本文主要探討AZ31及AZ61鎂合金汽車軸承套蓋零組件之熱鍛成形性，首先利用中鋼高速金屬試驗機依不同成形溫度及不同應變率下，進行鎂合金圓柱壓縮實驗以求得應力-應變曲線。並將圓柱壓縮實驗所得之AZ31及AZ61鎂合金應力-應變數據，代入DEFORM之分析軟體中，進行鎂合金汽車軸承套蓋零組件在不同模具中之鍛造成形性分析。另外以鎂合金棒材進行汽車軸承套蓋零組件之熱鍛實驗，以求得鎂合金汽車軸承套蓋零組件之最佳成形條件。
最後藉由硬度試驗及金相觀察來評估鎂合金汽車軸承套蓋零組件在不同加工溫度下對於鍛造零件之強度及顯微組織之影響。

This study investigates the formability of AZ31 and AZ61 magnesium alloy for bearing cover of the car under hot forging. Firstly high speed metal test machine of China steel Co. Ltd. is used to carry out the compression tests under different forming temperature and strain rates to obtain the stress-strain curves. Then, the stress-strain data obtained from compression test under different dies are applied to analyze the formability of magnesium alloy for bearing cover of the car under forging by commercial package DEFORM. Besides, hot forgings of magnesium alloy for bearing cover of car are carried out to study the formability of magnesium alloy, and to find the best forging condition.
Finally, from the measured result of hardness and metallographic observation of forged part, the influence of forming temperatures on the strength and microstructure of magnesium alloy under forging of bearing cover of car are evaluated.

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