, 42(3): 130-136.

［8］Quan G Z, Liu K W, Zhou J, et al. Dynamic softening behaviors of 7075 aluminum alloy [J]. Transactions of Nonferrous Metals Society of China, 2009, 19(2): 537-541.

［9］Waldman J, Sulinski H, Markus H. The effect of ingot processing treatments on the grain size and properties of Al alloy 7075 [J]. Metallurgical and Materials Transactions B, 1974, 5(3): 573-584.

［10］Mcqueen H J, Ryan N D. Constitutive analysis in hot working[J]. Materials Science & Engineering A, 2002, 322(1):43-63.

［11］甘卫平,王义仁,陈铁平,等.6013铝合金热变形行为研究[J].材料导报, 2006, 20(5): 111-113.

Gan W P, Wang Y R, Chen T P, et al. Research of hot deformation behavior of 6063 aluminum alloy[J]. Materials Review, 2006, 20(5): 111-113.

［12］刘建勃,王智毅. Al-Mg-Si铝合金热变形过程动态再结晶行为研究[J].热加工工艺, 2017, 46(9): 67-70.

Liu J B, Wang Z Y. Investigation on dynamic recrystallization behavior of Al-Mg-Si aluminum alloy during hot deformation [J]. Hot Working Technology, 2017, 46(9): 67-70.

［13］徐杰, 肖铁忠, 黄娟. TC18钛合金等高温压缩过程的组织性能[J]. 锻压技术, 2017, 42(1):111-115.

Xu J, Xiao T Z, Huang J. Microstructure and properties of isothermal high-temperature compression process for titanium alloy TC18[J]. Forging & Stamping Technology. 2017, 42(1):111-115.

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