摘要
采用改良静滴法测定了熔融Ni-(Cr,Co,W)二元合金在Ar+3%H2气氛下1 773—1 873 K温度范围内的表面张力数据,采用Butler方程计算并分析了Cr、Co、W等组元在合金中的偏聚现象。结果表明,表面张力的计算值和实测值具有良好的一致性,合金的表面张力随着温度的升高而下降。自由电子数目较少,表面张力较小的组元在表面偏聚,溶质元素的原子半径与溶剂元素相比相差越大,合金熔体的偏聚现象越严重,最终导致Ni在表面富集,而Co、W在合金内部偏聚。
Surface tension of mohen Ni-（Cr, Co, W） alloys was measured at the temperature of 1 773-1 873 K in an Ar＋ 3 % H2 atmosphere using an improved sessile drop method. The segregation of Cr, Co and W in alloy was calculated and analyzed using Butler＇s equation. The result showed a good agreement between measured data and calculated data. Surface tension of molten Ni-（Cr, Co, W） alloys decreases with increasing temperature. In Ni-（Cr, Co, W） alloys, the element with smaller amount of free electrons and lower surface tension tends to segregate onto the surface of molten alloy. The bigger the difference in atom radius between Solvent and .solute was, the more significant the segregation was.As a result, Ni segregates onto the surface and Co and W segregated inside of the alloys.
出处
《武汉理工大学学报》
EI
CAS
CSCD
北大核心
2007年第12期63-67,共5页
Journal of Wuhan University of Technology
基金
教育部留学回国人员科研启动基金(2004-527)
重庆市科委自然科学基金(CSTC2005BA4016-1)
重庆市人事局留学回国人员资助基金(2005-94)
重庆工学院留学回国人员科研启动基金(2003ZD31)
关键词
镍基舍金
表面张力
偏聚
静滴法
nickel-hased alloys
surface tension
segregation
sessile drop method
