Ti_(45)Zr_(35)Cu_(5)Ni_(15)块体非晶合金动态压缩性能研究  

Dynamic Compression Properties of Ti_(45)Zr_(35)Cu_(5)Ni_(15) Bulk Metallic Glass

作　　者：陈娜 程焕武[1,2] 孙驰 沈永华 王扬卫 王迎春[1] 李硕 刘娟[1] Chen Na;Cheng Huanwu;Sun Chi;Shen Yonghua;Wang Yangwei;Wang Yingchun;Li Shuo;Liu Juan(School of Material Science and Engineering,Beijing Institute of Technology,Beijing 100081,China;National Key Laboratory of Science and Technology on Materials under Shock and Impact,Beijing 100081,China;Chongqing Innovation Center,Beijing Institute of Technology,Chongqing 401120,China)

机构地区：[1]北京理工大学材料学院,北京100081 [2]冲击环境材料技术国家级重点实验室,北京100081 [3]北京理工大学重庆创新中心,重庆401120

出　　处：《稀有金属材料与工程》2021年第11期4128-4134,共7页Rare Metal Materials and Engineering

摘　　要：通过铜模喷铸法制备了含有少量纳米晶的Ti_(45)Zr_(35)Cu_(5)Ni_(15)大块非晶合金。利用分离式霍普金森杆(SHPB)分别对试样进行室温(25℃)、-80℃和液氮温度(-196℃)3种不同温度环境下的高应变率加载动态压缩实验,结合带有能谱的场发射扫描电镜(SEM)观察材料压缩断口的形貌特征。对比分析发现:材料在-80℃下的动态最大抗压强度以及塑性变形最高,最大抗压强度达到2378 MPa,塑性应变达到12%,强韧性配合优异,在材料断口形貌中发现了独特的褶皱特征;材料在室温以及液氮温度下的力学性能相近,最大抗压强度在1600MPa左右,塑性应变达到8%左右,断口中出现了大量的河流花样。材料在室温下表现为应变软化,在低温下表现出一定程度的应变率强化效应。The Ti_(45)Zr_(35)Cu_(5)Ni_(15)bulk metallic glass with a small amount of nanocrystalline was prepared by copper mould injection casting.The dynamic compression properties of the alloy was investigated with the split Hopkinson pressure bar(SHPB)under high strain rates at room temperature(25℃),-80℃and liquid nitrogen temperature(-196℃).The morphology characteristics of the compression fracture were observed by field emission scanning electron microscope(SEM)with energy spectrum.Comparative analysis shows that the material exhibits maximum dynamic compressive strength and plastic deformation at-80℃,and the maximum compressive strength reaches 2378 MPa when the plastic strain reaches 12%,which exhibits excellent mechanical strength and toughness.Furthermore,uncommon profuse wrinkles are also found on the fracture surface.The mechanical properties of the materials are similar at room temperature and liquid nitrogen temperature.The maximum compressive strength is around 1600 MPa while the plastic strain reaches about 8%,and the river pattern on the fracture surface of the material could also be observed.In addition,the material shows strain softening at room temperature and strain rate strengthening to a certain extent at low temperature.

关 键 词：Ti基非晶合金 纳米晶 低温 动态压缩 

分 类 号：TG139.8[一般工业技术—材料科学与工程]