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자료유형
학술저널
저자정보
ChoongDo Lee (Inha Technical College)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.5
발행연도
2021.1
수록면
900 - 913 (14page)

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초록· 키워드

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The contribution of porosity variation affecting the tensile properties of A356 aluminium alloys was investigated in terms ofthe variations in the quality index of tensile properties as well as the strength coefficient and strain-hardening exponent associatedwith the T6-treatment. The test specimens were prepared using a low-pressure die-casting and subsequent T6-treatment,and the contribution of microporosity, microstructural features and strain-relating factors to quality index was quantitativelyevaluated using a modified constitutive model. The quality index of A356 alloys increases gradually with the lapse of ageingtime upon T6-treatment, which increases significantly at the initial ageing stage with rise in the ageing temperature. Additionally,the quality index of A356 alloy primarily depends on the porosity variation with power law relationship, irrespectiveof its state, i.e. solutionised or artificially aged. Theoretically, the strength coefficient directly determines the nominal levelof quality index. The overall dependence of quality index on porosity variation is weakened with increasing tensile strain,but it significantly depends upon the porosity variation for lower values of the strain-hardening exponent. The age hardeningarises an explicit transition on fracture path by the damage evolution of eutectic Si particles, which can influence the overalllevel of quality index through a change in the effective void area fraction, with the microporosity variation by pre-existingmicro-voids in casting alloys.

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