Zr含量对汽车车身用Al-0.36Mg-1.23Si合金板材组织及性能的影响

doi:10.12068/j.issn.1005-3026.2023.01.006

东北大学学报（自然科学版） ›› 2023, Vol. 44 ›› Issue (1): 40-48.DOI: 10.12068/j.issn.1005-3026.2023.01.006

Zr含量对汽车车身用Al-0.36Mg-1.23Si合金板材组织及性能的影响

田妮^1,2,3，李燕杰^1,2，王文泽^1,2，冯震^1,2

(1.东北大学材料科学与工程学院，辽宁沈阳110819； 2.东北大学材料各向异性与织构教育部重点实验室，辽宁沈阳110819；3.东北大学金属型线材研究中心，辽宁沈阳 110819)

发布日期:2023-01-30
通讯作者: 田妮
作者简介:田妮(1975-)，女，湖南永顺人，东北大学副教授.
基金资助:
国家自然科学基金资助项目(51871043)；中央高校基本科研业务费专项资金资助项目(N180212010)；辽宁省自然科学基金资助项目(2019-MS-113).

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

TIAN Ni^{1, 2, 3}， LI Yan-jie^{1, 2}， WANG Wen-ze^{1, 2}， FENG Zhen^{1, 2}

1. School of Materials Science & Engineering， Northeastern University， Shenyang 110819， China;2. Key Laboratory for Anisotropy and Texture of Materials， Ministry of Education， Northeastern University， Shenyang 110819， China; 3. Research Center for Metallic Wires， Northeastern University， Shenyang 110819， China.

Published:2023-01-30
Contact: TIAN Ni
About author:-
Supported by:
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摘要/Abstract

摘要： 借助OM，TEM观察，拉伸和杯突试验研究w(Zr)≤0.29%对T4P态Al-0.36Mg-1.23Si合金板材显微组织、成形性和烤漆硬化性的影响.结果表明，当w(Zr)≤0.15%时，Zr以40~50nm的(AlSi)₃(Zr_○xTi_1-○x○)弥散相粒子存在于铝基体中，粒子数量随Zr含量增加而增多，Zr质量分数超过0.22%，板材中出现3～23 μm的(AlSi)₃(Zr_○xTi_1-○x○)初生相.添加0.15% Zr使板材的再结晶晶粒从无Zr板材的55 μm细化至20 μm，Zr含量继续增加，晶粒无明显变化.Zr含量增加，T4P态板材的强度略有增大，延伸率先保持不变后逐渐减小，n_10~20，r₁₀和I_E值基本不变.含Zr合金板材经模拟烤漆后的屈服强度增量均超过86MPa，但Zr含量增加对合金板材的烤漆硬化性无明显影响.

关键词: Al-0.36Mg-1.23Si合金板材；Zr含量；合金相；晶粒；成形性；烤漆硬化性

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

中图分类号:

TG146.21

田妮，李燕杰，王文泽，冯震. Zr含量对汽车车身用Al-0.36Mg-1.23Si合金板材组织及性能的影响[J]. 东北大学学报（自然科学版）, 2023, 44(1): 40-48.

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.

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Zr含量对汽车车身用Al-0.36Mg-1.23Si合金板材组织及性能的影响

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

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