[1]张洪敏,江鹏,潘海军,等.高固溶Al-7Mg合金高温拉伸行为及本构方程研究[J].常州大学学报(自然科学版),2025,37(01):15-21.[doi:10.3969/j.issn.2095-0411.2025.01.002]
　ZHANG Hongmin,JIANG Peng,PAN Haijun,et al.Study on high-temperature tensile deformation behaviors and corresponding constitutive equation of a high solid solution Al-7Mg alloy[J].Journal of Changzhou University(Natural Science Edition),2025,37(01):15-21.[doi:10.3969/j.issn.2095-0411.2025.01.002]
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高固溶Al-7Mg合金高温拉伸行为及本构方程研究()
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常州大学学报(自然科学版)[ISSN:2095-0411/CN:32-1822/N]

卷:
第37卷
期数:
2025年01期
页码:
15-21
栏目:
材料科学与工程
出版日期:
2025-01-22

文章信息/Info

Title:
Study on high-temperature tensile deformation behaviors and corresponding constitutive equation of a high solid solution Al-7Mg alloy
文章编号:
2095-0411(2025)01-0015-07
作者:
张洪敏; 江鹏; 潘海军; 闫恪涛; 王广原; 张彬
常州大学 机械与轨道交通学院, 江苏 常州 213164
Author(s):
ZHANG Hongmin;  JIANG Peng;  PAN Haijun;  YAN Ketao;  WANG Guangyuan;  ZHANG Bin
School of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou 213164, China
关键词:
Al-Mg合金;  高温拉伸性能;  微观组织;  本构方程
Keywords:
Al-Mg alloys;  high-temperature tensile property;  microstructure;  constitutive equation
分类号:
TG 1
DOI:
10.3969/j.issn.2095-0411.2025.01.002
文献标志码:
A
摘要:
光学显微镜(OM)及透射电子显微镜(TEM)研究发现热挤压制备的高固溶Al-7Mg合金由均匀粗晶粒组成,平均尺寸约为16 μm,基体中没有检测到第二相。通过设计不同变形参数的高温拉伸实验,探索了Al-7Mg合金高温拉伸变形行为。其中,断裂延伸率随温度的升高而提高。较粗的晶粒导致该合金在400 ℃拉伸时的断裂延伸率约为200%。应变速率敏感系数(0.16～0.31)及变形激活能(124 kJ/mol)计算结果表明随拉伸温度由200 ℃提高至400 ℃,Al-7Mg合金的变形机制由位错滑移/蠕变转变为溶质拖拽蠕变,该过程由晶格扩散控制。通过峰值应变处应力值的系统分析,构建了用于预测Al-7Mg合金高温拉伸峰值应力的本构方程。
Abstract:
Optical microscopy(OM)and transmission electron microscopy(TEM)results reveal that the Al-7Mg alloy prepared by hot extrusion exhibits a uniform coarse grain structure, with an average size of 16 μm. No second phases are detected. Through designing a series of high-temperature tensile experiments with different parameters, the deformation behavior of the Al-7Mg alloy is investigated. The elongation to failure is enhanced with increasing tensile temperature. The coarse grain structure gives rise to elongations to failure of 200% when deformed at 400 ℃. The calculated results of strain rate sensitivity(0.16～0.31)and deformation activation energy(124 kJ/mol)indicate that the dominant deformation mechanism of Al-7Mg alloy transforms from dislocation slip/creep to solute drag creep with increasing tensile temperature from 200 ℃ to 400 ℃, which is controlled by lattice diffusion. An Arrhenius-type constitutive model is constructed for predicting peak stress of Al-7Mg, based on systematically analyzing stress at the peak strain.

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备注/Memo

备注/Memo:
收稿日期: 2024-06-14。
基金项目: 江苏省自然科学基金资助项目(BK20220629); 常州大学科学启动基金资助项目(ZMF22020096)。
作者简介: 张洪敏(1992—), 女, 黑龙江牡丹江人, 博士, 讲师。E-mail: zhanghongmin@cczu.edu.cn
更新日期/Last Update: 1900-01-01