Page 101 - 《爆炸与冲击》2026年第3期

第 46 卷 郑贺龄，等： (Ti 2 Zr) 1.5 NbVAl 0.5 高熵合金的动态响应与冲击释能机理 第 7 期

High-velocity penetration

Dislocation slip localization

Dominant slip mode

Local cross
Planar slip slip
dominance activation

Dislocation single Increased dislocation Multifaceted slip of Adiabatic temperature rise breaks
slip system slip pile-up density screw dislocations through the aggregation energy barrier

Intensified strain Continuous dynamic Thermal softening
hardening competition effect

Dynamic recovery Continuous accumulation Local lattice Time scale
suppression of stored energy reorganization limitation (μs)

Formation of {111} Failure to form a uniform
diffuse texture Dislocation Insufficient dislocation network Absence of dynamic
homogeniza thermal recrystallization
{222}ND density tion failure diffusion Failure to form a sustained conditions
decrease high-temperature region
Pseudo-dynamic
recrystallization signal
Adiabatic shear band Formation of {110}
burst 45° annular texture Falsification

High local Dislocation
shear strain saturation

Microcrack nucleation and dissociation along the
adiabatic shear band interface

Macrocrack formation, structural fragmentation, energy
release, and macroscopical spalling failure

图 17 高速侵彻下合金内部演化机制
Fig. 17 Evolution mechanism of the internal structure of
alloys under high-velocity penetration

3 结 论

制备了一种新型高熵合金 (Ti Zr) NbVAl ，通过对合金力学性能测试与直接弹道试验，系统揭示了
2
0.5
1.5
高熵合金的动态响应与能量释放机制，得到的主要结论如下。
(1) 铸态合金呈现成分均匀的单相体心立方结构，晶格常数为 3.350 1 Å，平均晶粒尺寸为 336.7 μm，
强塑性协同效应显著。当应变速率从 0.001 s 升至 0.1 s 时，屈服强度由 885.2 MPa 升至 976.4 MPa。与
−1
−1
准静态相比，动态下合金的屈服强度提升 123%，最高达 1 977.3 MPa（6 000 s ），且低温下对应变速率展现
−1
出更高的敏感性。

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