相分离Cu-Zr-Al-Nb非晶合金的塑性变形行为及增韧机理  

Plastic deformation behavior and toughening mechanism of phase-separated Cu-Zr-Al-Nb amorphous alloy

作　　者：陈双双 崔家乐 邢栋 边博凯 洪泽源 程万林 苑和锋 CHEN Shuangshuang;CUI Jiale;XING Dong;BIAN Bokai;HONG Zeyuan;CHENG Wanlin;YUAN Hefeng(School of Materials Science and Engineering,Anhui University of Technology,Ma’anshan 243002,China;Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,Anhui University of Technology,Ma’anshan 243002,China;Ningbo Xingye Shengtai Group Co.,Ltd,NingBo 315336,China;College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)

机构地区：[1]安徽工业大学材料科学与工程学院,马鞍山243032 [2]安徽工业大学教育部先进金属材料绿色制造与表面技术重点实验室,马鞍山243002 [3]宁波兴业盛泰集团有限公司,宁波315336 [4]南京航空航天大学材料科学与技术学院,南京211106

出　　处：《中国有色金属学报》2024年第7期2273-2282,共10页The Chinese Journal of Nonferrous Metals

基　　金：安徽省重点研发计划资助项目(202004b11020010);科技部特殊服役环境的智能装备制造国际科技合作基地重点类开放课题(ISTC2022KF01);安徽省教育厅自然科学基金资助项目(2023AH051111);教育部先进金属材料绿色制造与表面技术重点实验室开放课题(GFST2022ZR10);大学生创新创业训练计划资助项目(202210360025,S202210360182)。

摘　　要：本文采用铜模喷铸法制备Cu_(48-x)Zr_(46.2)Al_(5.8)Nb_(x)(x=0,1.5,3)系列非晶合金,研究了Nb元素的添加对其微观结构和力学性能的影响。结果表明:随着Nb含量的增加,合金成分向两个非晶相的亚稳混溶间隙移动。当Nb含量为3%(摩尔分数)时,在快速凝固的过程中发生相分离,形成富Cu和富Zr非晶相。相分离非晶合金表现出良好的力学性能,其抗压强度和塑性应变分别达到(2193±14)MPa和(11.98±2.25)%。相分离非晶合金的塑性变形能力与两个非晶相之间的剪切模量差异(ΔG)大小有关;当ΔG较小时,“剪切转变区”的形成动力学很相似,它们就会往相邻的非晶相扩展,最终使剪切带分布在整个材料表面。In this study,Cu_(48-x)Zr_(46.2)Al_(5.8)Nb_(x)(x=0,1.5,3)amorphous alloys were prepared via copper-mold injection casting method and the effect of Nb element addition on their microstructures and mechanical properties were investigated.The results show that,as the Nb content increases,the alloy composition shifts toward the metastable miscibility gap of the two glassy phases.When the Nb content is 3%(mole fraction),phase separation into Cu-rich and Zr-rich glassy phases takes place during rapid solidification.The bulk amorphous alloy composed of two glassy phases exhibits good mechanical properties,with compressive strength and plastic strain of(2193±14)MPa and(11.98±2.25)%,respectively.The plastic deformation ability of phase-separated amorphous alloys is closely related to the difference in shear modulus(ΔG)between two amorphous phases.When(ΔG)is small,the formation dynamics of the“shear transition zones”will be very similar,and they can propagate into adjacent amorphous phase,ultimately leading to the distribution of the shear bands throughout the material surface.

关 键 词：非晶合金 相分离 塑性 剪切带 剪切模量 

分 类 号：TG139[一般工业技术—材料科学与工程]