锻压技术

7075-T6高强铝合金温热变形本构方程及热加工图

英文标题：Warm deformation constitutive equation and thermal processing map of 7075-T6 high strength aluminum alloy

分类号：TG146.2

出版年,卷(期):页码：2023,48(9):230-238

摘要：

为了获得7075高强铝合金的温热成形合理变形的工艺参数，采用Gleeble3500热模拟试验机测试7075T6铝合金的应力-应变曲线。研究了该合金在变形温度为150~300 ℃和应变速率为0.01~10 s-1条件下的流变行为，并基于Arrhenius本构方程建立了0.3~0.6应变下7075T6铝合金的热加工图，最后结合金相显微组织验证了热加工图的可靠性和实用性。结果表明：7075T6铝合金对变形温度、应变速率、应变量具有高度敏感性，热形变激活能Q=291.151 kJ·mol-1；修正后的Arrhenius本构方程的拟合结果良好，相关系数r值与平均绝对误差AARE分别为99.65%和5.54%，能较好地预测7075T6铝合金的流变行为；在应变为0.6时，最佳的温热加工安全区域范围为温度为250~300 ℃、应变速率为0.01~0.05 s-1。

In order to obtain the reasonable deformation process parameters of warm forming for 7075 high strength aluminum alloy, the stress-strain curve of 7075-T6 aluminum alloy was tested by thermal simulation testing machine Gleeble-3500, and the rheological behavior of 7075-T6 aluminum alloy under the conditions of the deformation temperature of 150-300 ℃ and the strain rate of 0.01-10 s-1 was studied. Then, the thermal processing map of 7075-T6 aluminum alloy under the strain of 0.3-0.6 was established based on Arrhenius constitutive equation, and the reliability and practicability of the thermal processing map were verified by metallographic microstructure. The results show that 7075-T6 aluminum alloy is highly sensitive to deformation temperature, strain rate and strain amount, and the thermal deformation activation energy Q is 291.151 kJ·mol-1. The fitting result of the modified Arrhenius constitutive equation is good, and the correlation coefficient r value and the average absolute error AARE are 99.65% and 5.54% respectively, which can better predict the rheological behavior of 7075-T6 aluminum alloy. When the strain is 0.6, the best warm processing safe zone range is the temperature of 250-300 ℃ and the strain rate of 0.01-0.05 s-1.

基金项目：

国家自然科学基金资助项目（51874226）；西安市科技局科技创新引导项目（201805033YD11CG17（10））

作者简介：彭宇（1995-），男，硕士研究生 E-mail：1062015258@qq.com 通信作者：杨程（1976-），男，博士，副教授 E-mail：yang.cheng@stu.xjtu.edu.cn

参考文献：

[1]罗锐,曹赟,邱宇,等.喷射沉积态AlZnMgCu合金的高温变形行为及组织演变[J].稀有金属,2022,46(2):144-152.

Luo R, Cao Y, Qiu Y, el al.Deformation characteristics and microstructure evolution of spraydeposited AlZnMgCu alloy [J]. Chinese Journal of Rare Metals, 2022,46(2):144-152.

[2]Gupta R K, Kumar V, Anil Krishnan A, el al. Hot deformation behavior of aluminum alloys AA7010 and AA7075 [J]. Journal of Materials Engineering and Performance, 2019, 28(8)：1059-9495.

[3]Shi C, Lai J, Chen X G. el al. Microstructural evolution and dynamic softening mechanisms of AlZnMgCu alloy during hot compressive deformation [J]. Materials, 2013, 7(1): 244-264.

[4]陈水生，冯莽，杨志波，等. 7075T6铝合金的高温成形性能和微观组织[J]. 金属热处理, 2021, 46(6): 191-194.

Chen S S, Feng M, Yang Z B, et al. High temperature formability and microstructure of 7075T6 aluminum alloy [J]. Heat Treatment of Metals, 2021, 46(6): 191-194.

[5]丁慧莹, 管延锦, 李玉琦, 等. GGG70L球墨铸铁的高温变形行为及其本构模型建立[J]. 锻压技术, 2022, 47(12): 249-255.

Ding H Y, Guan Y J, Li Y Q, el al. Deformation behavior at high temperature and establishment of constitutive model of GGG70L ductile iron [J]. Forging & Stamping Technology, 2022, 47(12): 249-255.

[6]刘克威, 谭安平. 7075铝合金热变形的组织演化及本构方程研究[J]. 塑性工程学报, 2020, 27(8): 159-165.

Liu K W, Tan A P. Microstructure evolution and constitutive equation in hot deformation of 7075 aluminum alloy [J]. Journal of Plasticity Engineering, 2020, 27(8): 159-165.

[7]Zhang D N, Qian Q, Shuang G, et al. A modified JohnsonCook model of dynamic tensile behaviors for 7075T6 aluminum alloy [J]. Journal of Alloys & Compounds, 2015, 619: 186-194.

[8]王雷. 铸轧7075铝合金的变形行为及其组织演变的研究 [D]. 济南: 山东大学, 2016.

Wang L. Study on the Hot Deformation Behavior and Microstructural Evolution of 7075 Aluminum Alloy [D]. Jinan: Shandong University, 2016.

[9]杨栋, 陈文琳, 王少阳, 等. 7075铝合金热变形时动态再结晶晶粒度演化模型[J]. 中国有色金属学报, 2013, 23(10): 2747-2753.

Yang D, Chen W L, Wang S Y, et al. Dynamic recrystallization grain size evolution model of 7075 aluminum alloy during hot deformation [J]. The Chinese Journal of Nonferrous Metals Society, 2013, 23(10): 2747-2753.

[10]Jeong H T, Kim H K, Kim W J. Processing maps (with flow instability criterion based on powerlaw breakdown) integrated into finite element simulations for evaluating the hot workability of 7075 aluminum alloy [J]. Materials Today Communications, 2021, 27: 102254.

[11]Wu H，Wen S P，Huang H，et al. Hot deformation behavior and processing map of a new type AlZnMgErZr alloy[J]. Journal of Alloys & Compounds, 2016, 685: 869-880.

[12]Park S Y, Kim W J. Difference in the hot compressive behavior and processing maps between the ascast and homogenized AlZnMgCu (7075) alloys [J]. Journal of Materials Science & Technology, 2016, 32(7): 660-670.

[13]Yang Y, Zhang Z, Li X, et al. The effects of grain size on the hot deformation and processing map for 7075 aluminum alloy [J]. Materials & Design, 2013, 51: 592-597.

[14]周芃, 朱荣宇, 石婵，等. 基于GTN模型的5A06铝合金温成形损伤建模[J]. 塑性工程学报, 2020, 27(12): 164-169.

Zhou P, Zhu R Y, Shi C, et al. Modeling of warm forming damage of 5A06 aluminum alloy based on GTN model [J]. Journal of Plasticity Engineering, 2020, 27(12): 164-169.

[15]陶志伟, 王雷刚, 杨兴旺，等. 喷射成形7055铝合金回收粉挤压态的热变形行为[J]. 塑性工程学报, 2022, 29(6):87-93.

Tao Z W, Wang L G, Yang X W, et al. Hot deformation behavior of sprayed 7055 aluminum alloy recycled powders as extruded [J]. Journal of Plasticity Engineering, 2022, 29(6): 87-93.

[16]Yin Z, Pan Q, Li B, et al. Characterization of hot deformation behavior of ashomogenized AlCuLiScZr alloy using processing maps [J]. Materials Science & Engineering, 2014, 614：199-206.

[17]沈智, 石一磬, 周英丽,等. 6014铝合金热冲压流变行为的本构模型修正[J]. 锻压技术,2021,46(12):67-73.

Shen Z, Shi Y Q, Zhou Y L, el al. Modification on constitutive model for rheological behavior of 6014 aluminum alloy in hot stamping[J]. Forging & Stamping Technology, 2021, 46(12): 67-73.

[18]仇鹏, 王家毅, 段晓鸽,等. AA7021铝合金热变形行为及微观组织演变机理的研究[J].材料导报,2020,34(8):8106-8112.

Qiu P, Wang J Y, Duan X G, el al. Study on hot deformation behavior and microstructure evolution mechanism of AA7021 aluminum alloy[J].Materials Reports,2020,34(8):8106-8112.

[19]Zener C, Hollomon J H. Effect of strain rate upon plastic flow of steel [J]. Journal of Applied Physics, 1944, 15(1): 22-32.

[20]Wei T, Wang Y, Tang Z, et al. The constitutive modeling and processing map of homogenized AlMgSiCuZn alloy[J]. 2021,27：102471.

[21]Mc A, Mra B, Shs B, et al. Study on hot deformation behavior of AISI 414 martensitic stainless steel using 3D processing map [J]. Journal of Manufacturing Processes, 2020, 56: 916-927.

[22]Zhou X, Wang K, Lu S, et al. Flow behavior and 3D processing map for hot deformation of Ti2.7Cu alloy [J]. Journal of Materials Research and Technology, 2020, 9(3)：2652-2661.

[23]周琳,刘运玺,陈玮,等.Ti4Al5Mo6Cr5V1Nb合金的热变形行为及热加工图[J].稀有金属,2022,46(1):27-35.

Zhou L, Liu Y X, Chen W, el al. Thermal deformation behavior and processing map of Ti4Al5Mo6Cr5V1Nb alloy [J]. Chinese Journal of Rare Metals, 2022, 46(1):27-35.

[24]Senthilkumar V, Balaji A, Narayanasamy R. Analysis of hot deformation behavior of Al 5083TiC nanocomposite using constitutive and dynamic material models [J]. Materials & Design, 2012, 37: 102-110.

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