W_(25)Fe_(25)Ni_(25)Mo_(25)高熵合金高速侵彻细观结构演化特性
EFFECT OF MICROSTRUCTURE ON FLOW BEHAVIOR DURING PENETRATION OF W_(25)Fe_(25)Ni_(25)Mo_(25) HIGH-ENTROPY ALLOY PROJECTILE
查看参考文献31篇
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文摘
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为了探究W_(25)Fe_(25)Ni_(25)Mo_(25)高熵合金弹体在侵彻过程中宏观变形行为与材料微细观结构之间的联系,基于对两相流动模型的简化,建立了考虑软、硬相密度、流速以及浓度差异的等截面直管两相流动演化模型.类比宏观状态下侵彻弹体头部材料的流入流出特性,选定分析区域,建立两相细观结构下材料在分析区域的流入流出关系,再结合细观结构演化方程,给出了分析区域中浓度演化结果,提出了表征材料浓度演化速率的流动稳定系数t/l_(length).为了对比不同细观结构弹体的侵彻行为,选取典型两相材料钨铜合金(W_(70)Cu_(30)),基于小口径弹道枪发射平台开展两种弹体侵彻半无限钢靶试验,对比两种合金弹体细观结构演化行为.结果表明,硬相浓度分布总体上体现"中心浓,边缘稀"的特点;硬相的浓度越高,密度越大,驱动速度越快,则流动稳定系数t/l_(length)值越小,侵彻过程中弹体的流动稳定性越好,弹体头部材料越容易形成连续的塑性流动带.等截面直管两相流动演化模型可用于描述侵彻过程中弹体头部材料的流动稳定性,揭示了侵彻过程中弹体头部变形与细观两相结构之间的关联机制. |
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其他语种文摘
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In order to explore the relationship between the macro deformation behavior of W_(25)Fe_(25)Ni_(25)Mo_(25) high- entropy alloy projectile and the micro structure of the material in the penetration,a two-phase flow evolution model of constant cross-section straight pipe is established.The model takes the differences of soft and hard phase density,velocity and concentration into consideration based on the simplification of the two-phase flow model.By analogy with the inflow and outflow characteristics of the materials at the head of the projectile in the macro state,the analysis area is selected.The inflow and outflow relationship of the materials in the analysis area under the two-phase microstructure is established.Combined with the microstructure evolution equation,the concentration evolution results in the analysis area are given.The flow stability coefficient t/l_(length) characterizing the concentration evolution rate of the materials is proposed.In order to compare the penetration behavior of projectiles with different microstructures,the typical two-phase material tungsten- copper alloy (W_(70)Cu_(30)) was selected to carry out the penetration test of two kinds of projectiles into semi-infinite steel target based on small caliber ballistic gun.The microstructure evolution behavior of the two kinds of alloy projectiles is analyzed.The results show that the distribution of hard phase concentration generally reflects the characteristics of "concentrated in the center and sparse at the edge".The higher the concentration of the hard phase,the higher the density and the faster the driving speed,the smaller the flow stability coefficient t/l_(length).The better the flow stability of the projectile in the penetration,and the easier it is for the projectile head material to form a continuous plastic flow zone.The two-phase flow evolution model of constant cross-section straight pipe can be used to describe the flow stability of projectile head material in the process of penetration,and reveal the correlation mechanism between projectile head deformation and two-phase microstructure in the process of penetration. |
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来源
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力学学报
,2022,54(8):2140-2151 【核心库】
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DOI
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10.6052/0459-1879-22-128
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关键词
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高熵合金
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高速侵彻
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细观结构
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两相流动
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地址
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南京理工大学机械工程学院, 南京, 210094
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上海机电工程研究所, 上海, 201109
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中国科学院力学研究所, 非线性力学国家重点实验室, 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0459-1879 |
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学科
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力学;武器工业 |
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基金
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国家自然科学基金
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国家自然科学基金委员会-中国工程物理研究院“NSAF联合基金”
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文献收藏号
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CSCD:7292450
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