本論文主要探討AZ61鎂合金棒材之熱鍛成形性，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。在鎂合金之鍛造成形性之探討方面，選擇汽車變速箱軸承套蓋之零組件為研究標的，以鎂合金棒材進行閉模鍛造之實驗，並將圓柱壓縮實驗所得不同成形溫度及應變率下之應力應變資料，代入DEFORM之分析軟體中進行該軸承套蓋零組件在不同加工條件下之鍛造成形性分析。
最後將DEFORM之模擬分析結果與軸承套蓋零組件之鍛造實驗結果進行比較，尋找出可完全鍛造出軸承套蓋零組件外形輪廓及以最低鍛造負荷可完整成形之加工方法。並藉由硬度試驗及金相觀察評估溫度對於壓縮強度及顯微組織的影響。　

This study investigated the mechanical properties and forming characteristics of AZ61 magnesium alloys bar under hot working. Firstly we utilized high speed metal test machine of China Steel Co. Ltd. to carry out the compression tests under different forming temperatures and strain rates to obtain the stress-strain curves. Then, bearing cover of gear box in car components was selected as a carrier in hot forging to probe into the formability of magnesium alloys. And, the stress-strain data obtained from compression test under different forming temperatures and strain rates are applied to analyze the formability of the bearing cover by commercial package DEFORM.
Finally, by comparing the analytical results of DEFORM simulation and the experimental results. we tried to figure out the method that can manufacture bearing cover perfectly with low forging load. we also evaluated how temperature influenced hardness and microstructure of the bearing cover .

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