初始晶粒尺寸和预先回复对激光加热下Cu再结晶织构的影响

THE EFFECT OF INITIAL GRAIN SIZE AND RECOVERY ON RECRYSTALLIZATION TEXTURES OF Cu HEATED BY LASER BEAM

分别对不同初始晶粒尺寸的冷轧及冷轧后经回复的纯 Ｃｕ进行了激光超快速加热再结晶处理发现细晶冷轧样品完全再结晶时其织构由立方与冷轧织构组分构成，而粗品样品为单一的立方织构；经低温回复的样品再结晶后的立方织构强度明显高于未经回复的样品．冷轧样品经短时（１１．２５ ｍｓ）激光加热，金相组织仍呈冷轧状态，而冷轧织构强度显著降低，未发现立方织构增强、分析认为，在激光加热条件下，再结晶初期各取向晶粒形核机会都增加，限制了立方晶粒形核的优势。

The cold-rolled and cold-rolled-recovered commercial pure copper specimens with different initial grain sizes were recrystallized by means of laser beam heating. It was found that the texture in the cold-rolled samples with 15 m grain size (No.1) consists of Cube and cold-rolled components, but only cube presents in the cold-rolled samples with 35 m grain size (No.2). The Cube intensity in cold-rolled-recovered samples is higher than that in cold-rolled samples after recrystallization. when the samples were heated with shorter time (11.2ms), microscopic observation revealed that the microstructures are still cold-rolled ones, but the cold-rolled textures decrease greatly, while the Cube was not found to be increased. It is possible that grains with different orientations have more chance to nucleate and grow at initial stage of recrystallization in the case of laser heating, therefore, the preference for the Cube nucleation is partly limited, but the preferential growth for the Cube grains still exists.