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Microstructures and mechanical properties of laser-directed energy deposited CrCoNi medium-entropy alloy

Rare Metals 2024年第7期43卷 3286-3300页

作者： Wen-Jie Zhao Chang-Yu Liu Peng-Cheng Che Zhi-Liang Ning Hong-Bo Fan Jian-Fei Sun yong-jiang huang Alfonso H.W.Ngan National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China Space Environment Simulation Research Infrastructure Harbin Institute of TechnologyHarbin 150001China Department of Mechanical Engineering The University of Hong KongHong Kong 999077China

The distinctive intrinsic heat treatment(IHT)originating from cyclic reheating in the laser-directed energy deposition(LDED) has attracted growing attention in recent *** 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 ***,the high LED leads to severe hot cracking within the as-built MEA,resulting in inferior *** decreasing LED,the hot cracking was effectively ***,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 *** structure provides significant hetero-deformation-induced hardening during plastic deformation,enabling the alloy to have a sustainable work-hardening *** 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.

关键词： Intrinsic heat treatment Laser-directed energy deposition CrCoNi MEA Dynamic recrystallization Heterogeneous grain structure

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Higher palaeoelevation in the Baoshan Basin:Implications for landscape evolution at the southeastern margin of the Tibetan Plateau

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Journal of Palaeogeography 2024年第3期13卷 563-580页

作者： yong-jiang huang Hao-Ran Zong Shi-Tao Zhang Arata Momohara Jin-Jin Hu Lin-Bo Jia Yun-Heng Ji Zhe-Kun Zhou Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650201Yunnan ProvinceChina College of Forestry Shandong Agricultural UniversityTai'an 271018Shandong ProvinceChina Faculty of Land Resource Engineering Kunming University of Science and TechnologyKunming 650093Yunnan ProvinceChina Graduate School of Horticulture Chiba UniversityChiba 271-8510Japan Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303Yunnan ProvinceChina

Surface uplift at the southeastern margin of the Tibetan Plateau has been widely studied,but more palaeoaltimetry data are required to better understand the elevation history of this geologically complex *** this study,fossil leaves of Abies(Pinaceae),a cool-temperate element,recovered from the latest Miocene-Pliocene Yangyi Formation of the southern Baoshan Basin,were used as a proxy to estimate the local *** on the regional modern altitude range(2100-4280 m)of the genus as well as regional temperature discrepancy(1.5℃)between the past and present,the palaeoelevation of the study area was calculated to be>2360 m above sea level as compared to 1670 m at *** result suggests that the southern Baoshan Basin experienced pronounced uplift prior to the time of fossil deposition,probably as a result of crustal shortening and thickening of the northern Baoshan Terrane during the *** infer that surface growth in areas south of the Dali Basin may have been greater than previously interpreted,and that a widespread plateau or plateau patches higher than 2000 m probably extended southwards into at least the Baoshan Basin by the latest *** also infer that the elevation of the southern Baoshan Basin has decreased by at least 690 m since then,in contrast to most other scenarios in which the elevation of the southeastern margin of the Tibetan Plateau has increased or remained close to modern levels since the late *** major cause of the inferred altitude decline is likely tectonic *** a transtensional graben basin,the Baoshan Basin has experienced pull-apart and base-fall movement since the late Miocene,which would reduce the altitude of its southern part located on the hanging *** erosion associated with the increased summer rainfall might also have played a role especially in reducing the local relief,although its contribution can be *** study provides one of the few palaeoelevation

关键词： Abies Lapse rate Palaeoaltimetry Surface uplift Tectonic movement Tibetan plateau

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Resistance spot welding of Ti_(40)Zr_(25)Ni_3Cu_(12)Be_(20) bulk metallic glass:experiments and finite element modeling

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Rare Metals 2017年第2期36卷 123-128页

作者： Gang Wang yong-jiang huang Deodat Makhanlall Jun Shen School of Mechanical and Automotive Engineering Anhui Polytechnic University School of Materials Science and Engineering Harbin Institute of Technology

The use of resistance spot welding（RSW）technology for joining Ti40Zr25Ni3Cu12Be20 metallic glass was *** microstructure obtained from the welded BMG sample was *** without precipitates was prepared with welding current of 5.0 kA for 2cycles.A fully coupled thermal-electrical-mechanical finite element model（FEM） was developed to complement the experimental *** simulated results agree well with the *** effects of key process parameters such as welding current and welding time on the evolvement and microstructure of the weldment were determined and ***,the critical cooling rate for preserving the amorphous state in the weld fusion zone is determined to be approximately 1×10^3 K·s^-1.

关键词： Metallic glasses Simulations Resistance spot welding Cooling rate

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Nanoscratching and mechanical behaviors of high-entropy alloys with different phase constituents

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Journal of Iron and Steel Research International 2019年第11期26卷 1240-1248页

作者： jiang-li Ning Yun-li Feng Xu-dong Li Qi-bo Deng yong-jiang huang College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063210HebeiChina Tianjin Key Laboratory of Advanced Functional Porous Materials Institute for New Energy Materials and Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

High-entropy alloys(HEAs)exhibit unique microstructural features and properties in nanoscale and atomic scale because of their multi-element alloy *** nanoscratching behaviors of three HEAs with different phase constituents,relative to the microstructure and mechanical properties of the HEAs,were *** typical phase constituents were selected:face-centered cubic(FCC)structure,body-centered cubic(BCC)structure,and a dual-phase structure containing both FCC and BCC *** the fact that the FCC alloy has the highest ductility and strain hardening capability,it exhibited inferior scratch resistance due to the over-softening of *** to the brittle failure mode,the BCC alloy hardly exhibited desirable scratch resistance despite its highest *** contrast,the nanostructured dual-phase alloy exhibited the best scratch resistance because of its good combination of strength and ductility,as well as the ductile failure *** research suggests that the HEA with structure comprising nanoscale hard and soft phases is desirable for nanoscratch resistance,and possesses appropriate hardness for industrial applications.

关键词： High-entropy alloy Nanoscratch Mechanical property Microstructure-Failure mode

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Late Pliocene diversity and distribution of Drynaria(Polypodiaceae) in western Yunnan explained by forest vegetation and humid climates

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Plant Diversity 2016年第4期38卷 194-200页

作者： yong-jiang huang Tao Su Zhe-Kun Zhou Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of Sciences Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of Sciences

The palaeodiversity of flowering plants in Yunnan has been extensively interpreted from both a molecular and fossil perspective. However, for cryptogamic plants such as ferns, the palaeodiversity remains poorly known. In this study, we describe a new ferny fossil taxon, Drynaria lanpingensis sp. nov. huang,Su et Zhou(Polypodiaceae), from the late Pliocene of northwestern Yunnan based on fragmentary frond and pinna with in situ spores. The frond is pinnatifid and the pinnae are entirely margined. The sori are arranged in one row on each side of the primary vein. The spores have a semicircular to bean-shaped equatorial view and a tuberculate surface. Taken together with previously described fossils, there are now representatives of three known fossil taxa of Drynaria from the late Pliocene of western *** finds suggest that Drynaria diversity was considerable in the region at that time. As Drynaria is a shade-tolerant plant, growing preferably in wet conditions in the understory of forests, its extensive existence may indicate forest vegetation and humid climates in western Yunnan during the late *** is in line with results from floristic investigations and palaeoclimatic reconstructions based on fossil floras.

关键词： Biodiversity Fern Drynaria In sire spore Late Pliocene Yunnan

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New fossil seeds of Eurya （Theaceae） from East Asia and their paleobiogeographic implications

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Plant Diversity 2016年第3期38卷 125-132页

作者： Hai Zhu yong-jiang huang Tao Su Zhe-Kun Zhou Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of Botany Chinese Academy of Sciences Kunming 650201 China Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical Garden Chinese Academy ofSdences Mengla 666303 China University of Chinese Academy of Sdences Beijing 100049 China State Key Laboratory of Paleobiology and Stratigraphy Nanjing Institute of Geology and Paleontology Chinese Academy of Sciences Nanjing 210008 China

Eurya has an excellent fossil record in Europe, but it has only a few fossil occurrences in East Asia though this vast area houses the highest modern diversity of the genus. In this study, three-dimensionally preserved fossil seeds of Eurya stigrnosa （Ludwig） Mai from the late Pliocene of northwestern Yunnan, southwestern China are described. The seeds are compressed and flattened, slightly campylotropous, and nearly circular to slightly angular in shape. The surface of the seeds is sculptured by a distinctive foveolate pattern, consisting of funnel-shaped and finely pitted cells. Each seed valve contains a reniform or horseshoe-shaped embryo cavity, a characteristic condyle structure and an internal raphe. These fossil seeds represent one of the few fossil records of Eurya in East Asia. This new finding therefore largely extends the distributional ranges of Eurya during Neogene. Fossil records summarized here show that Eurya persisted in Europe until the early Pleistocene, but disappeared thereafter. The genus might have first appeared in East Asia no later than the late Oligocene, and dispersed widely in regions such as Japan, Nepal, and southwestern China.

关键词： Seed fossil Eurya Late Pliocene Nanbanbang Northwest Yunnan China

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Crystallization of a Ti-based Bulk Metallic Glass Induced by Electropulsing Treatment

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Journal of Iron and Steel Research International 2016年第1期23卷 69-73页

作者： yong-jiang huang Xiang CHENG Hong-bo FAN Shi-song GUAN Zhi-liang NING Jian-fei SUN National Key Laboratory of Precision Hot Processing of Metals Harbin Institute of Technology School of Materials Science and Engineering Harbin Institute of Technology

The effect of electropulsing treatment（EPT）on the microstructure of a Ti-based bulk metallic glass（BMG）has been *** maximum current density applied during EPT can exert a crucial role on tuning the microstructure of the *** 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 *** 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.

关键词： bulk metallic glass electropulsing transmission electron microscopy crystallization microstructure

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Plasticityimprovement of a Zr-based bulk metallic glass by micro-arc oxidation

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Journal of Iron and Steel Research International 2017年第4期24卷 416-420页

作者： yong-jiang huang Peng Xue Xiang Cheng Ya-ming Wang Fu-yang Cao Zhi-liang Ning Jian-fei Sun State Key I.aboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001HeilongjiangChina School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Key Laboratory of Micro-systems and Micro structures Manufacturing(Harbin Institute of Technology) Ministry of EducationHarbin 150001HeilongjiangChina Institute for Advanced Ceramics Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

Mciro-arc oxidation（MAO）was used to coat porous films on the surface of a Zr-based bulk metallic glass *** compressive test results indicated that,compared with the as-cast sample,the MAO treated one exhibited higher deformation capacity,associated with multiple shear bands with higher density on the side surface and well-developed vein patterns with smaller size on the fractured *** pore in the MAOed film and the matrix/coating interface initiated the shear bands and impeded the rapid propagation of shear bands,thus favoring the enhanced plasticity of the MAO treated *** obtained results demonstrated that MAO can be considered as an effective method to finely tune the mechanical performance of monolithic bulk metallic glasses.

关键词： Bulk metallic glass Micro-arc oxidation Plasticity Surface modification Shear band

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Effect of Double Oxide Film Defects on Mechanical Properties of As-Cast C95800 Alloy

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Acta Metallurgica Sinica(English Letters) 2017年第6期30卷 541-549页

作者： Xin-Yi Zhao Zhi-Liang Ning Fu-Yang Cao Shan-Guang Liu yong-jiang huang Jing-Shun Liu Jian-Fei Sun School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Inner Mongolia University of TechnologyHohhot 010051China

The morphology of double oxide film defects and their influence on the tensile mechanical properties of a commercial Cu-Al （C95800） alloy were investigated in this study. Plane castings were produced with two types of pouting systems, and their tensile properties were measured and then analyzed by means of Weibull statistics method. The fracture surfaces of the tensile specimens were examined using scanning electron microscopy equipped with energy-dispersive spectroscopy. A large amount of double oxide film defects were observed on the tensile fractured specimens of the topfilled plane castings, and their chemical composition is identified to be Al2O3. Weibull statistics analyses showed that the double oxide film defects significantly reduce mechanical properties of the castings investigated. Furthermore, the ultimate tensile strength is more obviously deteriorated by double oxide film defects than elongation.

关键词： Double oxide film defects C95800 alloy Running system Weibull statistics analysis

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Fossil fruits of Firmiana and Tilia from the middle Miocene of South Korea and the efficacy of the Bering land bridge for the migration of mesothermal plants

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Plant Diversity 2021年第6期43卷 480-491页

作者： Lin-Bo Jia Gi-Soo Nam Tao Su Gregory W.Stull Shu-Feng Li yong-jiang huang Zhe-Kun Zhou CAS Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650204China Gongju National University of Education 27Ungjin-roGongju-siChungcheongnam-do 32553South Korea CAS Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303China University of the Chinese Academy of Sciences Beijing 100049China Germplasm Bank of Wild Species Kunming Institute of BotanyChinese Academy of SciencesKunmingYunnan 650201China Department of Botany Smithsonian InstitutionWashingtonDC 20013USA

Determining whether the high-latitude Bering land bridge(BLB)was ecologically suitable for the migration of mesothermal plants is significant for Holarctic phytogeographic *** studies provide a critical source of data on the latitudinal positions of different plant lineages at different times,permitting assessment of the efficacy of the BLB for *** we report exceptionally preserved fossils of Firmiana and Tilia endochrysea from the middle Miocene of South *** represents a new reliable record of Firmiana and the first discovery of the *** lineage in the fossil record of *** occurrence of these fossils in South Korea indicates that the two lineages had a distribution that extended much farther north during the middle Miocene,but they were still geographically remote from the *** light of the broader fossil record of Asia,our study shows that,in the middle Miocene,some mesothermal plants apparently inhabited the territory adjacent to the BLB and thus they were possibly capable of utilizing the BLB as a migratory *** other mesothermal plants,such as Firmiana and the *** lineages,however,are restricted to more southern regions relative to the BLB based on current fossil *** lineages may have been ecologically unable to traverse the BLB,which raises questions about the efficacy of the BLB as a universal exchange route for mesothermal plants between Asia and North America during the middle Miocene.

关键词： Asia Bering land bridge Biogeography Middle Miocene Malvaceae

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