成分与热处理对挤压铸造AI-8Si系合金强度-硬度关系的影响研究

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中图分类号： U465.2⋅2 文献标志码：B DOI：10.19710/J.cnki.1003-8817.20250189

Study on the Influence of Composition and Heat Treatment on the Strength-Hardness Relationship of Squeeze Cast Al-8Si Alloy Series

Zhang Xin， Zhao Haidong，Wu Ning，Han Changliang （Commercial Vehicle Development Institute，FAW Jiefang AutomobileCo.，Ltd.， Changchun 130011）

Abstract：To investigate the effects of Mg and Cu element content and heat treatment processes on the relationship between tensile strength andBrinell hardness of squeeze cast Al-8Si aloys，acomprehensiveanalysis method isproposed.This method combines factorssuchasthehardening trendof thematerial’stensilestress-strain curveand the fracture locationonthecurvetoanalyzethetensile strength-Brinell hardness relationship while excluding anomalous data.Theresults indicate that，firstly，increasing thecontent of strengthening elements （e.g.，Mg andCu）inthealuminumaloyeffctivelyimprovestheyield-to-tensilestrengthratioofthealloyinas-cast，solutiontreated，aged，ndT6states，resultinginigh-yield-strengthaluminumaloys.SecondlyT6treatmentachievesthe mostsignificantimprovementintheyieldstrengthof thealuminumalloystudied，followedbyBrinellhardness，withthe leastimprovementintensilestrength.Inaddition，forthe twostudiedaluminumaloysunderdiferent T6 treatment parameters，Ally#1exhibitsayield-to-tensilestrengthratioofO.78toO.79，andAlloy#2showsaratioof0.89 to 0.91，indicatinggood consistency.However，thestrength-to-hardnessandyield-to-hardnessratiosof thetwoallys showconsiderable variability.Underdiferent T6 treatment parameters，Alloy #1's strength-to-hardnessand yield-tohardnessratios range from 2.98 to 3.29and2.37 to 2.58，respectivelywhile Ally #2'scorresponding ratios range from 2.77 to 2.88 and 2.47 to 2.57.

KeyWords：Al-Si alloy，Yield to tensile strength ratio，Brinell hardness，Squeezecasting

1前言

强度和硬度是铝铸件设计、质量检测常用的性能指标。（剩余5649字）