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Ti45Zr35Cu5Ni15块体非晶合金动态压缩性能研究
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北京理工大学材料学院

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TG139+.8

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Study On Dynamic Compression Properties Of Ti45Zr35Cu5Ni15 Bulk Metallic Glass
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    摘要:

    通过铜模喷铸法制备了含有少量纳米晶的Ti45Zr35Cu5Ni15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℃)三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2378MPa,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。

    Abstract:

    The Ti45Zr35Cu5Ni15 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 ℃), respectively. 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 exhibited maximum dynamic compressive strength and plastic deformation at -80℃, and the maximum compressive strength reached 2378MPa when the plastic strain reached 12% , which exhibited excellent mechanical strength and toughness. Furthermore , uncommon profuse wrinkles were also found on the fracture surface. The mechanical properties of the materials were similar at room temperature and liquid nitrogen temperature. The maximum compressive strength was around 1600MPa while the plastic strain reached about 8%, and the river pattern on the fracture surface of the material could also be observed. In addition , the material showed strain softening at room temperature and strain rate strengthening at low temperature to a certain extent.

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陈娜,程焕武,孙驰,沈永华,王扬卫,王迎春,李硕,刘娟. Ti45Zr35Cu5Ni15块体非晶合金动态压缩性能研究[J].稀有金属材料与工程,2021,50(11):4128~4134.[Chen Na, Cheng Huanwu, Sun Chi, Shen Yonghua, Wang Yangwei, Wang Yingchun, Li Shuo, Liu Juan. Study On Dynamic Compression Properties Of Ti45Zr35Cu5Ni15 Bulk Metallic Glass[J]. Rare Metal Materials and Engineering,2021,50(11):4128~4134.]
DOI:10.12442/j. issn.1002-185X.20200934

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  • 收稿日期:2020-12-03
  • 最后修改日期:2021-03-07
  • 录用日期:2021-04-15
  • 在线发布日期: 2021-11-30
  • 出版日期: 2021-11-24