检索结果-南通市图书馆

Journal of Materials Science & Technology 2010年第8期26卷 693-704页

作者： R.K.Gupta Bhanu Pant Vijaya Agarwala R.C.Agarwala P.P.Sinha Vikram Sarabhai Space Centre ISROTrivandrum-695 022India Indian Institute of Technology Roorkee

reaction synthesis process has been used to develop γ titanium aluminide using elemental powders. Powder mixture of Ti-48 at. pct AI was prepared in ball mill and reaction synthesis was carried out in hot press with varying temperature and pressure. Titanium aluminide synthesized under high pressure and temperature resulted in better properties with respect to densification, homogenization response, mechanical properties and oxidation resistance as compared to that synthesized under low pressure and temperature. AI rich phases were observed in as-synthesized condition in all the experiments. However, some Ti rich phases were also found in high pressure-temperature synthesized samples. Density, hardness and tensile strength have been correlated with applied pressure through empirical relations. Variation in density with pressure is found to be logarithmic whereas hardness and tensile strength variation with pressure is polynomial.

关键词： Titanium aluminide reaction synthesis Phase transformation

MICROSTRUCTURE AND PROPERTY OF Al/TiC COMPOSITES PREPARED BY reaction synthesis

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 1996年第1期6卷 114-119页

作者： Zhang Erlin Zeng Xiaochun Zeng Songyan Li Qingchun School of Material Science and Engineering Harbin Institute of TechnologyHarbin 150001

A novel in-situ process-reaction synthesis has been used to fabricate Al/TiC compos-ites,the phase constitute,microstructure and mechanical property of the Al/TiC composite have been investigated by the use of XRD and *** has been shown that the reaction synthesized TiC particu-late is submicron in size(about 0.1~0.8μpm),spherical in shape and smooth in *** macrostruc-ture the distribution of the TiC particulate in matrix is homogeneous,but in micostructure there is micro-segregation of the TiC particulate at the *** cast structure become fine because of the existence of the TiC *** addition«with the increasing of weight percentage of TiC partic-ulate in alloy,the yield strength and ultimate tensile strength of the composite increase significantly«*** 15%TiC,117% and 103% increase respectively,in the same time the elongation of the composite is still more than 4.5%.In the end,the analysis has been done by SEM on the fracture morphology of the *** results show that the fracture is ductility,and mainly because of the cluster of TiC particulate to intergrannular and the synthesis of bar morphology Al_(3)Ti.

关键词： composites microstructure mechanical property particulate reaction synthesis

Research on development of in situ titanium matrix composites and in situ reaction thermodynamics of the reaction systems

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2006年第6期13卷 551-557页

作者： Lifang Cai Yongzhong Zhang Likai Shi Haoqiang Yang Mingzhe Xi National Engineering Research Center for Nonferrous Metal Composites General Research Institute for Nonferrous Metals Beijing 100088 China

The in situ synthesis method for titanium matrix composites （TMCs） has obvious technical and economical advantages over other traditional methods. Ultrafine reinforcement particles were formed in situ by chemical reaction between elements or between elements and compounds. Using the approach, contamination at the composite matrix/reinforcement particle interface did not occur, interface bonding was good, and the reinforcement particle was thermodynamically stable. The stage of development of the preparation process for in situ TMCs as well as the thermodynamic analysis of the possible in situ reaction systems was described.

关键词： in situ titanium matrix composites reaction synthesis reaction system thermodynamic analysis

Microstructure Evolution and Pore Formation Mechanism of Porous TiAl3 Intermetallics via Reactive Sintering

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2018年第4期31卷 440-448页

作者： Xinyang Jiao Xiaohong Wang Peizhong Feng Yanan Liu Laiqi Zhang Farid Akhtar School of Materials Science and Engineering China University of Mining and TechnologyXuzhou 221116People's Republic of China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116People's Republic of China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083People's Republic of China Division of Materials Science Lulefi University of Technology97187 LulJtSweden

Porous TiAl3 intermetallics were fabricated through vacuum reactive sintering from Ti-75A1 at.% elemental powder *** phase compositions,expansion behaviors,pore characteristics and microstructure evolution of TiAl3 intermetallics were investigated,and the pore formation mechanism was also *** was found that the actual temperature of compacts showed an acute climb from 668 to 1244℃ in 166s,while the furnace temperature maintained the linear growth of 5℃/min,which indicated that an obvious thermal explosion（TE）reaction occurred during sintering,and only single-phase TiA13 intermetallic was synthesized in TE *** open porosity increased from 22.2（green compact）to 32.8% after reactive diffusion sintering at 600℃ and rised to 58.7% after TE,then decreased to 51.2% after high-temperature homogenization at 1100℃.Therefore,TE reaction is the dominated pore formation mechanism of porous TiAl3 *** pore evolution in porous TiAl3 intermetallics occurred by the following mechanisms：certain intergranular pores remained among powder particles of green compact,then low-temperature sintering resulted in a further increase in porosity due to the Kirkendall ***,TE reaction gave rise to a dramatic volume expansion because of the rapid increase in temperature,and high-temperature sintering caused densification and a slight shrinkage.

关键词： Intermetallics Porous materials Powder metallurgy reaction synthesis Thermal explosionsynthesis

Microstructure Evolution of in situ （Ti3AlC+Ti5Si3 ）/Ti3Al Composite Sheet with a Novel Quasi-continuous Chain Reinforcement Distribution Architecture Prepared by Using Roll Bonding and reaction Annealing

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2013年第12期29卷 1191-1196页

作者： J.C.Pang G.H.Fan X.P.Cui A.B.Li L.Geng Z.Z.Zheng Q.W.Wang School of Materials Science and Engineering Harbin Institute of Technology

The Ti3Al matrix composite sheet with a novel quasi-continuous chain reinforcement distribution was prepared by using roll bonding and subsequent reaction annealing with pure Ti and SiCp/Al *** (Ti3AlC t Ti5Si3) reinforcements were produced by in situ reaction of the as-rolled Tie(SiC p/Al) laminated composite sheet after a two-stage annealing treatment including first annealing at 660 C and second annealing at 1250 *** microstructure evolution during the reaction annealing was *** the first reaction annealing,TiAl3was formed,and the SiC particles were pushed together due to the Kirkendall effect,and after the second reaction annealing,Ti3Al,Ti3AlC and Ti5Si3were *** addition,the reinforcement distribution presents a quasi-continuous chain microstructure in Ti3Al matrix composite sheet.

关键词： Composite Intermetallic Fabrication reaction synthesis

As-cast microstructures of Ti-11Al-xC alloys

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2001年第2期8卷 191-195页

作者：王宏伟魏尊杰曾松岩 Sch. of Mat. Sci. Harbin Inst. of Technol. Harbin 150001 China

Presents the investigation of as cast microstructures of high temperature α+α 2 titanium alloys matrix composites reinforced by particles and fabricated using a reaction synthesis method by XRD, OM and SEM which reveals that the matrix transformed into single phase α 2 from two phases α+α 2 and reinforcing phases become Ti 3AlC and TiC from single phase TiC as C content increases to a critical value, and Ti 3AlC precipitates during solidification processing and points out that the morphologies of TiC and Ti 3AlC are of short lath shape and near spherical shape, respectively, and lattice parameters of matrix α 2 increase with the increasing of C content, but the lattice parameter of reinforcing phase TiC is lower than standard lattice parameter of TiC due to the C defection in TiC.

关键词： reaction synthesis α+α 2 matrix composites Ti 3AlC TiC

Microstructure Evolution of in situ （Ti3AIC ＋ TisSi3）/Ti3Al Composite Sheet with a Novel Quasi-continuous Chain Reinforcement Distribution Architecture Prepared by Using Roll Bonding and reaction Annealing

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2013年第12期29卷 1191-1196页

The Ti3AI matrix composite sheet with a novel quasi-continuous chain reinforcement distribution was prepared by using roll bonding and subsequent reaction annealing with pure Ti and SiCp/AI foils. The （Ti3AIC ＋ TisSi3） reinforcements were produced by in situ reaction of the as-rolled Ti-（SiCp/AI） laminated composite sheet after a two-stage annealing treatment including first annealing at 660 °C and second annealing at 1250 °C. The microstructure evolution during the reaction annealing was investigated. In the first reaction annealing, TiAI3 was formed, and the SiC particles were pushed together due to the Kirkendall effect, and after the second reaction annealing, Ti3AI, Ti3AIC and Ti5Si3 were synthesized. In addition, the reinforcement distribution presents a quasi-continuous chain microstructure in Ti3AI matrix composite sheet.

关键词： Composite Intermetallic Fabrication reaction synthesis