熔体过热和脉冲磁场协同处理对Mn_(5)Si_(3)增强Cu-35Zn-3Al合金显微组织、力学和耐磨性能的影响  

Tailoring microstructure,mechanical and wear properties of Mn_(5)Si_(3) reinforced Cu−35Zn−3Al alloy via melt superheat combined with pulsed magnetic field

作　　者：李航 牛冬涛 张忠涛 杨帆 王红霞[1] 程伟丽[1] Hang LI;Dong-tao NIU;Zhong-tao ZHANG;Fan YANG;Hong-xia WANG;Wei-li CHENG(School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Golden Dragon Precise Copper Tube Group Inc,Chongqing 404100,China)

机构地区：[1]太原理工大学材料科学与工程学院,太原030024 [2]金龙精密铜管有限公司,重庆404100

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第3期918-934,共17页中国有色金属学报（英文版）

基　　金：the supports of the National Natural Science Foundation of China (No. 51901153);Natural Science Foundation of Shanxi Province,China (No. 201901D211096)。

摘　　要：研究熔体过热和脉冲磁场协同处理对Mn_(5)Si_(3)增强Cu-35Zn-3Al合金显微组织、力学和耐磨性能的影响。研究结果表明,协同处理促进了熔体中的溶质迁移以及Mn_(5)Si_(3)晶体生长的吸附动力学,抑制了六棱柱形貌Mn_(5)Si_(3)颗粒上孔洞的形成。协同处理后热锻态合金的抗拉强度和伸长率分别提高了9.0%和66.5%,这是由于拉伸变形过程中不含孔洞的Mn_(5)Si_(3)颗粒断裂强度提高,产生的应力集中减小,因此失效方式由脆性解理断裂转变为从基体中拔出,颗粒和基体间的载荷传递作用增强。在承受摩擦时,协同处理后合金的磨损亚表层中Mn_(5)Si_(3)颗粒不易发生剪切断裂,抑制了裂纹扩展和材料剥落,因而产生的剥层磨损减小,合金耐磨性显著提高。The effects of melt superheat and pulsed magnetic field on the microstructure,mechanical and wear properties of the Mn_(5)Si_(3) reinforced Cu-35Zn-3Al alloy were investigated.The results indicate that after the combined treatments,the hollow formation on the prism-shaped Mn_(5)Si_(3) particles is inhibited,due to the enhanced solute migration in melt and promoted adsorption kinetics for crystal growth.The tensile strength and elongation of the forged alloy increase by 9.0%and 66.5%,respectively.The failure type of Mn_(5)Si_(3) particles during tension transfers from brittle cleavage fracture to pulling out of the matrix due to the higher fracture strength with diminished stress concentration,which leads to enhanced reinforcement of matrix/particle load transfer.The wear resistance of alloy is significantly improved because of reduced delamination wear,since the severe shear fracture on the Mn_(5)Si_(3) particles with hollows under friction induced plastic deformation is restrained,alleviating the subsurface originated crack propagation and spalling.

关 键 词：复杂黄铜 Mn_(5)Si_(3)相 脉冲磁场 强化机理 耐磨性 

分 类 号：TG146.11[一般工业技术—材料科学与工程]