不锈钢网增强锆基非晶复合材料的压铸制备及力学性能  

HPDC Forming and Mechanical Properties of Stainless-Steel Skeleton Reinforced Zr-Based Bulk Metallic Glass Composites

作　　者：高望峻 翟继婷 张卫文[1,2] 杨超[1,2] 张涛 李卫荣 李扬德 刘乐华[1,2] Gao Wangjun;Zhai Jiting;Zhang Weiwen;Yang Chao;Zhang Tao;Li Weirong;Li Yangde;Liu Lehua(National Engineering Research Center for Near-net Forming of Metal Materials,South China University of Technology,Guangzhou 510641,China;Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials,School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,China;Institute of Eontech New Materials Co.,Ltd,Dongguan 523662,China)

机构地区：[1]华南理工大学国家金属材料近净成形工程技术研究中心,广东广州510641 [2]华南理工大学机械与汽车工程学院广东省金属材料加工与成形重点实验室,广东广州510640 [3]宜安新材料有限公司研究院,广东东莞523662

出　　处：《稀有金属材料与工程》2022年第11期4197-4206,共10页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(52001123);中国博士后科学基金(2019TQ0099,2019M662908);广东省基础与应用基础研究基金(2019A1515110215);中央高校基本科研业务费(2020ZYGXZR030);广东省普通高校青年创新人才类项目(2019KQNCX003);广东省基础与应用基础研究重大项目(2019B030302010)。

摘　　要：利用压铸工艺高速充型及高压凝固的特性,通过在Vit1锆基非晶合金中引入304不锈钢网叠层焊接制造的骨架,成功制备出了不同体积分数晶态相增强的非晶复合材料,并研究了不锈钢网体积分数对力学性能的影响。结果表明,不锈钢网在非晶基体中均匀分布,与非晶合金存在冶金界面结合。力学性能测试显示,随着不锈钢编织网的引入,室温脆性的压铸Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5)(Vit1)块体金属玻璃的塑性得到了显著提升。随着不锈钢网目数增大(对应晶态相体积分数增大),非晶复合材料的塑性呈增大的趋势,但是,当目数超过200目时,过细的孔洞会导致骨架局部区域无法填充,恶化性能。当晶态相的体积分数为53.7%时,断裂应变达到最大值,约为10%,其值高于传统不锈钢纤维增韧的Zr基非晶复合材料。韧化机制分析表明,压铸非晶合金出现脆-延性转变的根本原因是不锈钢网对剪切带扩展进行高效抑制,促进剪切带的增殖和萌生,减少宏观塑性变形的局域化。本研究为非晶复合材料的结构设计提供了新的思路,对于促进非晶合金的更广泛应用具有一定的指导价值。304 stainless steel skeletons were introduced into Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5)(Vit1)bulk metallic glasses(BMGs)by high pressure die casting(HPDC)technique under high pressure and with large filling rate to create BMG/stainless steel composites.Furthermore,the effects of stainless-steel volume fraction on the microstructure and mechanical properties were studied.The results show that the stainless steel skeleton in the HPDCed composites is uniformly distributed in the metallic glassy matrix and displays metallurgical interface with the Vit1 BMG.The mechanical properties test indicates that the plasticity of the brittle Vit1 BMG is significantly improved with the introduction of stainless steel skeleton.As the mesh number of stainless steel increase s(corresponding to the increase of the volume fraction of crystalline phase),the plasticity of composites displays an increasing trend.However,when the mesh number exceeds 200,there are some deteriorations in mechanical properties due to the unfilled porosity defects in the composites.When the volume fraction of crystalline phase is about 53.7%,the fracture strain of composites reaches the maximu m value of about 10%,which is much higher than that of Zr-based BMG composites toughened by traditional stainless steel fibers.The analysis of the toughening mechanism shows that the brittle-ductility transition of the HPDCed Vit1 BMGs mainly results from high efficiency suppression of shear band propagation by metal skeleton,which promotes the proliferation and initiation of shear bands and reduce s the localization of macroscopic plastic deformation,as well as the reduced stress concentration due to decrease of mesh number.This study provides new insights for the design and preparation of BMGs composites with excellent mechanical properties,and has important engineering value for appli cation of BMGs.

关 键 词：非晶复合材料 压铸 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程]