<strong>Al-Mg-Si</strong>合金中的富铁相对其力学性能的影响

doi:10.11901/1005.3093.2023.417

材料研究学报

2024, Vol. 38

Issue (9): 701-710 DOI: 10.11901/1005.3093.2023.417

研究论文

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Al-Mg-Si合金中的富铁相对其力学性能的影响

汪小锋¹^,²^,³(

), 谭蔚¹, 冯光明², 刘吉波⁴, 刘先斌⁴, 鲁涵⁴

1 天津大学化工学院天津 300350
2 宁波力劲科技有限公司宁波 315800
3 宁波大学冲击与安全工程教育部重点实验室宁波 315211
4 宁波展慈新材料科技有限公司宁波 315338

Effect of Fe-rich Phase on Mechanical Properties of Al-Mg-Si Alloy

WANG Xiaofeng¹^,²^,³(

), TAN Wei¹, FENG Guangming², LIU Jibo⁴, LIU Xianbin⁴, LU Han⁴

1 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
2 Ningbo LK Technology Co. Ltd., Ningbo 315800, China
3 Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, China
4 Ningbo Zhanci New Material Co. Ltd., Ningbo 315338, China

引用本文:

汪小锋, 谭蔚, 冯光明, 刘吉波, 刘先斌, 鲁涵. Al-Mg-Si合金中的富铁相对其力学性能的影响[J]. 材料研究学报, 2024, 38(9): 701-710.
Xiaofeng WANG, Wei TAN, Guangming FENG, Jibo LIU, Xianbin LIU, Han LU. Effect of Fe-rich Phase on Mechanical Properties of Al-Mg-Si Alloy[J]. Chinese Journal of Materials Research, 2024, 38(9): 701-710.

全文: PDF(22646 KB) HTML

摘要:

制备了两种低富铁相含量不同的Al-Mg-Si合金并表征其显微组织、织构和进行拉伸实验，研究了富铁相对其组织、织构和力学性能的影响。结果表明：加工使合金中富铁相的形态和尺寸发生变化，尤其是中间退火使部分粗大的富铁相转变为纳米尺度；虽然富铁相对加工过程中中间状态的组织影响较小，但是最终大幅细化成再结晶晶粒组织；富铁相通过再结晶机制影响再结晶织构组分和体积分数；富铁相有利于大幅提高这种合金的屈服强度、抗拉强度及塑性应变比r值，降低应变硬化指数n值及各向异性系数Δr值且保证其延伸率不变。力学性能的提高，可归因于合金的细晶组织和弱织构。这表明，在Al-Mg-Si合金中引入适量的富铁相有利于提高其力学性能。

关键词 ：金属材料, 富铁相, Al-Mg-Si合金, 组织, 织构

Abstract：

Two Al-Mg-Si alloys with different Fe-rich phase contents within a range of low Fe-rich phase content were designed, and the effect of Fe-rich phase on microstructure, texture and mechanical properties of the alloys were studied through microstructure characterization, texture measurement and tensile test. The results show that the shape and size of the Fe-rich phase may undergo continuous changes during thermomechanical processing, especially for the intermediate annealing state, and some coarse particles of Fe-rich phase could become nano-sized; although the introduction of the Fe-rich phase affects the microstructure of the intermediate states slightly during thermomechanical processing, it may be beneficial to efficiently refine the final recrystallization grain structure; Fe-rich phase can affect recrystallization texture and volume fractions, and thus the final weak recrystallization texture may be developed; Fe-rich phase is beneficial to improve yield strength, ultimate tensile strength and plastic strain ratio r, reduce strain hardening exponent n and planar anisotropy coefficient, and keep elongation unchanged. The improvement of properties can be attributed to the fine microstructure and weak texture.

Key words： metallic materials Fe-rich phase Al-Mg-Si alloy microstructure texture

收稿日期: 2023-08-25

ZTFLH:

TG146.2

基金资助:国家自然科学基金(52005271);宁波市科技创新2025 重大专项项目(2021Z099, 2023Z005)

通讯作者: 汪小锋，wangxiaofeng@nbu.edu.cn，研究方向为高性能铝合金设计开发

Corresponding author: WANG Xiaofeng, Tel: 17858883615, E-mail: wangxiaofeng@nbu.edu.cn

作者简介: 汪小锋，男，1985年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2023.417 或 https://www.cjmr.org/CN/Y2024/V38/I9/701

表1 Al-Mg-Si合金的化学成分

图1 拉伸试样的尺寸示意图

图2 Al-Mg-Si合金的铸态组织

图3 Al-Mg-Si合金均匀化态的组织

图4 Al-Mg-Si合金板材的热轧组织

图5 中间退火态Al-Mg-Si合金板材的组织

图6 中间退火态Al-Mg-Si合金板材中第二相粒子的分布

图7 冷轧态Al-Mg-Si合金板材的组织

图8 T4P态Al-Mg-Si合金板材的EBSD分析

图9 T4P态Al-Mg-Si合金板材的织构

表2 合金板材A和B的再结晶织构组分的体积分数

Alloy	Direction / (°)	r	Average r ( $r ¯$ )	Δr	n	Average n	Elongation / %	Yield strength / MPa	Ultimate tensile strength / MPa
A	0	0.725	0.59	0.194	0.312	0.315	26.3	113	237
	45	0.493			0.312		25.3	105	224
	90	0.649			0.323		24.9	105	223
B	0	0.700	0.63	0.102	0.298	0.299	25.7	133	269
	45	0.579			0.298		27.0	124	255
	90	0.661			0.302		26.0	125	253

表3 T4P态合金板材的力学性能

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