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3d morphology and formation mechanism of fractures developed by true triaxial stress

International Journal of Mining Science and Technology 2022年第6期32卷 1273-1284页

作者： Bing Chen Baotang Shen Shichuan Zhang Yangyang Li Haiyang Jiang State Key Laboratory of Mining disaster Prevention and Control Co-founded Shandong University of Science and TechnologyQingdao 266590China CSIRO Mineral Resources Queensland 4069Australia No.1 Institute of Geology and Mineral Resource Exploration of Shandong Province Jinan 250010China College of New Energy and Environment Jilin UniversityChangchun 130012China

As main part of underground rock mass,the three-dimensional(3d)morphology of natural fractures plays an important role in rock mass *** on previous studies on 3d morphology,this study probes into the law and mechanism regarding the influence of the confining pressure constraints on 3d morphological features of natural ***,fracture surfaces were obtained by true triaxial compression test and 3d laser *** 3d morphological parameters of fractures were calculated by using Grasselli’s *** results show that the failure mode of granites developed by true triaxial stress can be categorized into tension failure and shear *** on the spatial position of fractures,they can be divided into tension fracture surface,S-1 shear fracture surface,and S-2 shear fracture ***-failure of the tension fracture surface is dominated by mainly intergranular fracture;the maximum height of asperities on the fracture surface and the 3d roughness of fracture surfaces are influenced by σ_(3) only and they are greater than those of shear fracture surfaces,a lower overall uniformity than tension fracture surface.S-1 shear fracture surface and S-2 shear fracture surface are dominated by intragranular and intergranular coupling *** maximum height of asperities on the fracture surface and 3d roughness of fracture surface are affected by σ_(1),σ_(2),and σ_(3).With the increase of σ_(2) or σ_(3),the cutting off of asperities on the fracture surface becomes more common,the maximum height of asperities and 3d roughness of fracture surface further decrease,and the overall uniformity gets further *** experimental results are favorable for selecting technical parameters of enhanced geothermal development and the safety of underground mine engineering.

关键词： True triaxial stress Failure mode Fracture angle 3d morphology Micro-fracture

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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

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3d Fe-Rich Phases Evolution and Its Effects on the Fracture Behavior of Al-7.0Si-1.2Fe Alloys by Mn Neutralization

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Acta Metallurgica Sinica(English Letters) 2022年第1期35卷 163-175页

作者： dong-Fu Song Yu-Liang Zhao Zhi Wang Yi-Wang Jia dao-Xi Li Ya-Nan Fu da-Tong Zhang Wei-Wen Zhang National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of TechnologyGuangzhou510641China Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application Institute of New MaterialsGuangdong Academy of SciencesGuangzhou510650China School of Mechanical Engineering Dongguan University of TechnologyDongguan523808China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai201204China

The evolution of the 3d Fe-rich phases of Al-7.0Si-1.2Fe alloys with different Mn contents was visualized and characterized using synchrotron X-ray computed tomography,and the effect of Fe-rich phases with typical morphologies on the fracture behavior during tensile testing was *** results showed that the Fe-rich phase changed from platelet-likeβ-Al_(5) Fe Si intoα-Al_(15)(Fe Mn)_(3)Si_(2)with various morphologies after the addition of *** Mn addition not only significantly reduced the volume fraction,equivalent diameter and interconnectivity of the Fe-rich phase but also greatly increased the sphericity,surface thickness,and distribution of the mean curvature and surface ***,the equivalent diameter ofα-Al_(15)(FeMn)_(3)Si_(2)had an inverse exponential function relationship with its *** 3d morphology ofα-Al_(15)(FeMn)_(3)Si_(2)can be summarized as massive and regular polyhedrons,hollow and regular polyhedrons,and multibranched *** fraction of the different 3d morphologies in each alloy is related to the Mn content,where excess Mn increased the number and volume fraction of the large Fe-rich particles with a low *** ductility of each alloy was significantly improved by the addition of Mn but gradually decreased when the Mn/Fe ratio exceeded *** increase in largeα-Al_(15)(Mn Fe)_(3)Si_(2)with a low sphericity was the main reason for the decreased ductility of alloys with a high Mn content.

关键词： Synchrotron X-ray tomography Fe-rich phase 3d morphology Fracture behavior

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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

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Preparation and properties of low cost porous titanium by using rice husk as hold space

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Progress in Natural Science:Materials International 2017年第3期27卷 344-349页

作者： Xinsheng Wang Zhenlin Lu Lei Jia Feizhou Li School of Materials Science and Engineering Xi'an University of Technology department of Mechanical Baoji University of Arts and Sciences

The present study demonstrates an effective low cost effective process for the production of porous titanium with 50-60 vol% porosity using 20 wt% rice husk(RH) with the hold spaces in the size ranges of 100-180,180-250,250-380,and 380-550 μ*** analysis of the samples revealed an interconnected pore microstructure consisting of a mixture of coarse channel pores,created during burnout of *** compressive strength of the developed samples was in the range of 17-70 MPa and depended strongly on their porosity and pore *** amounts of cleavage steps appeared on the brittle fracture surface after compression of the *** 3d morphology of porous titanium surface with rice husk sizes of 100-180μm and 380-550μm can be characterized by the micro-hole surface of pore size,and the size of the hole diameter and *** developed porous titanium is considered potentially useful in future medical or industrial application of biomass.

关键词： Porous Titanium Rice husk Mechanical properties 3d morphology Biomass

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Influence of different high pressure die casting processes on 3d porosity distribution of Mg-3.0Nd-0.3Zn-0.6Zr alloy

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China Foundry 2021年第6期18卷 521-528页

作者： Yi-hu Ma Wen-bo Yu Yu-qi Zhou Shou-mei Xiong Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

3d reconstruction was adopted to characterize the microstructural morphologies of Mg-3.0Nd-0.3Zn-0.6Zr alloy castings produced by high pressure die casting(HPdC)processes with different parameters,including low slow-shot speed,solidification pressurization and fast slow-shot *** low slow-shot speeds of 0.1 m·s^(-1),0.2 m·s^(-1) and 0.3 m·s^(-1),the porosity is concentrated in the center of the castings with one spiral staggered shape along the liquid flow *** porosity volume simultaneously decreases with the reduction of quantity and size of externally solidified crystals(ESCs),while the shrinkage pores become more and more dispersed with the increasing low slow-shot *** not only reduces the porosity volume due to the improvement of feeding ability,but also transformes the center gathered porosity into one layer-by-layer distribution *** with the increasing fast slow-shot speed,the central porosity dramatically decreases and transforms into a large-scale spiral staggered shape along the liquid flow ***,the porosity is much more dispersed when the speed is increased from 2 m·s^(-1) to 3 m·s^(-1).

关键词： HPdC parameters porosity volume 3d morphology

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