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Recent Progress in Metallurgical Bonding Mechanisms at the Liquid/Solid Interface of Dissimilar Metals Investigated via in situ X-ray Imaging Technologies

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Acta Metallurgica Sinica(English Letters) 2021年第2期34卷 145-168页

作者： Zongye Ding Naifang Zhang Liao Yu wenquan lu Jianguo Li Qiaodan Hu Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The liquid/solid(L/S)interface of dissimilar metals is critical to the microstructure,mechanical strength,and structural integrity of interconnects in many important applications such as electronics,automotive,aeronautics,and astronautics,and therefore has drawn increasing research *** design preferential microstructure and optimize mechanical properties of the interconnects,it is crucial to understand the formation and growth mechanisms of diversified structures at the L/S interface during *** situ synchrotron radiation or tube-generated X-ray radiography and tomography technologies make it possible to observe the evolution of the L/S interface directly and therefore have greatly propelled the research in this ***,we review the recent progress in understanding the L/S interface behaviors using advanced in situ X-ray imaging techniques with a particular focus on the following two issues:(1)interface behaviors in the solder joints for microelectronic packaging including the intermetallic compounds(IMCs)during refl ow,Sn dendrites,and IMCs during solidification and refl ow porosities and(2)growth characteristics and morphological transition of IMCs in the interconnect of dissimilar metals at high ***,the main achievements and future research perspectives in terms of metallurgical bonding mechanisms under complex conditions with improved X-ray sources and detectors are remarked and discussed.

关键词： Liquid/solid interface Metallurgical bonding Dissimilar interconnects In situ X-ray imaging Solidification Microelectronic packaging

3D morphological evolution and growth mechanism of proeutectic FeAl_(3) phases formed at Al/Fe interface under different cooling rates

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Journal of Materials Science & Technology 2022年第21期116卷 83-93页

作者： Naifang Zhang Qiaodan Hu Zongye Ding wenquan lu Fan Yang Jianguo Li Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong University200240 ShanghaiChina School of Mechanical Engineering Shanghai Jiao Tong University200240 ShanghaiChina

The 3D morphologies and growth mechanisms of proeutectic FeAl_(3) at the Al/Fe interface under different cooling rates were studied by synchrotron X-ray *** increasing cooling rate,FeAl_(3) crystals developed from faceted polygonal prism,plates with flat surface,thin ribbon-like with periodic undulating surface to non-faceted rods with radial dendrites in cross section,indicating a gradual interface growth mode transition from two-dimensional layer growth to continuous *** a higher cooling rate,twinning mechanism plays a leading role in the formation and growth of FeAl_(3).A link between the morphologies,twinning and crystallographic structure was established based on quantitative analyses on the 3D structures.

关键词： Solidification 3D morphology FeAl_(3)Internetallic compounds Cooling rate Synchrotron radiation Al/Fe interface

Effect of Post-weld Heat Treatment on the Microstructure and Mechanical Properties of 2.25Cr-1Mo-0.25V Ultra-Thick Steel Plate

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Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 1104-1114页

作者： Yanyang Wu Zongye Ding wenquan lu Jingchao Hou Qiaodan Hu Jianguo Li Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai200444China School of Mechatronic Engineering and Automation Foshan UniversityFoshan528225GuangdongChina WuYang Iron and Steel Wugang450000HenanChina

Ensuring the homogeneous and excellent mechanical properties of 2.25Cr-1Mo-0.25V ultra-thick steel plate is the key to the production of hydrogenation reactor ***,it is required to understand the heterogeneity of microstructures and properties of ultra-thick plate after heat *** this work,the effect of post-weld heat treatment(PWHT)on the strength,plasticity,toughness and microstructures of the 193-mm-thick steel plate was investigated,and the formation mechanism of heterogeneity was *** PWHT decreased the room-and high-temperature yield strength(YS)and ultimate tensile strength(UTS)of the steel plate after normalizing and tempering(NT),while the room-and high-temperature YS and UTS decreased from the surface to the center of 193-mm-thick steel *** was attributed to the enhanced decomposition of martensite-austenite(M-A)constituents and coarsening of grains and precipitated carbides.

关键词： Cr-Mo steel Ultra-thick steel plate Microstructure Mechanical properties Heterogeneity

Atomic scale structural analysis of liquid immiscibility in binary silicate melt:A case of SiO2–TiO2 system

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Journal of Materials Science & Technology 2020年第18期52卷 53-60页

作者： Cuiyu Zhang Xuan Ge Qiaodan Hu Fan Yang Pingsheng Lai Caijuan Shi wenquan lu Jianguo Li Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and Engineering.Shanghai Jiao Tong UniversityShanghai 200240China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai UniversityShanghai 200444China

Thermodynamic/dynamic modeling of liquid immiscibility in silicates is seriously hindered due to lack of in situ investigation on the structural evolution of the *** this work,atomic-scale structural evolution of a classic binary silicate immiscible system,SiO2–TiO2,is tracked by in situ high energy X-ray diffraction(HE-XRD).It is found that both the configuration of[SiO]and the polymerization between them are closely coupled with embedment and extraction of the metallic cations(Ti^4+).[SiO]monomer goes through deficit-oxygen and excess-polymerization before liquid–liquid separation and enables self-healing after liquid–liquid separation,which challenges the traditional cognition that[SiO4]monomer is ***4+cations with tetrahedral oxygen-coordination first participate in the network construction before liquid *** four-fold Ti–O bond is broken during liquid separation,which may facilitate the movement of Ti4+across the Si–O network to form TiO2-rich *** structural features of nodules were also investigated and they were found highly analogous to that of molten TiO2,which implies a parallel crystallization behavior in the two *** results shed light on the structural evolution scenario in liquid immiscibility at atomic scale,which will contribute to constructing a complete thermodynamic/dynamic framework describing the silicate liquid immiscibility systems beyond current models.

关键词： Liquid immiscibility Atomic scale structure Synchrotron radiation In-situ HE-XRD SiO2-TiO2 melt

Analysis of the HNF4A isoform-regulated transcriptome identifies CCL15 as a downstream target in gastric carcinogenesis

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Cancer Biology & Medicine 2021年第2期18卷 530-546页

作者： Zhen Ni wenquan lu Qi Li Chuan Han Ting Yuan Nina Sun Yongquan Shi State Key Laboratory of Cancer Biology&Institute of Digestive Diseases Xijing HospitalAir Force Medical University of PLAXi’an 710032China Department of Gastroenterology General Hospital of Western Theater CommandChengdu 610083China Department of Gastroenterology First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052China Department of Endocrinology General Hospital of Western Theater CommandChengdu 610083China Department of Gastroenterology 989 Hospital of the People’s Liberation ArmyLuoyang 471003China Department of Gastroenterology First Affiliated Hospital of Xi’an Medical CollegeXi’an 710038China

Objective:Hepatocyte nuclear factor 4α(HNF4 A)has been demonstrated to be an oncogene in gastric cancer(GC).However,the roles of different HNF4 A isoforms derived from the 2 different promoters(P1 and P2)and the underlying mechanisms remain ***:The expression and prognostic values of P1-and P2-HNF4 A were evaluated in The Cancer Genome Atlas(TCGA)databases and GC ***,functional assays of P1-and P2-HNF4 A were conducted both in vivo and in ***-throughput RNA-seq was employed to profile downstream pathways in P1-and P2-HNF4 A-overexpressing GC *** expression and gene regulation network of the candidate target genes identified by RNA-seq were characterized based on data mining and functional ***:HNF4 A amplification was a key characteristic of GC in TCGA databases,especially for the intestinal type and early ***,P1-HNF4 A expression was significantly higher in tumor tissues than in adjacent non-tumor tissues(P0.05).High P1-HNF4 A expression indicated poor prognoses in GC patients(P<0.01).Furthermore,P1-HNF4 A overexpression significantly promoted SGC7901 and BGC823 cell proliferation,invasion and migration in vitro(P<0.01).Murine xenograft experiments showed that P1-HNF4 A overexpression promoted tumor growth(P<0.05).Mechanistically,RNA-seq showed that the cytokine-cytokine receptor interactions pathway was mostly enriched in P1-HNF4 A-overexpressing GC ***,chemokine(C-C motif)ligand 15 was identified as a direct target of P1-HNF4 A in GC ***:P1-HNF4 A was the main oncogene during GC *** cytokine-cytokine receptor interaction pathway played a pivotal role and may be a promising therapeutic target.

关键词： Gastric cancer carcinogenesis HNF4A CCL15 transcriptomics

Effect of cooling rate on the 3D morphology of the proeutectic Al3Ni intermetallic compound formed at the Al/Ni interface after solidification

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Journal of Materials Science & Technology 2021年第10期69卷 60-68页

作者： Liao Yu Qiaodan Hu Zongye Ding Fan Yang wenquan lu Naifang Zhang Sheng Cao Jianguo Li Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Materials The University of ManchesterOxford RoadManchesterMl 39PLUK

Effect of cooling rate on the 3 D morphology and the growth mechanism of the proeutectic Al3Ni intermetallic compound(IMC) that forms at the Al/Ni interface after solidification was investigated by synchrotron X-ray microtomography in combination with EBSD analysis. The proeutectic Al3Ni phase that forms under an average cooling rate of 0.1 Ks^(-1) shows a characteristic faceted growth behavior and presents a typical 3 D morphology as partially hollow quadrangular prisms. On the contrary, that forms under an average cooling rate of 10 Ks^(-1) shows complicated dendritic morphology with asymmetrically distributed arms and faceted V-shape groove at the distal end, indicating a gradual transition of the growth behavior from non-faceted to faceted during the solidification process. These results reveal that the morphology of the proeutectic Al3Ni is highly sensitive to the solidification condition so that fine control of the desired morphology may be achieved by carefully manipulating the cooling profile.

关键词： 3D morphology Al3Ni intermetallic compounds Solidification Cooling rate Synchrotron radiation Al/Ni interface

Ambiguous temperature difference in aerodynamic levitation process: Modelling, solving and application

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Journal of Materials Science & Technology 2019年第8期35卷 1636-1643页

作者： Xuan Ge Xiaowei Xu Qiaodan Hu wenquan lu Liang Yang Sheng Cao Mingxu Xia Jianguo Li School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Shanghai Key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong University Shanghai 200240 China Monash Centre for Additive Manufacturing (MCAM) Monash University Clayton VIC 3800 Australia

The aerodynamic levitation provides an efficient technique for the research on thermophysical properties and solidification behavior of refractory materials. However, there is a nonnegligible temperature differences across sample, causing unexpected uncertainty of measurement, such as, thermal expansivity and undercooling limit. We establish thermal filed model with properly simplified boundary condition, and derive quantitative expressions of this ambiguous temperature difference. Here we show that the temperature difference not only related to the average temperature, relative size and thermal conductivity of sample, but significantly influenced by the rotation pattern of sample. A huge temperature differences is almost inevitable when the sample with low thermal conductivity and high melting point is smelted in stationary suspension pattern, however, a drastically reduction of temperature difference can be fulfilled by simply making the sample rotation in up to down pattern. The thermal filed simulation was used to confirm the validity of these theoretical expressions. This work shed light on temperature difference in aerodynamic levitation. Based on this work, one can simply estimate the extent of temperature difference across the sample, and regulated that conveniently if needed, which benefit for novel material preparation and solidification mechanism study based on this technique.

关键词： Solidification Levitation Modelling Temperature difference

Intergrowth mechanism and morphology prediction of faceted Al_(3)Ni formed during solidification by a spatial geometric model

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Journal of Materials Science & Technology 2020年第19期54卷 40-47页

作者： Zongye Ding Qiaodan Hu wenquan lu Fan Yang Yihan Zhou Naifang Zhang Sheng Cao Liao Yu Jianguo Li Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai200444China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Materials University of ManchesterOxford RoadManchester M139PLUK

The interplay and intergrowth characteristic of faceted intermetallic compounds(IMCs)during solidification was originally investigated through the rod-like Al3 Ni crystals in the liquid Al/solid Ni interconnection by using synchrotron radiography,and the diversified 3-D morphologies were reconstructed by synchrotron tomography.A spatial geometric model was established to effectively predict the diversified growth patterns of two spatial *** the two overlapping Al3 Ni crystals,the impeded crystal growth was divided into three different stages,decided by the hindrance form the other ***,the groove formed on the crystal surface is directly related to the solute redistribution under the critical condition of boundary layer thickness larger than two crystals *** closer distance and smaller crystal size indicate the deeper and larger groove,and the morphology changes from hemispheroid to hemi-ellipsoid with the increased opposite and interacted faces.

关键词： Solidification Synchrotron radiography Intergrowth behaviour Intermetallic compounds 3-D morphology

Deciphering the glass-forming ability of Al_(2)O_(3)-Y_(2)O_(3)system from temperature susceptibility of melt structure

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Journal of Materials Science & Technology 2024年第18期185卷 48-57页

作者： Pingsheng Lai Xuan Ge Caijuan Shi Jianqiang Li Fan Yang wenquan lu Jianguo Li Qiaodan Hu Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Chemistry and Bioscience Aalborg UniversityAalborg 9220Denmark Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Despite its significance in both fundamental science and industrial applications,the glass-forming transition in the Al_(2)O_(3)-Y_(2)O_(3)(AY)refractory system is not yet fully understood due to the elusive structure evolution upon ***,atomic-scale structural changes in AY-bearing melts with different compositions and temperatures are tracked by employing in situ high-energy synchrotron X-ray diffraction and empirical potential structure refinement *** find that the glass-forming abilities(GFA)of AY-bearing melts are intriguingly correlated with the dependence of melt structure on *** the case of the Al_(2)O_(3)and Y_(3)A_(l5)O_(12)(YAG),the observed large structural changes from superheating to under-cooling melt(i.e.,higher temperature susceptibility)correspond to a low ***,the 74Al_(2)O_(3)-26Y_(2)O_(3)(AY26)melt,with the smallest temperature susceptibility,exhibits the highest *** models illustrate that the temperature susceptibility of melt is associated with its atomic arrangement,especially the stability of cation-cation pairs.A balanced network(in AY26 melt),where the unsteady OAl3 tri-clusters are minimized and steady apex-to-apex connections between adjacent network units are abundant,contributes to stabilizing cationic ***,in turn,fosters the formation of largesized Al-O-Al rings,which topologically facilitates the subsequent glass-forming *** findings provide new structural insight into the GFA of AY-bearing melts and may expand to other unconventional glass-forming systems to accelerate glassy materials design.

关键词： Glass-forming ability Al_(2)O_(3)-Y_(2)O_(3)glasses Melt structure High-energy synchrotron X-ray diffraction Aerodynamic levitation EPSR simulation