Laves-phase are among the most abundant groups of alloys with chemical formula AB_(2),known for their hightemperature strength and potential application in hydrogen storage.The Laves-phase generally acts as a strength...Laves-phase are among the most abundant groups of alloys with chemical formula AB_(2),known for their hightemperature strength and potential application in hydrogen storage.The Laves-phase generally acts as a strengthening agent,which enhances the strength and durability of alloys at extreme conditions.Consequently,the properties of Lavesphase alloys at extreme conditions attract wide attention.In this study,we investigated the high-pressure phase diagram of Laves-phase alloy HfZn_(2),and discovered a phase transition from C15(space group Fd3m)phase to C14(space group P63/mmc)phase at a pressure above 20 GPa.Based on ab initio simulations,the mechanical,chemical bonding and superconducting properties of high-pressure phase HfZn_(2)were predicted.The ratio of bulk modulus to shear modulus(B/G),a key indicator of mechanical properties in alloys,increases from 1.86 to 4.09 within the pressure range of 50-250 GPa,indicating excellent ductility of the C14 phase of HfZn_(2)under high pressure.Additionally,Zn gains approximately 0.43 electron from Hf at 10 GPa,and the superconducting critical temperature of HfZn_(2)is estimated to be around 0.55 K at 50 GPa.Given that both C14 and C15 phases are common structures in Laves-phase alloys,elucidating the high-pressure behaviors of C14 and C15 phases of HfZn_(2)will enhance the fundamental understanding of properties and potential applications at extreme conditions of Laves-phase alloys.展开更多
A new point of view on the homogenization treatment has been proposed.It is supposed that a little liquid in the alloy may promote the homogenization process in some aspects and reduce the time for eliminating the Lav...A new point of view on the homogenization treatment has been proposed.It is supposed that a little liquid in the alloy may promote the homogenization process in some aspects and reduce the time for eliminating the Laves-phase in alloy GH169.The microprocess of the elimination of Laves-phase in the case of a little liquid existing in the alloy has also been described.展开更多
Effects of cold rolling on the microstructure and mechanical properties of Fe-Ni-Mn-Mo-Ti-Cr maraging steels were studied.To investigate the microstructure and mechanical properties,optical microscopy,scanning electro...Effects of cold rolling on the microstructure and mechanical properties of Fe-Ni-Mn-Mo-Ti-Cr maraging steels were studied.To investigate the microstructure and mechanical properties,optical microscopy,scanning electron microscopy,X-ray diffraction,tensile test,and hardness test were used.The results show that the solution-annealing treatment in the cold-rolled steel redounds to the formation of sub-microcrystalline Fe2（Mo,Ti） Laves phase particles,which are stable at high temperatures.These secondary Laves phase particles prevent from recrystallization at high temperatures and correspond to semi-brittle fracture in the subsequent aging treatment.展开更多
基金supported by the Guangxi Natural Sci-ence Foundation(Grant Nos.2025GXNSFAA069277 and GuikeAD23026204).
文摘Laves-phase are among the most abundant groups of alloys with chemical formula AB_(2),known for their hightemperature strength and potential application in hydrogen storage.The Laves-phase generally acts as a strengthening agent,which enhances the strength and durability of alloys at extreme conditions.Consequently,the properties of Lavesphase alloys at extreme conditions attract wide attention.In this study,we investigated the high-pressure phase diagram of Laves-phase alloy HfZn_(2),and discovered a phase transition from C15(space group Fd3m)phase to C14(space group P63/mmc)phase at a pressure above 20 GPa.Based on ab initio simulations,the mechanical,chemical bonding and superconducting properties of high-pressure phase HfZn_(2)were predicted.The ratio of bulk modulus to shear modulus(B/G),a key indicator of mechanical properties in alloys,increases from 1.86 to 4.09 within the pressure range of 50-250 GPa,indicating excellent ductility of the C14 phase of HfZn_(2)under high pressure.Additionally,Zn gains approximately 0.43 electron from Hf at 10 GPa,and the superconducting critical temperature of HfZn_(2)is estimated to be around 0.55 K at 50 GPa.Given that both C14 and C15 phases are common structures in Laves-phase alloys,elucidating the high-pressure behaviors of C14 and C15 phases of HfZn_(2)will enhance the fundamental understanding of properties and potential applications at extreme conditions of Laves-phase alloys.
文摘A new point of view on the homogenization treatment has been proposed.It is supposed that a little liquid in the alloy may promote the homogenization process in some aspects and reduce the time for eliminating the Laves-phase in alloy GH169.The microprocess of the elimination of Laves-phase in the case of a little liquid existing in the alloy has also been described.
文摘Effects of cold rolling on the microstructure and mechanical properties of Fe-Ni-Mn-Mo-Ti-Cr maraging steels were studied.To investigate the microstructure and mechanical properties,optical microscopy,scanning electron microscopy,X-ray diffraction,tensile test,and hardness test were used.The results show that the solution-annealing treatment in the cold-rolled steel redounds to the formation of sub-microcrystalline Fe2（Mo,Ti） Laves phase particles,which are stable at high temperatures.These secondary Laves phase particles prevent from recrystallization at high temperatures and correspond to semi-brittle fracture in the subsequent aging treatment.
