材料期刊网

Critical and Impeding Pressures of Al Evaporation during ISM Processing of NiAl

Guizhong LIU , Jingjie GUO , Yanqing SU , Jingzhe GUO , Jun JIA , Hengzhi FU

材料科学技术（英）

In this paper, the critical pressure pcrit and impeding pressure pimpe of the elemental evaporation were defined and studied based on the calculation of the relationship between the evaporation loss rate Nm and the chamber pressure p during melting of NiAl alloys. When the chamber pressure is lower than pcrit or higher than pimpe, Nm tends to be the maximum or minimum value and remains almost unchanged. However, declines sharply with the increase of the chamber pressure when pcrit

关键词: ISM process , null , null , null

Theoretical Calculation of the Real Vapor Pressure of Al during ISM Processing of Ni-xAl (at. pct) (x=25～50) Alloy

Jingjie GUO , Guizhong LIU , Yanqing SU , Jun JIA

材料科学技术（英）

A new model was established to calculate the real vapor pressure of Al in the molten Ni-xAl (at. pct) (x=25～50) alloy. The effects of the holding time, chamber pressure, mole fraction of Al and melting temperature on the real vapor pressure of Al in the vacuum chamber were analyzed. Because of the impeding effect of the real vapor pressure on the evaporation loss rate, within a short time (less than 10 s), the real vapor pressure tends to a constant value. When the chamber pressure is less than the saturated vapor pressure of Al, the real vapor pressure of Al is equal to the chamber pressure. While when the chamber pressure is higher than the saturated vapor pressure, the real vapor pressure of Al approaches to the saturated vapor pressure of Al of the same condition.

关键词: Real vapor pressure , null , null , null

Critical and Impeding Pressures of Al Evaporation during ISM Processing of NiAl

材料科学技术（英）

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