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Characterization of Nucleation Behavior in Temperature-Induced BCC-to-HCP Phase Transformation for High Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2021年第11期34卷 1546-1556页

作者： Xiusong Huang Lehua Liu Weibing Liao Jianjun Huang Huibin Sun Chunyan Yu College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510640China

Phase transformation is one of the essential topics in the studies on high entropy alloys(HEAs).However,characterization of the nucleation behavior in the phase transformation for HEAs is still challenging through experimental *** the present work,hfnbtatizr HEA was chosen as the representative material,and molecular dynamics/Monte Carlo(MD/MC)simulations were performed to investigate the nucleation behavior in temperature-induced BCC-to-HCP transformation for this HEA *** results indicate that Nb–Ta,Ti–Zr,Hf–Zr and Hf–Ti atom pairs are preferred in the BCC solid solution of hfnbtatizr HEA and Hf–Ti–Zr-rich atom cluster with chemical short range order acts as the nucleation site for HCP *** nucleation process follows the non-classical two-step nucleation model:BCC-like structure with severe lattice distortion forms first and then HCP structure nucleates from the BCC-like ***,at low temperature,the BCC-to-HCP nucleation hardly occurs,and the BCC solid solution is *** present work provides more atomic details of the nucleation behavior in temperature-induced BCC-to-HCP phase transformation for HEA,and can help in deep understanding of the phase stability for HEAs.

关键词： Atomistic characterization Nucleation Lattice distortion Chemical short-range order hfnbtatizr High entropy alloys

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Laser metal deposition of refractory high-entropy alloys for high-throughput synthesis and structure-property characterization

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International Journal of Extreme Manufacturing 2021年第1期3卷 98-120页

作者： Henrik Dobbelstein Easo P George Evgeny L Gurevich Aleksander Kostka Andreas Ostendorf Guillaume Laplanche Applied Laser Technologies Ruhr-University BochumUniversitätsstr.15044801 BochumGermany Material Science and Technology Division Oak Ridge National LaboratoryOak RidgeTN 37831-6115United States of America Materials Science and Engineering Department University of TennesseeKnoxvilleTN 37996-2100United States of America Center for Interface-Dominated High Performance Materials Ruhr-University BochumUniversitätsstr.15044801 BochumGermany Institute for Materials Ruhr-University BochumUniversitätsstr.15044801 BochumGermany

Progress in materials development is often paced by the time required to produce and evaluate a large number of alloys with different chemical *** applies especially to refractory high-entropy alloys(RHEAs),which are difficult to synthesize and process by conventional *** evaluate a possible way to accelerate the process,high-throughput laser metal deposition was used in this work to prepare a quinary RHEA,TiZrNbHfTa,as well as its quaternary and ternary subsystems by in-situ alloying of elemental *** graded variants of the quinary RHEA were also *** results show that the influence of various parameters such as powder shape and purity,alloy composition,and especially the solidification range,on the processability,microstructure,porosity,and mechanical properties can be investigated *** strength of these alloys was mainly affected by the oxygen and nitrogen contents of the starting powders,while substitutional solid solution strengthening played a minor role.

关键词： high-entropy alloy hfnbtatizr refractory powder blend laser metal deposition additive manufacturing high-throughput synthesis

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