Xiaying Ma , Kerong Ren , Rong Chen , Shun Li , Jiaqiang Wu
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引用次数: 0
Abstract
The micro-structure, dynamical compression property and spallation behaviour were investigated in TiZrHf refractory multi-principal element alloy (RMPEA) with a single Hexagonal Close-Packed (HCP) phase, considering the spatial heterogeneity between central and peripheral regions. Based on a single-stage gas gun, plate impact experiments were driven with impact velocities ranging from 327 to 710 m·s−1, and results showing the Hugoniot data were c0 = 3.55 km·s−1 and s = 0.97, while the spall strength σspall increased from 1.92 GPa to 2.01 GPa. The shock-response behaviour was accurately predicted using the equation of state derived from a cold-energy mixture model. Microstructural analysis of recovered samples revealed that voids nucleated preferentially at grain boundaries, especially at triple junctions of twin boundaries. As the impact velocity increased, the damage mode shifted from intergranular to a mix of intergranular and intragranular, eventually becoming predominantly intragranular. Additionally, under impact loading, multiple cross-slip and <c+a> type pyramidal dislocations were activated, forming dislocation loops and walls. Moreover, interactions between dislocations and grain boundaries promoted stacking faults (SF) activation, twin formation and HCP-to-Face-Centered Cubic (FCC) phase transformation. Additionally, the self-activated twinning mechanism facilitated the formation of low-energy twins under high strain rates, as stacking fault energy (SFE) became dominant over short-range order (SRO). Comparative data on various MPEAs showed a negative correlation between the yield strength to spall strength ratio (σy/σspall) and valence electron concentration (VEC).
期刊介绍:
Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.