重力及微重力条件下Pd_(40)Ni_(40)P_(20)合金凝固组织中溶质原子的分布特征  

SOLUTE DISTRIBUTION CHARACTERISTICS OF Pd 40 Ni 40 P 20 ALLOY SOLIDIFIED IN MICROGRAVITY AND GRAVITY CONDITIONS

作　　者：刘日平[1] 燕山大学材料工程学院 张湘义[1] 赵建华[1] 贺端威[1] 孙力玲[1] 秦志成[1] 许应凡[1] 王文魁[1] 

机构地区：[1]中国科学院物理研究所

出　　处：《物理学报》1997年第4期819-825,共7页Acta Physica Sinica

摘　　要：研究了Ｐｄ４０Ｎｉ４０Ｐ２０合金在重力（１ｇ）及微重力（μｇ）条件下凝固组织中溶质原子的分布．与重力条件相比，微重力条件下凝固的样品组织中，初生相的Ｐ含量较低，而Ｐｄ的含量较高；共晶区域内的平均Ｐ含量较高而平均Ｐｄ含量较低．深入分析初生树枝晶一次枝晶间距Ｌ与冷却率υ以及固液界面前沿液相中溶质综合输运系数Ｄ的相互关系，发现地面条件下的固液界面前沿液相中溶质综合输运系数Ｄ１ｇ比空间的Ｄμｇ大１７倍．This paper studies the difference of solute distribution in microstructure of Pd 40 Ni 40 P 20 alloy solidified on board a Chinese Retrievable Satellite and on the ground.Compared with those in normal gravity condition(1g),it was found that P content was lower but Pd content was higher in the primary phase,however in the eutectic region P content increased but Pd content decreased in microgravity condition(μg).By evaluating the mass transport coefficients in both cases it can be concluded that the difference in solute distribution both in 1g and μg conditions was due to the existence of buoyancy convection in the ground based experiments.

关 键 词：溶质原子分布 合金凝固 微重力 

分 类 号：TG111.4[金属学及工艺—物理冶金]