期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
Microstructures and mechanical properties of laser-directed energy deposited CrCoNi medium-entropy alloy
1
作者 Wen-Jie Zhao Chang-Yu Liu +5 位作者 Peng-Cheng Che Zhi-Liang Ning hong-bo fan Jian-Fei Sun Yong-Jiang Huang Alfonso H.W.Ngan 《Rare Metals》 SCIE EI CAS CSCD 2024年第7期3286-3300,共15页
The distinctive intrinsic heat treatment(IHT)originating from cyclic reheating in the laser-directed energy deposition(LDED) has attracted growing attention in recent years.In this investigation,simulations and experi... The distinctive intrinsic heat treatment(IHT)originating from cyclic reheating in the laser-directed energy deposition(LDED) has attracted growing attention in recent years.In this investigation,simulations and experimental characterizations were performed to examine the impact of IHT on the micros true ture and mechanical properties of LDED-fabricated CrCoNi medium-entropy alloy(MEA).The results show that the intensity of the IHT is proportional to the utilized laser energy density(LED).As the LED increased,significant dynamic recrystallization and grain refinement occurred within the alloy due to the enhanced intensity of IHT.However,the high LED leads to severe hot cracking within the as-built MEA,resulting in inferior ductility.By decreasing LED,the hot cracking was effectively eliminated.Meanwhile,low LED weakened the intensity of IHT and consequently inhibited kinetic conditions of dynamic recrystallization,resulting in a heterogeneous grain structure characterized by multi-scale-sized grains.This structure provides significant hetero-deformation-induced hardening during plastic deformation,enabling the alloy to have a sustainable work-hardening capacity.We expect that this work will have implications in taking full advantage of the unique IHT of the LDED process to fabricate ME As with excellent metallurgical quality and mechanical performance. 展开更多
关键词 Intrinsic heat treatment Laser-directed energy deposition CrCoNi MEA Dynamic recrystallization Heterogeneous grain structure
原文传递
Enhanced tensile properties and wear resistance of additively manufactured CoCrFeMnNi high-entropy alloy at cryogenic temperature 被引量:5
2
作者 Hong-Ge Li Peng-Cheng Che +4 位作者 Xiao-Kun Yang Yong-Jiang Huang Zhi-Liang Ning Jian-Fei Sun hong-bo fan 《Rare Metals》 SCIE EI CAS CSCD 2022年第4期1210-1216,共7页
Here,bulk CoCrFeMnNi high-entropy alloy was prepared via laser melting deposition,and its microstructure and mechanical properties at room and cryogenic temperature were investigated by a series of microstructural cha... Here,bulk CoCrFeMnNi high-entropy alloy was prepared via laser melting deposition,and its microstructure and mechanical properties at room and cryogenic temperature were investigated by a series of microstructural character-izations and mechanical tests.The results showed that the as-built samples possessed a single fcc phase and highly dense microstructures.Compared to the mechanical prop-erties at room temperature,tensile properties,microhard-ness and wear resistance of the as-built samples showed a signiflcant enhancement at cryogenic temperature,which was attributed to the deformation mechanism converting from dislocation slipping to deformation twinning at cryogenic temperature.The formation of deformation nanotwins signiflcantly improved the deformation resis-tance in cryogenic conditions,and the sliding wear in the liquid nitrogen could decrease the oxygen concentration,suppress the generation of oxide particles and thus enhance the wear resistance. 展开更多
关键词 WEAR CRYOGENIC ALLOY
原文传递
Crystallization of a Ti-based Bulk Metallic Glass Induced by Electropulsing Treatment 被引量:3
3
作者 Yong-jiang HUANG Xiang CHENG +3 位作者 hong-bo fan Shi-song GUAN Zhi-liang NING Jian-fei SUN 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2016年第1期69-73,共5页
The effect of electropulsing treatment(EPT)on the microstructure of a Ti-based bulk metallic glass(BMG)has been studied.The maximum current density applied during EPT can exert a crucial role on tuning the microst... The effect of electropulsing treatment(EPT)on the microstructure of a Ti-based bulk metallic glass(BMG)has been studied.The maximum current density applied during EPT can exert a crucial role on tuning the microstructure of the BMG.When the maximum current density is no more than 2 720A/mm^2,the samples retains amorphous nature,whereas,beyond that,crystalline phases precipitate from the glassy matrix.During EPT,the maximum temperature within the samples EPTed at the maximum current densities larger than 2 720A/mm^2 is higher than the crystallization temperature of the BMG,leading to the crystallization event. 展开更多
关键词 bulk metallic glass electropulsing transmission electron microscopy crystallization microstructure
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部