발간논문

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Vol.35, No.6, 689 ~ 697, 1997
Title
Hot Deformation Behavior of Al-7wt%Mg Alloy
김형욱 , 강석봉 Hyoung Wook Kim , Suk Bong Kang
Abstract
The high temperature deformation behavior of Al-7wt%Mg alloy was investigated with the strain rates of 10^(-1)/sec, 10^(-2)/sec and 10^(-3)/sec and the test temperatures of 350℃, 400℃ and 450℃ by hot compression test. Flow curves were well explained by hyperbolic sine relationship, ε=A(sinh(0.012σ_p))^(2.954) exp(-139.5KJ/RT). The softening of Al-7wt%Mg alloy during hot deformation was mainly induced by dynamic recovery and dynamic recrystallization. Microstructural change of this alloy was interpreated by Zener-Hollomon parameters(Z). Microstructure induced by the recovery was composed of elongated grains above Z parameter of 10^9. Below this value, the recrystallization was occurred and its structure consisted of small equaxial grains of about 30㎛.
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