Page 22 - 《爆炸与冲击》2026年第3期
P. 22
第 46 卷 陈嘉琳,等: 重复冲击载荷下Al 0.3 CoCrFeNi高熵合金的动态响应机制与累积损伤效应 第 3 期
循线性演化方程为 l =3 162.8v −1 239.9(式中 l 的单位为 nm,v 的单位为 km/s),但在更高首次冲击速度
1
f
i
i1
f
下,由于板厚限制,位错线长度出现减小。HEA 板内的应力分布随刚性球首次冲击速度的升高而扩展,
最大应力与首次冲击速度呈二次函数关系 σ =−14.48v +114.04 v 2 i1 +29.02(式中 σ 的单位为 GPa,v 的单
1
1
1
i
i1
位为 km/s),塑性区域边界应力与首次冲击速度也呈二次函数关系 σ =2.81v −0.42 v 2 i1 +9.44(式中 σ 的单
2
i1
2
位为 GPa,v 的单位为 km/s)。
1
i
(3) 首次冲击对二次冲击的影响:首次冲击在几何特征、变形机制和弹道极限方面对二次冲击的影
响 显 著 。 HEA 板 在 刚 性 球 首 次 冲 击 后 呈 现 类 梯 形 的 破 坏 区 域 , 其 几 何 特 征 与 冲 击 速 度 的 关 系 为
v 2 +2.67(式中 r 的单位为 nm,v 的单位为 km/s),d =d +2h cot θ,刚性球二次冲击的最小影
1
i1 i1 i 2 1
r=3.29v −0.45
响范围与首次冲击存在关系 L=d /2+ d 2 ′ /2。因此,在已知首次冲击速度和二次冲击速度的情况下,可以确
2
定二次冲击不受首次冲击影响、且毁伤无叠加作用的最小距离 L =−0.45( v +v 2 i2 )+3.29(v +v )+2h cot θ+
2
min
i1
i1
i2
5.34(式中 L n 的单位为 nm,v 的单位为 km/s,v 的单位为 km/s,h 的单位为 nm,θ 的单位为 (°));刚性球
2
1
mi i i
首次冲击速度越高,二次冲击后的剩余速度越高,HEA 板材料的抵抗能力越低,在距离首次冲击中心
10 nm 处的弹道极限越低,与首次冲击速度的关系为 v bl = −0.008 6e v i1 /0.769 +1.383 6 (式中 v 的单位为 km/s,
l
b
v 的单位为 km/s)。然而,随着二次冲击速度的提高,首次冲击对 HEA 板的影响减弱。
1
i
参考文献:
[1] DU M, LIU B, LIU Y, et al. Dynamic behavior of additively manufactured FeCoCrNi high entropy alloy [J]. Metals, 2023,
13(1): 75. DOI: 10.3390/met13010075.
[2] HE J Y, WANG Q, ZHANG H S, et al. Dynamic deformation behavior of a face-centered cubic FeCoNiCrMn high-entropy
alloy [J]. Science Bulletin, 2018, 63(6): 362–368. DOI: 10.1016/j.scib.2018.01.022.
[3] SONG S W, LI H T, LIU P W, et al. Dynamic shock response of high-entropy alloy with elemental anomaly distribution [J].
International Journal of Mechanical Sciences, 2023, 253: 108408. DOI: 10.1016/j.ijmecsci.2023.108408.
[4] WU Y Q, LIAW P K, LI R X, et al. Relationship between the unique microstructures and behaviors of high-entropy alloys [J].
International Journal of Minerals, Metallurgy and Materials, 2024, 31(6): 1350–1363. DOI: 10.1007/s12613-023-2777-4.
[5] LI Z Z, ZHAO S T, RITCHIE R O, et al. Mechanical properties of high-entropy alloys with emphasis on face-centered cubic
alloys [J]. Progress in Materials Science, 2019, 102: 296–345. DOI: 10.1016/j.pmatsci.2018.12.003.
[6] CAO T Q, ZHANG Q, WANG L, et al. Dynamic deformation behaviors and mechanisms of CoCrFeNi high-entropy alloys [J].
Acta Materialia, 2023, 260: 119343. DOI: 10.1016/j.actamat.2023.119343.
[7] FAN H D, WANG Q Y, EL-AWADY J A, et al. Strain rate dependency of dislocation plasticity [J]. Nature Communications,
2021, 12(1): 1845. DOI: 10.1038/s41467-021-21939-1.
[8] JIANG K, LI J G, KAN X K, et al. Adiabatic shear localization induced by dynamic recrystallization in an FCC high entropy
alloy [J]. International Journal of Plasticity, 2023, 162: 103550. DOI: 10.1016/j.ijplas.2023.103550.
[9] SHEN Y X, SPEAROT D E. Mobility of dislocations in FeNiCrCoCu high entropy alloys [J]. Modelling and Simulation in
Materials Science and Engineering, 2021, 29(8): 085017. DOI: 10.1088/1361-651X/ac336a.
[10] HAN Y, LI H B, FENG H, et al. Mechanism of dislocation evolution during plastic deformation of nitrogen-doped
CoCrFeMnNi high-entropy alloy [J]. Materials Science and Engineering: A, 2021, 814: 141235. DOI: 10.1016/j.msea.2021.
141235.
[11] LI Z M, TASAN C C, SPRINGER H, et al. Interstitial atoms enable joint twinning and transformation induced plasticity in
strong and ductile high-entropy alloys [J]. Scientific Reports, 2017, 7: 40704. DOI: 10.1038/srep40704.
[12] SHI K W, CHENG J C, CUI L, et al. Ballistic impact response of Fe 40 Mn 20 Cr 20 Ni 20 high-entropy alloys [J]. Journal of Applied
Physics, 2022, 132(20): 205105. DOI: 10.1063/5.0130634.
[13] SONAR T, IVANOV M, TROFIMOV E, et al. An overview of microstructure, mechanical properties and processing of high
entropy alloys and its future perspectives in aeroengine applications [J]. Materials Science for Energy Technologies, 2024, 7:
35–60. DOI: 10.1016/j.mset.2023.07.004.
[14] FARAHANI M G, RIZI M B, AGHAAHMADI M, et al. Activation of different twinning mechanisms and their contributions
031401-19

