Thermally stable ultrafine grained copper induced by CrB/CrB_(2) microparticles with surface nanofeatures via regular casting

作     者：Gongcheng Yao Chezheng Cao Shuaihang Pan Jie Yuan Igor De Rosa Xiaochun Li Gongcheng Yao;Chezheng Cao;Shuaihang Pan;Jie Yuan;Igor De Rosa;Xiaochun Li

作者机构：Department of Materials Science and EngineeringUniversity of CaliforniaLos AngelesCA 90095USA Department of Mechanical and Aerospace EngineeringUniversity of CaliforniaLos AngelesCA 90095USA 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第58卷第23期

页      面：55-62页

核心收录：

学科分类：07[理学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：University of California  Los Angeles  UCLA 

主　　题：Copper Microparticles with nanofeatures Casting Ultrafine grains Thermal stability 

摘      要：Ultrafine-grained(UFG)/nanocrystalline materials possess novel properties. Refining as-solidified grains of metals to the ultrafine and even nanometer scale by nanoparticles via slow cooling has been recently discovered. Here, we report that microparticles(CrB and CrB_(2)) with surface nanofeatures can also enable ultrafine/nano grains via slow cooling. CrB/CrB_(2) microparticles, formed by coalescence of nanoparticles in Cu matrix, display surface nanofeatures, which induce substantial grain refinement and stabilization down to the ultrafine/nano scale. The UFG Cu/Cr B and Cu/CrB_(2) samples exhibit exceptional thermal stability, comparable to UFG Cu induced by nanoparticles, without coarsening after annealing at 600°C for 1 h. The microhardness, strengths, and Young s moduli of the Cu/Cr B and Cu/CrB_(2) samples are significantly enhanced over pure Cu. This discovery has great potential to advance the mass production UFG/nanocrystalline for widespread applications.