Effect of Zr Addition on Microstructure and Mechanical Properties of Al-10Zn-2.5Mg-1.6Cu Alloy Sheet

doi:10.12068/j.issn.1005-3026.2022.07.006

Abstract

Abstract: The mechanical properties and microstructure， such as the phase configuration and the grain characteristics of the T6 temper Al-10Zn-2.5Mg-1.6Cu alloy sheet were investigated with the Zr addition of 0， 0.046%， 0.098%， 0.151% and 0.185%， respectively. The results show that there is no obvious change of the micro-sized T and Al₇Cu₂Fe phases in the samples， the Zr-containing constituent phases cannot be formed and the number of Al₃Zr dispersoid nanoparticles increases with the Zr addition. Adding 0.046% Zr can refine the equiaxed Cube-oriented grains of the sample. When the Zr content exceeds 0.098%， the recrystallization nucleation can be inhibited， most of the grain shape are fibrous and the grain texture is mainly Brass， S， R and Copper orientations and its fraction increases with the Zr content. When the Zr content increases， the yield and tensile strength of the samples increase gradually and the final elongation firstly increases and then slightly decreases. The T6 temper Al-10Zn-2.5Mg-1.6Cu alloy sheet with the 0.151% Zr has the optimal performance， associated with the tensile and yield strength and final elongation of 706， 645MPa and 10.3%， respectively.

Key words: Al-10Zn-2.5Mg-1.6Cu alloy sheet; Zr content; alloy phase; recrystallization; texture; mechanical property

CLC Number:

TP146.21

TIAN Ni ， ZHANG Yao-zhong， ZHOU Yi-ran， QIN Guang-hua. Effect of Zr Addition on Microstructure and Mechanical Properties of Al-10Zn-2.5Mg-1.6Cu Alloy Sheet[J]. Journal of Northeastern University(Natural Science), 2022, 43(7): 951-958.

References

[1]Georgantzia E，Gkantou M，Kamaris G S.Aluminium alloys as structural material:a review of research ［J］.Engineering Structures，2021，227:111372.
[2]张新明，刘胜胆.航空铝合金及其材料加工［J］.中国材料进展，2013，32(1):39-55.(Zhang Xin-ming，Liu Sheng-dan.Aerocraft aluminum alloys and their materials processing ［J］.Materials China，2013，32(1):39-55.)
[3]Fang H C，Chao H，Chen K H.Effect of Zr，Er and Cr additions on microstructures and properties of Al-Zn-Mg-Cu alloys ［J］.Materials Science and Engineering:A，2014，610:10-16.
[4]Yang Y，Tan P，Sui Y D，et al.Influence of Zr content on microstructure and mechanical properties of as-cast Al-Zn-Mg-Cu alloy ［J］.Journal of Alloys and Compounds，2021，867:158920.
[5]Chiu Y C，Du K T，Bor H Y，et al.The effects of Cu，Zn and Zr on the solution temperature and quenching sensitivity of Al-Zn-Mg-Cu alloys ［J］.Materials Chemistry and Physics，2020，247:122853.
[6]Fang H C，Yang H L，Zhu J M，et al.Effect of minor Cr，Mn，Zr or Ti on recrystallization，secondary phases and fracture behaviour of Al-Zn-Mg-Cu-Yb alloys ［J］.Rare Metal Materials and Engineering，2020，49(3):797-810.
[7]Zhang W，Xing Y，Jia Z H，et al.Effect of minor Sc and Zr addition on microstructure and properties of ultra-high strength aluminum alloy ［J］.Transaction of Nonferrous Metals Society of China，2014，24(12):3866-3871.
[8]Xiao Q F，Huang J W，Jiang Y G，et al.Effects of minor Sc and Zr additions on mechanical properties and microstructure evolution of Al-Zn-Mg-Cu alloys ［J］.Transactions of Nonferrous Metals Society of China，2020，30(6):1429-1438.
[9]谢优华，杨守杰，戴圣龙，等.含锆铝合金的力学性能和强化机理［J］.中国有色金属学报，2003，13(5):1192-1195.(Xie You-hua，Yang Shou-jie，Dai Sheng-long，et al.Mechanical properties and strengthening mechanism of aluminum alloys containing zirconium ［J］.The Chinese Journal of Nonferrous Metals，2003，13(5):1192-1195.)
[10]Ebrahimi S，Emamy R，Pourkia R，et al.The microstructure，hardness and tensile properties of a new super high strength aluminum alloy with Zr addition ［J］.Materials and Design，2010，31(9):4450-4456.
[11]Li Y X，Li P，Zhao G，et al.The constituents in Al-10Zn-2.5Mg-2.5Cu aluminum alloy ［J］.Materials Science and Engineering:A，2005，397:204-208.
[12]Peng Y H，Liu C Y，Wei L L，et al.Quench sensitivity and microstructures of high-Zn-content Al-Zn-Mg-Cu alloys with different Cu contents and Sc addition ［J］.Transactions of Nonferrous Metals Society of China，2021，31(1):24-35.
[13]Li H Y，Jia L N，Huang J H，et al.Precipitation behavior and properties of extruded 7136 aluminum alloy under different aging treatments ［J］.Chinese Journal of Aeronautics，2021，34(2):612-619.
[14]Tang J G，Chen H，Zhang X M，et al.Influence of quench-induced precipitation on aging behavior of Al-Zn-Mg-Cu alloy ［J］.Transactions of Nonferrous Metals Society of China，2012，22(6):1255-1263.
[15]Li W B，Pan Q L，Xiao Y P，et al.Microstructure and mechanical properties of Al-Zn-Cu-Mg-Sc-Zr alloy after retrogression and re-aging treatments ［J］.Journal of Central South University of Technology，2011，18(2):279-284.
[16]Senkov O N，Shagiev M R，Senkova S V，et al.Precipitation of Al₃(Sc，Zr) particles in an Al-Zn-Mg-Cu-Sc-Zr alloy during conventional solution heat treatment and its effect on tensile properties ［J］.Acta Materialia，2008，56(15):3723-3738.
[17]Liu D S，Zhang X M，Chen M A，et al.Effect of Zr content on quench sensitivity of AlZnMgCu alloys ［J］.Transactions of Nonferrous Metals Society of China，2007，17(4):787-792.
[18]Senkov O N，Bhat R B，Senkova S V，et al.Microstructure and properties of cast ingots of Al-Zn-Mg-Cu alloys modified with Sc and Zr ［J］.Metallurgical and Materials Transactions A，2005，36(8):2115-2126.
[19]Engler O，Hirsch J.Texture control by thermomechanical processing of AA6xxx Al-Mg-Si sheet alloys for automotive applications-a review ［J］.Materials Science and Engineering:A，2002，336(1/2):249-262.
[20]薛杰，王有为，张志豪，等.挤压温度对Al-Zn-Mg-Cu合金动态再结晶、时效组织和力学性能的影响［J］.中国有色金属学报，2017，27(11):2204-2211.(Xue Jie，Wang You-wei，Zhang Zhi-hao，et al.Effect of extrusion temperature on dynamic recrystallization，aging microstructure and mechanical properties of Al-Zn-Mg-Cu alloy ［J］.The Chinese Journal of Nonferrous Metals，2017，27(11):2204-2211.)