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Effect of Milling Tools on the Microstructure and Property of Cu-Based Composites Prepared by Mechanical Alloying 被引量:1

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摘要 Cu and Nb powders were used as starting materials to produce Cu-Nb and Cu-NbC-WC composites by mechanical alloying. X-ray diffraction, scanning electron microscopy, transmission electron microscopy observations and microhardness measurements have been used to study the effects of milling tools on the phase, microstructure and property of the composites. The results revealed that a single-phase nanocrystalline solid solution was obtained using stainless steel vials and balls (Alloy 1). Nevertheless, Cu-7 wt% Nb powders milled by tungsten carbon vials and balls exhibited an amorphous phase (Alloy 2). The as-milled powders were then vacuum hot-pressing sintered. The microstructure of sintered Alloy 1 consisted of Nb nanoparticles and Cu nanograins. Instead, Alloy 2 showed a microstructure with NbC nanoparticles and WC submicron-sized particles dispersed throughout the Cu matrix. Furthermore, Alloy 2 (~ 322 HV) had a higher microhardness than Alloy 1 (~ 302 HV). Cu and Nb powders were used as starting materials to produce Cu-Nb and Cu-NbC-WC composites by mechanical alloying. X-ray diffraction, scanning electron microscopy, transmission electron microscopy observations and microhardness measurements have been used to study the effects of milling tools on the phase, microstructure and property of the composites. The results revealed that a single-phase nanocrystalline solid solution was obtained using stainless steel vials and balls (Alloy 1). Nevertheless, Cu-7 wt% Nb powders milled by tungsten carbon vials and balls exhibited an amorphous phase (Alloy 2). The as-milled powders were then vacuum hot-pressing sintered. The microstructure of sintered Alloy 1 consisted of Nb nanoparticles and Cu nanograins. Instead, Alloy 2 showed a microstructure with NbC nanoparticles and WC submicron-sized particles dispersed throughout the Cu matrix. Furthermore, Alloy 2 (~ 322 HV) had a higher microhardness than Alloy 1 (~ 302 HV).
出处 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2017年第12期1155-1162,共8页 金属学报(英文版)
基金 financially supported by the National Natural Science Foundation of China (No.51401197)
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