발간논문

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Vol.14, No.5, 519 ~ 528, 1976
Title
The Effect of Cooling Rate on Transformation and Structure Changes in Uranium Base Aluminum Alloys
정성훈S . H . Jung, 박원구W . K . Park, 홍종휘Jong Hwi Hong
Abstract
The effect of cooling rate on transformation temperature, microstructures and microhardness of pure uranium and U-(650, 1500 ppm) Al alloy s was investigated. It was found that the transformation temperatures of both gamma-to-beta and beta-to-alpha decreased with the increase of the aluminum contents. The degree of the lowering of the transformation temperature was increased as the aluminum contents and cooling rate were increased. Grain size was decreased with increasing the cooling rate. An feathery or accicular structures were obtained when aluminum added alloys were severely cooled from gamma range. The precipitates of UAI₂ appeared with in grains or on the grain boundaries of alloys. The size of the precipitates decreased with the increase of the cooling rate. Microhardness measurement showed that hardness increases as the alumiunm contents and coding rate were increased. The increase of the hardness is supposed to be resulted from the size of precipitation arid lattice hardening due to the martensite transformation.
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