Al-Mg-Si合金中的富铁相对其力学性能的影响  

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

作　　者：汪小锋 谭蔚[1] 冯光明 刘吉波 刘先斌 鲁涵 WANG Xiaofeng;TAN Wei;FENG Guangming;LIU Jibo;LIU Xianbin;LU Han(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China;Ningbo LK Technology Co.Ltd.,Ningbo 315800,China;Key Laboratory of Impact and Safety Engineering,Ministry of Education,Ningbo University,Ningbo 315211,China;Ningbo Zhanci New Material Co.Ltd.,Ningbo 315338,China)

机构地区：[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

出　　处：《材料研究学报》2024年第9期701-710,共10页Chinese Journal of Materials Research

基　　金：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)。

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。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.

关 键 词：金属材料 富铁相 AL-MG-SI合金 组织 织构 

分 类 号：TG146.2[一般工业技术—材料科学与工程]