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Effect of processing parameters on the microstructure and mechanical properties of TiAl/Ti_(2)AlNb laminated composites

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Journal of Materials Science & Technology 2022年第14期109卷 228-244页

作者： Donghai Li Binbin Wang Liangshun Luo Xuewen Li Yanjin Xu BinQiang Li Diween Hawezy Liang Wang Yanqing Su Jingjie Guo Hengzhi Fu National Key Laboratory for Precision Hot processing of Metals School of Materials Science&EngineeringHarbin Institute of TechnologyHarbin 150001China Key Laboratory for Lightweight Materials Nanjing Tech UniversityNanjing 211816China AVIC Manufacturing Technology Institute Beijing 100024China Materials Research Centre College of EngineeringSwansea UniversityBay CampusSwansea SA18ENUK

In order to improve the intrinsic brittleness of TiAl alloys,Ti_(2)AlNb alloys with outstanding ductility and toughness at room temperature,and good high-temperature performance are competitive candidates in constructing the TiAl-based laminated composites.In this work,TiAl/Ti_(2)AlNb laminated composites are successfully synthesized by vacuum hot pressing combined with the foil-foil(sheet)metallurgy.Under the pressure of 65 MPa,different holding time and temperature of hot pressing are tried and the optimized fabrication parameter is acquired as 1050℃/120 min/65 MPa.Along with the changes of processing parameters,the defect,microstructure,interface,phase transformation and the corresponding mechanical properties are detailly discussed.The results show that the TiAl/Ti_(2)AlNb laminated composite fabricated at 1050℃ for 2 h achieves a good metallurgical interface bonding.The corresponding interface microstructure is composed of region I and region II.The region I consists of O,α_(2)and B2/βphase,and region II is made up ofα2.Subsequently,the tensile tests indicate that the composite synthesized at 1050℃ for 2 h possesses a maximum strength of 812 MPa and a total elongation of 1.31%at room temperature,and a strength of 539.71 MPa and the highest total elongation of 10.34%at 750℃.The well synergistic deformation ability between the interface and the two base alloys endows the composite an excellent tensile performance.Moreover,the composite processed at 1050℃ for 2 h behaves the best fracture toughness in both arrester orientation and divider orientation with the value of 32.6 MPa.m^(1/2)and 30.1 MPa.m^(1/2),respectively.The Ti_(2)AlNb alloy in the laminated structure effectively release the stress around the crack tip and plays a role in toughening.Further,crack deflection,crack bridging,crack blunting and fragmentation also make contributions to enhance the fracture toughness of the laminated composites.

关键词： TiAl/Ti_(2)AlNb laminated composite Hot pressing processing parameters Microstructure Mechanical properties Fracture

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Effect of hot isostatic pressing processing parameters on microstructure and properties of Ti60 high temperature titanium alloy

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China Foundry 2023年第1期20卷 49-56页

作者： Tian-yu Liu Kun Shi Jun Zhao Shi-bing Liu You-wei Zhang Hong-yu Liu Tian-yi Liu Xiao-ming Chen Xin-min Mei Shenyang Research Institute of Foundry Co. Ltd.Shenyang 110022China State Key Laboratory of Light Alloy Casting Technology for High-end Equipment Shenyang 110022China

Hot isostatic pressing parameters are critical to Ti60 high temperature titanium alloy castings which have wide application perspective in aerospace.In order to obtain optimal processing parameters,the effects of hot isostatic pressing parameters on defects,composition uniformity,microstructure and mechanical properties of Ti60 cast high temperature titanium alloy were investigated in detail.Results show that increasing temperature and pressure of hot isostatic pressing can reduce defects,especially,the internal defects are substantially eliminated when the temperature exceeds 920℃or the pressure exceeds 125 MPa.The higher temperature and pressure can improve the microstructure uniformity.Besides,the higher pressure can promote the composition uniformity.With the temperature increases from 880℃to 960℃,α-laths are coarsened.But with increasing pressure,the grain size of prior-βphase,the widths ofα-laths andα-colony are reduced.The tensile strength of Ti60 alloy is 949 MPa,yield strength is 827 MPa,and the elongation is 11%when the hot isostatic pressing parameters are 960℃/125 MPa/2 h,which exhibits the best match between the strength and plasticity.

关键词： hot isostatic pressing processing parameters Ti60 titanium alloy defects composition uniformity microstructure mechanical properties

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Influence of processing parameters and heat treatment on phase composition and microstructure of plasma sprayed hydroxyapatite coatings

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Transactions of Nonferrous Metals Society of China 2009年第S2期19卷 463-469页

作者：赵国亮温广武吴昆 School of Materials Science and Engineering Harbin Institute of Technology(Weihai)Weihai 264209China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

Air plasma spraying process was employed to fabricate various hydroxyapatite(HA)coatings on titanium substrates.The influence of processing parameters on the phase composition and the microstructure of the obtained coatings was investigated.The effect of heat treatment on as-sprayed coating in terms of the crystallinity and microstructure was also studied.The phase composition of coatings was analyzed by X-ray diffraction(XRD)and FTIR.The surface and cross-section morphologies and microstructure of coatings as well as the morphology of feedstock were evaluated using scanning electron microscope(SEM).The crystallization temperature of amorphous HA phase in as-sprayed coating was examined by using differential thermal analysis(DTA). The results suggest that phase composition and microstructure of as-sprayed HA coatings strongly depend on the spraying parameters,and heat treatment at 760 ℃for 2 h is one of effective means for increasing the crystallinity and improvement in microstructure of as-sprayed HA coatings.

关键词： hydroxyapatite coatings plasma spraying processing parameters heat treatment

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Effect of alloying elements and processing parameters on the Portevin–Le Chatelier effect of Al–Mg alloys

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International Journal of Minerals,Metallurgy and Materials 2015年第2期22卷 175-183页

作者： Peng-cheng Ma Di Zhang Lin-zhong Zhuang Ji-shan Zhang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

The effects of alloying elements and processing parameters on the mechanical properties and Portevin-Le Chatelier effect of A1-Mg alloys developed for inner auto body sheets were investigated in detail. Tensile testing was performed in various Zn and Mg contents under different annealing and cold-rolling conditions. In the results, the stress drop and reloading time of serrations increase with increasing plastic strain and exhibit a common linear relationship. The increase rates of stress drop and reloading time increase with increasing Mg or Zn content. The alloys with a greater intensity of serrated yielding generally exhibit a greater elongation. The stress drop and reloading time of serrations decrease with increasing grain size in the case of the annealed samples. The cold-rolled sample exhibits the most severe serra- tion because it initially contains a large number of grain boundaries and dislocations.

关键词： aluminum-magnesium alloys Portevin-Le Chatelier effect alloying elements processing parameters mechanical properties

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Optimization of processing parameters for preparation of Al-3Ti-1B grain refiner

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Transactions of Nonferrous Metals Society of China 2009年第S2期19卷 387-391页

作者：李豹王宏伟赵瑞峰魏尊杰 School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Beijng Xinghang Mechanical Electrical Equipment Factory Beijing 100074China

Al-3Ti-1B master alloys were prepared at different processing parameters by the reaction of halide salts,and the grain refining response of Al-7Si alloy was investigated with Al-3Ti-B master alloy.The microstructure of master alloy and its grain refining effect on Al-7Si alloy were investigated by means of OM,XRD and SEM.Experimental results show that,the size of Al3Ti particles presented in Al-3Ti-1B master alloys increases with the increase of reaction temperature and decreases with the increase of cooling rate.The grain refining efficiency of Al-3Ti-1B master alloy on Al-7Si alloy is mainly attributed to heterogeneous nucleation of Al3Ti particles,and the morphology ofα(Al)changes from coarse dendritic to fine equiaxed.As a result,Al-3Ti-1B master alloy is prepared by permanent mold,and holding at 800 ℃for 30min,which has better grain refining performance on Al-7Si alloy.

关键词： Al-3Ti-1B master alloy processing parameters grain refinement Al-7Si alloy

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Optimization of processing parameters for Laser Powder Deposition using Finite Element Method

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Journal of Wuhan University of Technology(Materials Science) 2010年第5期25卷 832-837页

作者：付垚 State Key Laboratory of Non-ferrous Metals and Processes General Research Institute for Non-ferrous Metals

In order to investigate the effects of powder materials and processing parameters on thermal and stress field during laser powder deposition （LPD）, a finite element model was developed with the help of ANSYS software. The finite element model was verified by the comparison between the experimental results and computed results. Then LPD processes with different powder materials and processing parameters were simulated by using the FE model. The results show that less difference of thermal conductivity and thermal expansion coefficient between powder material and substrate material produces lower residual stress; higher laser power, laser scanning speed and smaller laser beam diameter can lead higher peak temperature and higher residual stress. The research opens up a way to rational selection of the powder materials and processing parameters for ensured quality.

关键词： laser powder deposition thermal field stress field powder material processing parameters

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Influence of processing parameters on the phase composition of ZrN-Si_3N_4 synthesized from zircon

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Rare Metals 2009年第4期28卷 367-371页

作者： MA Beiyue YU Jingkun School of Materials and Metallurgy Northeastern University Shenyang 110004 China

The optimum parameters were determined for synthesizing ZrN-Si3N4 composite powder from zircon by carbothermal reduction-nitridation （CTRN） process. The samples were prepared by mixing the carbon black of an average particle size less than 30 μm and the zircon of 40 μm with C/ZrSiO4 mass ratios of 0.2, 0.3, 0.4, and 0.5. The prepared samples were subjected to the CTRN process at temperatures of 1673, 1723, 1753, and 1773 K for 6, 9, and 12 h. The CTRN process was conducted in an atmosphere-controlled tubular furnace in a nitrogen gas flow of 1.0 L/rain. All the products were examined by X-ray powder diffraction to determine the transformation. The results showed that the proper transformation of ZrN-Si3N4 occurred at 1773 K for 12 h with a C/ZrSiO4 mass ratio of 0.4.

关键词： inorganic non-metal materials nitrides carbothermal reduction-nitridation zircon processing parameters phase composition

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Effects of Various processing parameters on Mechanical Properties and Biocompatibility of Fe-based Bulk Metallic Glass Processed via Selective Laser Melting at Constant Energy Density

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2022年第3期1卷 49-57页

作者： Niyou Wang Shuai Chang Guiwei Li S Thameem Dheen A Senthil Kumar Wenzheng Wu Qingping Liu Ji Zhao Luquan Ren Jerry Ying Hsi Fuh Department of Mechanical Engineering National University of SingaporeSingapore117575Singapore Department of Materials Science and Engineering National University of SingaporeSingapore117576Singapore State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China School of Mechanical and Aerospace Engineering Jilin UniversityChangchun130025China Key Laboratory of Bionic Engineering Ministry of Education Jilin UniversityChangchun130025China Department of Anatomy National University of SingaporeSingapore117594Singapore

The unique properties of bulk metallic glass(BMG)render it an excellent material for bone-implant applications.BMG samples are difficult to produce directly because of the critical cooling rate of molding.Advancements in additive manufacturing technologies,such as selective laser melting(SLM),have enabled the development of BMG.The successful production of materials via SLM relies significantly on the processing parameters;meanwhile,the overall energy density affects the crystallization and,thus,the final properties.Therefore,to further determine the effects of the processing parameters,SLM is performed in this study to print Fe-based BMG with different properties three dimensionally using selected processing parameters but a constant energy density.The printed amorphous Fe-based BMG outperforms the typical 316 L stainless steel(316 L SS)in terms of mechanical properties and corrosion resistance.Moreover,observations from nanoindentation tests indicate that the hardness and elastic modulus of the Fe-based BMG can be customized explicitly by adjusting the SLM processing parameters.Indirect cytotoxicity results show that the Fe-based BMG can enhance the viability of SAOS2 cells,as compared with 316 L SS.These intriguing results show that Fe-based BMG should be investigated further for orthopedic implant applications.

关键词： Bulk metallic glass Selective laser melting processing parameters Energy density Part characterization Biocompatibility

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Effects of processing parameters on figuration during the GMAW rapid prototyping process

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China Welding 2006年第4期15卷 30-33页

作者：尹玉环胡绳荪张晓博何滨华 Tianjin University Tianjin 300072. Hebei University of Technology Tianjin 300130.

As a deposition technology, gas metal arc welding （GMAW） has shown new promise for rapid prototyping of metallic parts. During the process of metal forming using the arc of GMA W, low heat input and stable droplet transition are critical to high quality figuration. The effects of various processing parameters on figuration quality were studied in the experiment of GMA W rapid prototyping using the wire of ERSO-6 , including welding voltage, wire feeding rate, welding speed and so on. The optimal parameters for ERSO-6 are obtained. Simultaneously, it is verified that the rapid prototyping parts with favorable structures and quality can be achieved under the conditions of low heat input and stable droplet transition.

关键词： rapid prototyping gas metal arc welding processing parameters figuration

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Effects of Solid-State Reaction Synthesis processing parameters on Thermoelectric Properties of Mg_2Si

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Journal of Wuhan University of Technology(Materials Science) 2004年第2期19卷 55-56页

作者：姜洪义 Wuhan University of Technology

The Mg_(2)Si-matrix thermoelectric material was synthesized by low temperature solid-state reaction.This paper studies the effects of holding time and reaction temperature on the particle size and the properties of the material,and also studies effects of doping elemental Sb,Te and their doping seqence on the properties of the material.The result shows that excessively high temperature and elongated holding time of solid-state reaction are harmful,there is a range of particle size to ensure optimum properties and the doping sequence of Sb or Te without influencing the properties.

关键词： solid-state reaction processing parameters Mg_2Si based compounds

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