气泡形核和长大对Gasar多孔Cu的气孔结构和分布的影响

发布时间：2018-06-25 08:55

本文选题：金属材料 + Gasar　；参考：《材料研究学报》2017年09期

【摘要】：研究了气泡形核及长大对Gasar气孔结构和分布的影响。结果表明:气孔在柱状晶过渡区内生长时,其定向生长受限使气孔的长度变短,内壁不光滑,圆整度变小;当基体以柱状晶生长时气孔随基体共生生长形成典型藕状多孔结构,气孔的长度增加,内壁光滑,圆整度增加。随着气体压力的增大形核功降低导致气泡形核率增加,从而使藕状多孔Cu中气泡的分布逐渐从晶界转移到晶内,试样的平均孔径减小而气孔的密度数和均匀性提高。由于固液界面上的沟槽和晶界的特殊性,气泡在晶界处的形核优先于晶内,导致晶界处气孔的平均直径比晶内气孔的直径大。
[Abstract]:The effects of bubble nucleation and growth on the pore structure and distribution of Gasar were studied. The results show that the length of pores is shorter, the inner wall is not smooth and the roundness is smaller when the stomata grow in the columnar transition zone, and when the matrix grows as columnar crystals, the pores form a typical root-like porous structure when the matrix grows symbiotically with the matrix. The length of the pore is increased, the inner wall is smooth and the roundness is increased. With the increase of gas pressure, the nucleation rate of bubbles increases, which makes the distribution of bubbles gradually transfer from grain boundary to crystal, and the average pore size decreases and the density and uniformity of pores increase. Because of the particularity of the grooves and grain boundaries at the solid-liquid interface, the nucleation of bubbles at the grain boundaries takes precedence over that at the grain boundaries, resulting in the average diameter of the pores at the grain boundaries being larger than the diameter of the pores in the grains.
【作者单位】：昆明理工大学城市学院;昆明理工大学航空学院;昆明贵金属研究所稀贵金属综合利用新技术国家重点实验室;
【基金】：贵金属先进材料协同创新中心协同创新基金(2014XT03) 稀贵金属综合利用新技术国家重点实验室开放课题(SKL-SPM-201545)~~
【分类号】：TB383.4

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