高密度合金W-Ni-Mn的绝热剪切破坏研究

Study on adiabatic shear failure of W-Ni-Mn heavy alloy

1.
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China

摘要: 应用分离式霍普金森压杆对90W-Ni-Mn合金的圆柱体试样进行了动态压缩实验，并对试样的剖面和断面进行了扫描电镜观察，结合试样的真实应力-应变曲线，发现合金在真实应变为约45％时出现明显的绝热剪切现象，随着冲击力的进一步增加，试样发生剪切断裂。可见90W-Ni-Mn合金较传统钨合金更易出现剪切带，具有更高的绝热剪切敏感性。
- 固体力学 /
- 绝热剪切带 /
- 分离式霍普金森压杆 /
- 高密度钨合金
Abstract: Dynamic compression tests of W-Ni-Mn alloy were performed, using cylindrical specimens 5 mm both in diameter and long with the split Hopkinson pressure bar (SHPB) technique. Both sections and fracture surfaces of specimens were observed with SEM. Connected with true stress-strain curves of specimens, it was found that adiabatic shear bands in sections of specimens appeared distinctly when specimens took place about 45% true strain. W-Ni-Mn alloy is easier to come into being adiabatic shear band(ASB) than the conventional tungsten heavy alloy, and has higher adiabatic shear sensitivity.
- solid mechanics /
- adiabatic shear band(ASB) /
- split Hopkinson bar /
- tungsten heavy alloy