鋁鈧合金之撞擊變形與差排結構特徵分析

Impact Deformation and Dislocation Substrate of Al-Sc Alloy

李偉賢(Woei-Shyan Lee) ； 陳銘祥(Ming-Shiang Chen) ； 楊孟杰(Meng-Chieh Yang)

《先進工程學刊》 3卷1期 (2008/01) Pp. 57-64

https://doi.org/10.29948/JAE.200801.0008

摘要

本文研究鋁鈧合金在高應變速率荷載情況下之撞擊變形行為，我們使用壓縮式霍普金森桿在不同應變速率及溫度下進行機械測試。實驗結果顯示，鋁鈧合金之塑流應力值、加工硬化率、應變速率敏感性係數及熱活化體積皆會隨著應變數、應變速率和溫度範圍之變異而改變。另外，我們論證Zerilli-Armstrong構成方程式，其可針對鋁鈧合金之撞擊變形行為提供精確之預測。

關鍵字

霍普金森桿 ； 鋁鈧合金 ； 應變速率

並列摘要

This paper employs a compressive split-Hopkinson bar to investigate the impact deformation behavior of Al-Sc alloy at different strain rate and different temperatures. The results indicate that the flow stress, work hardening rate, strain rate sensitivity and activation volume of Al-Sc alloy are all dependent on the strain, strain rate and testing temperature. It is found that the impact deformation behaviour of Al-Sc alloy can be accurately described using the Zerilli-Armstrong constitutive equation.

並列關鍵字

split-Hopkinson bar ； Al-Sc alloy ； strain rate