Tungsten-copper alloys composite combines high melting point, high electrical erosion resistance of the W [1], and high conductivity, good plasticity of the Cu [2]. Thus, it is commonly used as electric contact materials for high voltage electric switches. In most cases, the failures of engineering materials initiate from materials surface, for this kind of W-Cu alloy prepared by powder metallurgy method is the same failure [3,4]. Surface nano-crystallization technology has been used to improve the mechanical properties of engineering materials. So far, nano has been achieved on the surface of aluminum
alloy [5], low carbon steel [6], Cu [7] by some surface machining processing methods. It is obvious that there are many studies focus on surface nano-crystallization of pure metal and alloy, but properties of W-Cu alloys different from others have rarely been reported.
This paper aims at studying the influence of surface nano-crystallization
on surface morphology and microstructure of W-Cu alloy by
surface peening technology and to explore the grain refinement
mechanism of SFPB-treated W-Cu alloys.
Tungsten-copper alloys composite combines high melting point, high electrical erosion resistance of the W [1], and high conductivity, good plasticity of the Cu [2]. Thus, it is commonly used as electric contact materials for high voltage electric switches. In most cases, the failures of engineering materials initiate from materials surface, for this kind of W-Cu alloy prepared by powder metallurgy method is the same failure [3,4]. Surface nano-crystallization technology has been used to improve the mechanical properties of engineering materials. So far, nano has been achieved on the surface of aluminumalloy [5], low carbon steel [6], Cu [7] by some surface machining processing methods. It is obvious that there are many studies focus on surface nano-crystallization of pure metal and alloy, but properties of W-Cu alloys different from others have rarely been reported.This paper aims at studying the influence of surface nano-crystallizationon surface morphology and microstructure of W-Cu alloy bysurface peening technology and to explore the grain refinementmechanism of SFPB-treated W-Cu alloys.
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