| Summary: | 碩士 === 國立交通大學 === 工學院碩士在職專班精密與自動化工程學程 === 94 === ABSTRACT
This study was aimed at the investigation of the effect of postweld heat treatment on the mechanical properties and microstructures of Gas Tungsten Arc Welding (GTAW or TIG) weldments of newly developed high-entropy alloys. The alloys used were three casting alloys of FeCoNiCrCuAlxC0.1, where x = 0, 0.5, 1.0.
A series experiments included TIG welding, microhardness measurements, metallography, SEM and EDS analysis were conducted in this investigation.
The experimental results show that the aluminum addition can effectively increase the hardness at room temperature. At higher temperatures, the effect of precipitation strengthening can be appeared .
The heat treatments of 800℃–1000℃ for 0.5–8 hours can give better annealing and homogenous results. Therefore, these new alloys are good candidates for high temperature application.
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