The dependency of the microhardnes on microstructure and solidification parameters of directionally solidified Al–4.5wt.%Cu in clay mold

Dedy Masnur; Viktor Malau; Suyitno Suyitno

doi:10.15282/jmes.14.3.2020.13.0558

Authors

Dedy Masnur Mechanical and Industrial Engineering Department, Universitas Gadjah Mada, Jl. Grafika No. 2, Yogyakarta 55281, Indonesia
Viktor Malau Mechanical and Industrial Engineering Department, Universitas Gadjah Mada, Jl. Grafika No. 2, Yogyakarta 55281, Indonesia
Suyitno Suyitno Mechanical and Industrial Engineering Department, Universitas Gadjah Mada, Jl. Grafika No. 2, Yogyakarta 55281, Indonesia

DOI:

https://doi.org/10.15282/jmes.14.3.2020.13.0558

Keywords:

Al-Cu, unidirectional solidification, microstructure, clay mold, micro-hardness

Abstract

Improvement of material properties is achieved by controlling parameters involved in the solidification process; therefore, understanding them and their implication are essential. This work investigated the dependency of solidification parameters (cooling rate (T_R), growth rate (V_L), local solidification time (t_SL), temperature gradient (G)), microstructure parameters (primary (λ₁) and secondary (λ₂) dendrite arm spacing), and micro-hardness values (HV) of Al-4.5wt.%Cu in the clay mold. The samples were directionally solidified in Bridgman vertical apparatus and the temperature is recorded during the cooling. The solidification parameters were obtained from the cooling curve. The microstructures and micro-hardness were characterized using an optical microscope and micro-hardness tester. The microstructure parameters were measured and plotted as functions of solidification parameters using linear regression. The relation between HV and microstructure parameters are analyzed. The results show the λ₁ and λ₂ change inversely with solidification parameters except for t_SL. Comparison to other works shows the exponent values of solidification parameters of the clay mold are lower than that of the carbon and stainless-steel mold. The exponent value of λ₂ in the clay mold is -0.183, close to the value in the graphite mold. The clay has the potential as mold material since it characteristic close to the graphite.

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