Effect of Zr Content on Microstructure and Performance of Al-0.36Mg-1.23Si Alloy Sheet for Automobile Body

doi:10.12068/j.issn.1005-3026.2023.01.006

Abstract

Abstract: The effect of Zr content (≤ 0.29%) on the microstructure， formability and baking hardenability of Al-0.36Mg-1.23Si aluminum alloy sheet after T4P tempering was investigated through the optical microscope (OM) and transmission electron microscope (TEM)， tensile and cupping tests. The results show that when the mass fraction of Zr was less than 0.15%， the element in the alloy mainly existed in the form of 40~50nm (AlSi)₃(Zr_○xTi_1-○x○) dispersoid second-phase particles， and the amount of the particles increased with the Zr addition. The 3~23 μm (AlSi)₃(Zr_○xTi_▲1-x) primary particles were observed when the Zr content was over 0.22%. The recrystallization grains were refined from 55 μm to 20 μm with the Zr fraction increasing from 0% to 0.15%， and there was no significant change of the grain size after a further increase of Zr. With the Zr increase， the strength of the alloy increased， the elongation firstly remained unchanged and then decreased， and the n_10~20， r₁₀ and I_E values remained unchanged. The increments of yield strength after the Zr addition were in excess of 86 MPa after the simulated paint baking treatment and the increase of Zr content had no significant effects on their baking hardenability.

Key words: Al-0.36Mg-1.23Si alloy sheet; Zr content; alloy phase; grain; formability; baking hardenability

CLC Number:

TG146.21

TIAN Ni ， LI Yan-jie ， WANG Wen-ze ， FENG Zhen. Effect of Zr Content on Microstructure and Performance of Al-0.36Mg-1.23Si Alloy Sheet for Automobile Body[J]. Journal of Northeastern University(Natural Science), 2023, 44(1): 40-48.

References

[1]Weng Y Y，Jia Z H，Ding L P，et al.Clustering behavior during natural aging and artificial aging in Al-Mg-Si alloys with different Ag and Cu addition［J］.Materials Science and Engineering A，2018，732: 273-283.
[2]Wang X F，Guo M X，Peng W F，et al.Relationship among solution heating rate，mechanical properties，microstructure and texture of AlMgSiCu alloy［J］.Transactions of Nonferrous Metals Society of China，2021，31(1):36-52.
[3]Golovashchenko S F，Wang N，Le Q.Trimming and sheared edge stretchability of automotive 6xxx aluminum alloys［J］.Journal of Materials Processing Technology，2019，264: 64-75.
[4]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.
[5]Yang Y，Tan P，Sui Y，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.
[6]王松辉，孙有平，陶德福，等.Zr含量对大应变轧制2524铝合金板材微观组织及力学性能的影响［J］.材料热处理学报，2018，39(11):28-37.(Wang Song-hui，Sun You-ping，Tao De-fu，et al.Effect of Zr content on microstructure and mechanical properties of 2524 aluminum alloys sheet fabricated by large strain rolling［J］.Transactions of Materials and Heat Treatment，2018，39(11):28-37.)
[7]Wang K，Yin D，Zhao Y C，et al.Microstructural evolution upon heat treatments and its effect on corrosion in Al-Zn-Mg alloys containing Sc and Zr［J］.Journal of Materials Research and Technology，2020，9(3):5077-5089.
[8]张福豹，许晓静，吴桂潮，等.锆微合金化6013型铝合金的抗晶间腐蚀性能［J］.航空材料学报，2011，31(1):52-55.(Zhang Fu-bao，Xu Xiao-jing，Wu Gui-chao，et al.Intergranular resistance of zirconium microalloyed 6013 type aluminum alloy［J］.Journal of Aeronautical Materials，2011，31(1):52-55.)
[9]仲丽，苏娜，王雷，等.Zr含量对6061铝合金铸态组织及力学性能的影响［J］.兵器材料科学与工程，2020，43(3):91-94.(Zhong Li，Su Na，Wang Lei，et al.Effects of Zr content on microstructure and mechanical properties of as-cast 6061 aluminum alloy［J］.Ordnance Material Science and Engineering，2020，43(3):91-94.)
[10]Wong K M C，Daud A R，Jalar A.Microhardness and tensile properties of a 6xxx alloy through minor additions of Zr［J］.Journal of Materials Engineering and Performance，2009，18(1):62-65.
[11]杜鹏，闫晓东，李彦利，等.6061铝合金中富铁相在均匀化过程中的相变机理［J］.中国有色金属学报，2011，21(5):981-987.(Du Peng，Yan Xiao-dong，Li Yan-li，et al.Transformation mechanism of iron-rich phase in 6061 aluminum alloy during homogenization［J］.The Chinese Journal of Nonferrous Metals，2011，21(5):981-987.)
[12]谢优华，杨守杰，戴圣龙，等.锆元素在铝合金中的应用［J］.航空材料学报，2002，22(4):56-61.(Xie You-hua，Yang Shou-jie，Dai Sheng-long，et al.Application of element Zr in aluminum alloys［J］.Journal of Aeronautical Materials，2002，22(4):56-61.)
[13]Bunn A M，Schumacher P，Kearns M A，et al.Grain refinement by Al-Ti-B alloys in aluminum melts: a study of the mechanisms of poisoning by zirconium［J］.Metal Science Journal，1999，15(10):1115-1123.
[14]Liu G，Blake P，Ji S.Effect of Zr on the high cycle fatigue and mechanical properties of Al-Si-Cu-Mg alloys at elevated temperatures［J］.Journal of Alloys and Compounds，2019，809: 1-14.
[15]Shaha S K，Czerwinski F，Kasprzak W，et al.Aging characteristics and high-temperature tensile properties of Al-Si-Cu-Mg alloys with micro-additions of Cr，Ti，V and Zr［J］.Materials Science and Engineering A，2016，652:353-364.
[16]刘宏，赵刚，刘春明，等.几种6000系汽车板铝合金的结晶相［J］.东北大学学报(自然科学版)，2005，26(11):1070-1073.(Liu Hong，Zhao Gang，Liu Chun-ming，et al.Phase constituents of some kinds of 6000-series aluminum alloys for automotive body sheets［J］.Journal of Northeastern University(Natural Science)，2005，26(11):1070-1073.)
[17]Himuro Y，Koyama K，Bekki Y.Precipitation behavior of zirconium compounds in Zr-bearing Al-Mg-Si alloy［J］.Materials Science Forum，2006，38: 501-506.
[18]Zhu L，Guo M X，Zhang J S.The multi-scale Si-containing phases-assisted improvement in the microstructure and mechanical properties of Al-Mg-xSi-Cu-Zn alloys［J］.Materials Science and Engineering A，2021，826: 142013.
[19]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 AlZnMgCu alloys［J］.Transactions of Nonferrous Metals Society of China，2020，30(6):1429-1438.
[20]Pan T A，Tzeng Y C，Bor H Y，et al.Effects of the coherency of Al₃Zr on the microstructures and quench sensitivity of Al-Zn-Mg-Cu alloys［J］.Materials Today Communications，2021，28: 102611.
[21]Gong W Y，Xie M J，Zhang J S.Giant bake hardening response of multi-scale precipitation strengthened Al-Mg-Si-Cu-Zn alloy via pre-aging treatments［J］.Materials Characterization，2021，181: 111464.
[22]Jia Z H，Ding L P，Weng Y Y，et al.Effects of high temperature pre-straining on natural aging and bake hardening response of Al-Mg-Si alloys［J］.Transactions of Nonferrous Metals Society of China，2016，26(4):924-929.