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標題: 5083Al-Mg-Mn合金熱軋延板材沿厚度方向晶粒等軸均一化之研究
Uniform Equiaxed Grain Structure throughout Thickness ofHot-rolled5083 Al-Mg-Mn alloy Thick Plate after a Tempering Treatment
作者: Chen, Hsu-Feng
關鍵字: 5083鋁合金;5083;熱軋延;hot rolling
出版社: 材料工程學系所

In a conventional hot-rolled 5038 al-Alloy thick plate, the crystalline structure at the central part in the thickness direction comprises primarily slender grains. However, the grain structure is always equiaxed near the surface of the rolling plate. In this experiment, the shape of the slab before hot rolling was changed to a trapezoid. A main goal is to increase the amount of plastic strain, increasing the dislocation density in the central part of the plate hot-rolled from the trapezoidal aluminum slab. The experimental results indicated that, according to TEM observations, the center of the plate of hot-rolled trapezoidal slab had a higher dislocation density than the center of the rectangular slab. Subsequently, heat treatment caused the treated grains to become equiaxed. Therefore, an equiaxed grain structure that was uniform in the thickness direction of a hot-rolled thick plate could be obtained because the hot rolling of the trapezoidal slab caused profound lateral strain, in addition to extensive deformation in the rolling direction. The excess deformation resulted in a high dislocation density in the central region of the as-hot rolled plate, increasing the strain energy that was stored for recrystallization.
Appears in Collections:材料科學與工程學系

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