鋁鈧合金在極高速剪切荷載下之絕熱剪切變形行為研究

Adiabatic Shearing Behaviour of Al-Sc Alloys under Extreme High Shear Load

10.29948/JAE.200804.0003

李偉賢(Woei-Shyan Lee)；陳道星(Tao-Hsing Chen)；盧俊廷(Chun-Ting Lu)

絕熱剪切 ； 鋁鈧合金 ； 帽型試件 ； 高速變形 ； adiabatic shear ； hat-shaped ； Al-Sc alloy ； high shear loading ； shear band

先進工程學刊

3卷2期（2008 / 04 / 01）

113 - 122

繁體中文

本文利用霍普金森撞擊試驗機，以帽型試件(Hat Shaped)來探討三種不同鋁鈧合金在極高速動態剪切荷載下之絕熱剪切變形行為。實驗於室溫25℃，應變速率分別為3.0×10^5s^(-1)~6.3×10^5s^(-1)下進行，藉由實驗所得之巨觀機械性質與和微觀破壞機制，來探討以瞭解鋁鈧合金件在極高應變速率下的動態剪切特性及剪切帶微觀組織之變化。

This study uses a compressive split-Hopkinson pressure bar with hat-shaped specimens to investigate adiabatic shear banding in three Al-Sc alloys tested at room temperature under extremely high strain rates ranging from 3.0×10^5s^(-1) to 6.5×10^5s^(-1). Optical microscopy(OM) and scanning electronic microscopy (SEM) techniques are used to analyze the shear band formation and the microstructural characteristics of the deformed specimens in order to establish the correlation between the adiabatic shear behaviour of the three Al-Sc alloys and their respective mechanical properties.