研究目的
Investigating the surface nanocrystallization of Cu-Cr alloy using a continuous laser beam with high power density to refine the grain size of Cr-rich particles and extend the solid solubility limit of Cr in Cu.
研究成果
Stable and reliable large area surface nanocrystallization of Cu-Cr30 (wt%) was achieved by a continuous laser beam with high power density. The microstructure was characterized by nano-sized Cr-rich spheroids dispersed in the Cu-rich matrix, attributed to fast heating and rapid cooling.
研究不足
The study focuses on the surface nanocrystallization of Cu-Cr alloy using a specific laser setup. The applicability to other materials or under different conditions is not explored.
1：Experimental Design and Method Selection
A continuous Nd:YAG laser with a wavelength of 1.064 lm was used for laser surface melting (LSM) with high power density (1.08 (cid:3) 107 W/cm2). The process was conducted in a high purity argon atmosphere to avoid oxidation.
2：Sample Selection and Data Sources
Cu-30Cr (wt%) alloy prepared by powder metallurgy method was used as experimental material.
3：List of Experimental Equipment and Materials
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4：Experimental Procedures and Operational Workflow
The sample was cut perpendicular to the scanning direction after LSM. Microstructure was observed by SEM and TEM. Phase constituents were analyzed by XRD.
5：Data Analysis Methods
Crystallite size was determined by Scherrer formula. Lattice parameter variation and amount of Cr dissolved in Cu were calculated using specific equations.
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