低温高应变量衬板控轧高固溶<strong>Al-Mg</strong>合金高强塑性与高热稳定性机制

doi:10.11900/0412.1961.2022.00239

金属学报

2024, Vol. 60

Issue (4): 473-484 DOI: 10.11900/0412.1961.2022.00239

研究论文

本期目录 | 过刊浏览

低温高应变量衬板控轧高固溶Al-Mg合金高强塑性与高热稳定性机制

田滕¹, 查敏¹^,²^,³(

), 殷皓亮¹, 花珍铭¹, 贾海龙¹^,³, 王慧远¹^,²^,³(

)

1 吉林大学材料科学与工程学院汽车材料教育部重点实验室长春 130025
2 吉林大学超硬材料国家重点实验室长春 130012
3 吉林大学未来科学国际合作联合实验室长春 130012

Enhanced Mechanical Properties and Thermal Stability Mechanism of a High Solid Solution Al-Mg Alloy Processed by Cryogenic High-Reduction Hard-Plate Rolling

TIAN Teng¹, ZHA Min¹^,²^,³(

), YIN Haoliang¹, HUA Zhenming¹, JIA Hailong¹^,³, WANG Huiyuan¹^,²^,³(

)

1 Key Laboratory of Automobile Materials of Ministry of Education, School of Materials Science and Engineering, Jilin University, Changchun 130025, China
2 State Key Laboratory of Super Hard Materials, Jilin University, Changchun 130012, China
3 International Center of Future Science, Jilin University, Changchun 130012, China

引用本文:

田滕, 查敏, 殷皓亮, 花珍铭, 贾海龙, 王慧远. 低温高应变量衬板控轧高固溶Al-Mg合金高强塑性与高热稳定性机制[J]. 金属学报, 2024, 60(4): 473-484.
Teng TIAN, Min ZHA, Haoliang YIN, Zhenming HUA, Hailong JIA, Huiyuan WANG. Enhanced Mechanical Properties and Thermal Stability Mechanism of a High Solid Solution Al-Mg Alloy Processed by Cryogenic High-Reduction Hard-Plate Rolling[J]. Acta Metall Sin, 2024, 60(4): 473-484.

全文: PDF(6737 KB) HTML

摘要:

通过大变形技术制备的高强Al-Mg合金具有广阔应用前景，但其塑性低和高温稳定性差的缺点严重限制其进一步发展。本工作采用低温高应变量衬板控轧(cryogenic high-reduction hard-plate rolling，CHR-HPR)制备了兼具高强塑性(抗拉强度约597 MPa、延伸率约7.7%)和高热稳定性的高固溶Mg含量Al-9Mg合金。利用EBSD、TEM、硬度测量和拉伸实验等方法系统研究了Mg含量对CHR-HPR Al-Mg合金微观组织和力学性能的影响。结果表明：CHR-HPR Al-9Mg合金中高含量固溶Mg原子与低温变形促进合金中形成了高密度位错及小角晶界，显著提高合金的屈服强度；高含量固溶Mg原子与可动位错交互作用引起的动态应变时效导致合金加工硬化能力提高，进一步提高了合金的抗拉强度和塑性。此外，在再结晶退火过程中，高含量固溶Mg原子有效地抑制位错滑移、钉扎晶界，延缓回复与再结晶的发生。因此，CHR-HPR Al-Mg合金热稳定性随固溶Mg含量增加而显著提高，其中CHR-HPR Al-9Mg合金再结晶温度达到400℃。

关键词 ： Al-Mg合金, 低温衬板控轧, 加工硬化, 力学性能, 微观组织, 再结晶

Abstract：

Al-Mg series alloys are highly desirable for structural applications, owing to their high specific strength, good formability, and excellent corrosion resistance. However, high-strength Al-Mg alloys prepared via severe plastic deformation generally exhibit poor thermal stability, which is caused by the high-density grain boundaries (GBs). Achieving simultaneous high strength and thermal stability in binary Al-Mg alloys remains a challenge. In this study, Al-9Mg alloys with a combination of high strength (~597 MPa), decent elongation (~7.7%), and enhanced thermal stability were developed via cryogenic high-reduction hard-plate rolling (CHR-HPR). The effects of solute Mg content on the microstructure evolution and mechanical properties of CHR-HPR Al-Mg alloys were systematically investigated using EBSD, TEM, microhardness measurements, and tensile tests. The high yield strength is derived from high-density dislocations and low-angle GBs promoted via the high content of solute Mg atoms and low deformation temperature. In addition to the positive roles of Mg atoms and low deformation temperature on work-hardening ability, the simultaneous improvement in the ultimate tensile strength and ductility of CHR-HPR Al-Mg alloys with increasing solute Mg content is partially attributed to the enhanced work hardening induced via the dynamic strain aging. Furthermore, the recrystallization temperature of the CHR-HPR Al-Mg alloys gradually increased with increasing solute Mg content, and the recrystallization temperature of CHR-HPR Al-9Mg could reach 400^oC. The enhanced thermal stability of CHR-HPR Al-9Mg alloy is due to the high content Mg solute atoms, which strongly retard recovery and recrystallization by dragging dislocations and pinning GBs.

Key words： Al-Mg alloy cryogenic hard-plate rolling work hardening mechanical property microstructure recrystallization

收稿日期: 2022-05-12

ZTFLH:

TG146.2

基金资助:国家自然科学基金项目(51922048);国家自然科学基金项目(51625402);国家自然科学基金项目(51790483)

通讯作者: 查敏，minzha@jlu.edu.cn，主要从事轻合金成分设计和强韧化等研究;
王慧远，wanghuiyuan@jlu.edu.cn，主要从事轻合金材料设计和制备等研究

Corresponding author: ZHA Min, professor, Tel:(0431)85094699, E-mail: minzha@jlu.edu.cn;
WANG Huiyuan, professor, Tel:(0431)85095415, E-mail: wanghuiyuan@jlu.edu.cn

作者简介: 田滕，男，1996年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2022.00239 或 https://www.ams.org.cn/CN/Y2024/V60/I4/473

表1 Al-Mg合金化学成分 (mass fraction / %)

图1 挤压态和低温高应变量衬板控轧(CHR-HPR) Al-Mg合金的XRD谱

表2 纯Al[8]、挤压态和CHR-HPR Al-Mg合金晶格参数和Mg减少量

图2 CHR-HPR Al-Mg合金微观组织的EBSD分析

图3 CHR-HPR Al-Mg合金微观组织的TEM像

图4 CHR-HPR Al-Mg合金室温拉伸性能

图5 CHR-HPR Al-Mg合金经不同温度退火30 min后的硬度变化曲线

图6 CHR-HPR Al-Mg合金经不同温度退火30 min后的室温拉伸性能

图7 CHR-HPR Al-Mg合金经275℃退火30 min后微观组织的EBSD分析

图8 CHR-HPR Al-Mg合金经300℃退火30 min后微观组织的EBSD分析

图9 CHR-HPR Al-Mg合金经350℃退火30 min后微观组织的EBSD分析

图10 CHR-HPR Al-Mg合金经400℃退火30 min后微观组织的EBSD分析

图11 CHR-HPR Al-Mg合金不同温度退火前后组织演变示意图

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