Surface tension of molten 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 ...Surface tension of molten 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 results show a good agreement between measured and calculated data.The surface tension of molten Ni-(Cr,Co,W) alloys decreases with increasing temperature.In Ni-(Cr,Co,W) alloys,the element with lower surface tension tends to segregate on the surface of molten alloy while that with higher surface tension tends to segregate inside of the molten alloy.The larger the differences in surface tension,atom radius and electron configuration between solvent and solute are,the more significant the segregation is.As a result,Ni segregates onto the surface and Co and W segregate inside the alloys.展开更多
In order to obtain more accurate density for molten Ni-(Cr,Co,W)binary alloy,the densities of molten pure Ni and Ni-Cr,Ni-Co,Ni-W alloys were measured with a sessile drop method.It is found that the measured densities...In order to obtain more accurate density for molten Ni-(Cr,Co,W)binary alloy,the densities of molten pure Ni and Ni-Cr,Ni-Co,Ni-W alloys were measured with a sessile drop method.It is found that the measured densities of molten pure Ni and Ni-Cr,Ni-Co,Ni-W alloys decrease with increasing temperature in the experimental temperature range.The density of alloys increases with increasing W and Co concentrations while it decreases with increasing Cr concentration in the alloy at 1 773-1 873 K.The molar volume of Ni-based alloys increases with increasing W concentration while it decreases with increasing Co concentration.The effect of Cr concentration on the molar volume of the alloy is little in the studied concentration range.The accommodation among atomic species was analyzed.The deviation of molar volume from ideal mixing shows an ideal mixing of Ni-(Cr,Co,W)binary alloys.展开更多
基金Supported by Scientific Research Foundation for the Returned Overseas Chinese Scholars(2004527)the Chongqing Bureau of Personal(200594)+1 种基金the Natural Science Foundation of Chongqing Municipality(CSTC2005BA4016-1)the Chongqing Institute of Technology(2003ZD31)
基金Project(2004527) supported by Scientific Research Foundation for the Returned Overseas Chinese ScholarsProject(200594) supported by the Chongqing Bureau of Personal, China+2 种基金Project(KJ070603) supported by the Municipal Education Commission of Chongqing, ChinaProject(2003ZD31) supported by Chongqing Institute of Technology, ChinaProject(CSTC2005BA4016-1) supported by Chongqing Science and Technology Commission,China
文摘Surface tension of molten 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 results show a good agreement between measured and calculated data.The surface tension of molten Ni-(Cr,Co,W) alloys decreases with increasing temperature.In Ni-(Cr,Co,W) alloys,the element with lower surface tension tends to segregate on the surface of molten alloy while that with higher surface tension tends to segregate inside of the molten alloy.The larger the differences in surface tension,atom radius and electron configuration between solvent and solute are,the more significant the segregation is.As a result,Ni segregates onto the surface and Co and W segregate inside the alloys.
基金Project(2000-2005)supported by the New Energy and Industrial Technology Development Organization in JapanProject(2004527)supported by Scientific Research Foundation for the Returned Overseas Chinese Scholar+2 种基金Project(200594)supported by Chongqing Bureau of Personnel,ChinaProject(CSTC2005BA4016-1)supported by the National Scientific Foundation of Chongqing Municipality,ChinaProject(2003ZD31)supported by Chongqing Institute of Technology,China
文摘In order to obtain more accurate density for molten Ni-(Cr,Co,W)binary alloy,the densities of molten pure Ni and Ni-Cr,Ni-Co,Ni-W alloys were measured with a sessile drop method.It is found that the measured densities of molten pure Ni and Ni-Cr,Ni-Co,Ni-W alloys decrease with increasing temperature in the experimental temperature range.The density of alloys increases with increasing W and Co concentrations while it decreases with increasing Cr concentration in the alloy at 1 773-1 873 K.The molar volume of Ni-based alloys increases with increasing W concentration while it decreases with increasing Co concentration.The effect of Cr concentration on the molar volume of the alloy is little in the studied concentration range.The accommodation among atomic species was analyzed.The deviation of molar volume from ideal mixing shows an ideal mixing of Ni-(Cr,Co,W)binary alloys.
