本論文主要是使用霍普金森高速撞擊試驗機及低溫裝置，於不同溫度和高應變速率荷載下測試Inconel 690合金之塑性變形行為下的機械性質及微觀結構變化。實驗溫度分別為-150℃、0℃、25℃；應變速率為2000 /s、4000 /s和6000 /s，以了解溫度及應變速率對材料塑變行為及微觀結構之影響。
實驗結果顯示，溫度和應變速率對Inconel 690合金之機械性質影響甚鉅。在相同溫度條件下，其塑流應力值、加工硬化率及應變速率敏感性係數均會隨應變速率之增加而上升，而熱活化體積則會下降。相反地，在相同應變速率條件下，其塑流應力值、加工硬化率與應變速率敏感性係數則會隨溫度之增加而下降，而熱活化體積則會上升。此外，可以藉由Zerilli-Armstrong構成方程式，來精確的預測此合金在不同溫度及應變速率下的塑變行為。
在微觀方面，由光學顯微鏡之觀測可知Inconel 690合金中有絕熱剪切帶形成及晶粒組織形貌的改變，兩者皆受溫度與應變速率的影響；而剪切帶中之裂縫生成與結合，為導致材料發生破壞的主要原因。在掃描式電子顯微鏡分析下，破壞形貌中可發現韌窩組織，表示Inconel 690合金屬於延性破壞模式，且其韌窩組織隨著溫度和應變速率的增加而變得較密且深。而在穿透式電子顯微鏡下則可觀測到差排密度隨著應變速率上升而增加，且可發現滑移帶的產生。最後結合巨觀與微觀結果證明了差排密度、塑流應力值、應變速率敏感性係數及熱活化體積有重要的相關性。

This study uses a split-Hopkinson bar and cryogenic devices to investigate the impact deformation behavior, fracture response and dislocation substructure of Inconel 690 super alloy at different temperatures of 25℃, 0℃and -150℃ under strain rates of 2000 /s, 4000 /s and 6000 /s, respectively.
The experimental results indicate that the mechanical properties are related to temperatureandstrain rate. At a constant temperature, plastic stress, work hardening, strain rate sensitivity all increase with the increasing strain rate, while the thermal activation volume decreases. However, at a constant strain rate, plastic stress, work hardening rate and strain rate sensitivity decrease with increasing temperature, while the thermal activation volume increases. In addation, the observed impact deformation behavior of this alloy under current testing conditions can be described by the Zerilli-Armstrong equation.
Optical microstructural observations reveal that the formation of adiabatic shear band and morphology of deformed grain of Inconel 690 super alloy both affected by temperature and strain rate. The SEM fracture analysis results indicate that the Inconel 690 specimens fail predominantly as the result of intensive localized shearing. The fracture surfaces of the deformed specimens are characterised by a dimple structure. The density of dimples increases with increasing strain rate and temperature.Transmission electron microscopy (TEM) observations show that the dislocation density increases with increasing strain rate, but decreases with increasing temperature.The relationship between the dislocation density and flow stress can be described by the Bailey-Hirsch type relation. Finally, the flow stress, strain rate sensitivity and thermal activation volume are related to the observeddislocation substructure.

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