Microstructural evolution and energetic characteristics of TiZrHfTa_(0.7)W_(0.3)high-entropy alloy under high strain rates and its application in high-velocity penetration

作     者：Weiqi Tang Kun Zhang Tianyu Chen Qiu Wang Bingchen Wei Weiqi Tang;Kun Zhang;Tianyu Chen;Qiu Wang;Bingchen Wei

作者机构：Key Laboratory of Microgravity(National Microgravity Laboratory)Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering ScienceUniversity of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of High Temperature Gas DynamicsInstitute of MechanicsChinese Academy of SciencesBeijing 100190China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2023年第132卷第1期

页      面：144-153页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natu-ral Science Foundation of China(Nos.51401028,51271193 and 11790292) the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB22040303) the Innovation Pro-gram(No.237099000000170004) 

主　　题：Energetic structural materials High-entropy alloys Phase transformation Ballistic tests 

摘      要：Energetic structural materials(ESMs)integrated a high energy density and rapid energy release with the ability to serve as structural ***,a novel triple-phase TiZrHfTa_(0.7)W_(0.3)high-entropy alloy(HEA)was fabricated and investigated as a potential ESM.A hierarchical microstructure was obtained with a main metastable body-centered-cubic(BCC)matrix with distributed Ta-W-rich BCC precipitates of various sizes and interwoven hexagonal close-packed(HCP)lamellar *** compressive me-chanical properties were tested across a range of strain rates and demonstrated a brittle-to-ductile tran-sition as the strain rate increased while maintaining a high ultimate strength of approximately 2.5 *** was due to the phase transformation from metastable matrix BCC to HCP *** addition,during the dynamic deformation,metal combustion originating from the failure surface was ***,the composition of the fragments was studied,and the results indicated that the addition of tungsten promoted ***,the potential application of this HEA was evaluated by high-velocity penetration tests,and the results were compared to other typical structural materials for pene-trators and bullets.A comparison was conducted by assessing the geometries of the penetration channel employing two dimensionless parameters normalized by the projectile size,representing longitudinal and lateral damage,*** normalized depth of the TiZrHfTa_(0.7)W_(0.3)HEA projectile was comparable to those of the other investigated materials,but the normalized diameter was the largest,showing an excellent ability to deliver lateral damage.