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Compressive Mechanical Properties and Shock-Induced Reaction Behavior of a Ti–29Nb–13Ta–4.6Zr Alloy
Zhiping Guo,Ran Liu,Chuan Ting Wang,Yong He,Yuan He,Yue Ma,Xuebing Hu 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.10
The compressive mechanical properties of a Ti–29Nb–13Ta–4.6Zr alloy were investigated at room temperature under variousstrain rates. The parameters of a modified Johnson–Cook constitutive equation were determined to describe the strainsoftening behavior under dynamic conditions. The testing results under compression show yield strength evidently increaseswith the increase of the strain rate. Moreover, it was found that the strain-rate effect of the yield strength upon dynamicdeformation is more significant than that upon quasi-static deformation. In order to characterize the impact-initiated reactionbehavior of Ti–29Nb–13Ta–4.6Zr alloy, the quasi-sealed test chamber was used to measure the pressure caused by energyreleased of fragments. It was obviously shown that the exothermic chemical reaction was more intense with the increase ofimpact velocity.
Strain Rate Effects on the Mechanical Properties of an AlCoCrFeNi High-Entropy Alloy
Chuan Ting Wang,Yong He,Zhiping Guo,Xiaohui Huang,Ying Chen,Houan Zhang,Yuan He 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
The efect of strain rate on the compressive properties of an AlCoCrFeNi high-entropy alloy (HEA) was investigated. Microstructure of the AlCoCrFeNi HEA was observed using scanning transmission microscopy (SEM) and transmission electronmicroscopy. The results showed formation of a homogeneous two-phase structure. Quasi-static compression was testedunder initial engineering strain rates between 10–4 and 10–2 s−1. Engineering compression stress of exceeding 2500 MPaand ductility of around 12% was achieved. Dynamic mechanical behavior at room temperature was characterized by a splitHopkinson pressure bar under strain rates between 1350 and 4000 s−1. The AlCoCrFeNi HEA exhibited high strain ratesensitivity, especially under dynamic compression. The fuctuation of yield strength and the variation of strain rate hardening with strain rate was investigated. The various parameters of a constitutive equation for deformation of the AlCoCrFeNiHEA were obtained from the experimental data. The constitutive equations can be applied to predict the strength of alloyunder various stain rates.