Effect of TiC Particles on Microstructure and Properties of Al-Fe-V-Si Alloy

2014 ◽  
Vol 543-547 ◽  
pp. 3725-3728
Author(s):  
Rong Hua Zhang ◽  
Biao Wu
Keyword(s):  
Room Temperature ◽  
Volume Fraction ◽  
Hot Extrusion ◽  
Spray Forming ◽  
Forming Process ◽  
Heat Resistant ◽  
Lower Temperature ◽  
In Situ Tic ◽  
Better Than

Heat-resistant Al-Fe-V-Si aluminum alloys enhanced by in-situ TiC particles have been prepared by spray forming process with suitable process parameters. Research results show that the microstructure of as-deposited alloy is fine and homogeneous. In-situ TiC particles prevent the unsteady phases from coming into being. On the other hand, the TiC particles increase the volume fraction of heat-resistant phases. So the mechanical properties of the enhanced alloy by in-situ TiC particles are better than that of Al-Fe-V-Si alloy without TiC particles. The hot extrusion temperature is also an important parameter to understand. Under the permission, it is better to extrude the alloy at lower temperature. The tensile strength of the alloy without TiC particles is about 435MPa at room temperature and is about 204MPa at 350°C. However, when the alloy is enhanced by in-situ TiC particles, the strength of alloy is about 482MPa at room temperature and is about 224MPa at 350°C temperature.

Research on Preparation of Al-Fe-V-Si Alloy Enhanced by In-Situ TiC Particles

2005 ◽  
Vol 475-479 ◽  
pp. 2857-2860
Author(s):  
Bao Hong Zhu ◽  
Yong'an Zhang ◽  
Bai Qing Xiong ◽  
Hong Wei Liu ◽  
Li Kai Shi
Keyword(s):  
Room Temperature ◽  
Volume Fraction ◽  
Hot Extrusion ◽  
Spray Forming ◽  
Forming Process ◽  
Heat Resistant ◽  
Lower Temperature ◽  
In Situ Tic ◽  
Better Than

Heat-resistant Al-Fe-V-Si aluminum alloys enhanced by in-situ TiC particles have been prepared by spray forming process with suitable process parameters. Research results show that the microstructure of as-deposited alloy is fine and homogeneous. In-situ TiC particles prevent the unsteady phases from coming into being. On the other hand, the TiC particles increase the volume fraction of heat-resistant phases. So the mechanical properties of the enhanced alloy by in-situ TiC particles are better than that of Al-Fe-V-Si alloy without TiC particles. The hot extrusion temperature is also an important parameter to understand. Under the permission, it is better to extrude the alloy at lower temperature. The tensile strength of the alloy without TiC particles is about 435MPa at room temperature and is about 204MPa at 350°C. However, when the alloy is enhanced by in-situ TiC particles, the strength of alloy is about 482MPa at room temperature and is about 224MPa at 350°C temperature.

Newly Developed Heat Resistant Magnesium Alloy by Thixomolding®

2005 ◽  
Vol 488-489 ◽  
pp. 287-290 ◽  
Author(s):  
Tadayoshi Tsukeda ◽  
Ken Saito ◽  
Mayumi Suzuki ◽  
Junichi Koike ◽  
Kouichi Maruyama
Keyword(s):  
Aluminum Alloy ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Die Casting ◽  
The Other ◽  
Heat Resistant ◽  
Higher Temperature ◽  
Better Than

We compared the newly developed heat resistant magnesium alloy with conventional ones by Thixomolding® and aluminum alloy by die casting. Tensile properties at elevated temperatures of AXEJ6310 were equal to those of ADC12. In particular, elongation tendency of AXEJ6310 at higher temperature was better than those of the other alloys. Creep resistance of AXEJ6310 was larger than that of AE42 by almost 3 orders and smaller than that of ADC12 by almost 2 orders of magnitude. Fatigue limits at room temperature and 423K of AXEJ6310 was superior among conventional magnesium alloys.

Efficient and Semiefficient Vulcanization Systems Employing 2-(Morpholinodithio)-Benzothiazole Generated in Situ

1977 ◽  
Vol 50 (1) ◽  
pp. 90-98
Author(s):  
J. P. Lawrence
Keyword(s):  
Heat Resistance ◽  
Experimental System ◽  
Heat Resistant ◽  
Molar Basis ◽  
Direct Replacement ◽  
Better Than

Abstract The MBTS-N-(morpholinothio)phthalimide vulcanization system has been found to be effective in producing heat resistant semi-EV and EV cures in a variety of representative rubbers. When used as a direct replacement on a molar basis for 2-(morpholinodithio)benzothiazole (MDB), improvements in processing safety were found in all cases studied. In this respect it is most effective in NR, SBR, and NBR. The experimental system also generally gave slower-curing stocks. The heat resistance of the experimental stocks was found to be equal to or better than that of the MDB control stocks. Substantial improvements in heat resistance for both SBR and IIR unexpectedly resulted from the use of the MBTS—imide system. This result suggests that the nature of the crosslinks formed by the two vulcanization systems are to some extent different in these two elastomers. This, in turn, may reflect upon the mechanisms of crosslink formation.

Application of Acetate Starch to Colloidal In Situ Consolidation Molding Process of Alumina Ceramic

2007 ◽  
Vol 336-338 ◽  
pp. 980-983
Author(s):  
Xiao Xi Li ◽  
Ling Chen ◽  
Jian Dong Ye ◽  
Lin Li ◽  
Yan Ran Huang
Keyword(s):  
Volume Fraction ◽  
Starch Content ◽  
Linear Shrinkage ◽  
Alumina Ceramic ◽  
Solid Loading ◽  
Green Body ◽  
Forming Process ◽  
Molding Process ◽  
Good Thermal Stability

A new consolidation in-situ forming process for high-performance alumina ceramic using acetate starch was investigated. The pasting behavior and thermogelling properties of acetate starch and the effects of different amount of acetate starch and solid loading on the rheologic behavior of the ceramic slip, as well as the linear shrinkage, density, strength and microstructure of the green body were discussed. The results indicate that acetate starch paste has good thermal stability and gelling ability. When the content of acetate starch is about 0.5%~1.5% (mass fraction), the apparent viscosity of alumina slurry, which is always less than 1Pa·s even for 58% (volume fraction) dense suspension, increased with increasing the acetate starch content and solid loading. That results in easier to cast. Moreover, with the increasing of solid loading the linear shrinkage and dry strength of green bodies decreased and the relative density increased. With the increasing starch content, the linear shrinkage rate and the density of the dried body decreased, while the strength of the dried body almost linearly increased. The green body with homogeneously-distributed density and pore size was also obtained in this work. It is concluded that Al2O3 ceramics can be consolidation in-situ formed based on the gelling network of thermally swelled and gelatinized acetate starch.

In situ Temperature Measurement During Spray Forming of A2-tool Steel and Axisymmetric Two-dimensional Analysis

2000 ◽  
Vol 15 (8) ◽  
pp. 1669-1678 ◽  
Author(s):  
B. C. Moon ◽  
Z. H. Lee ◽  
D. R. White ◽  
E. J. Lavernia
Keyword(s):  
Experimental Data ◽  
Temperature Measurement ◽  
Tool Steel ◽  
Video Camera ◽  
Spray Forming ◽  
Cooling Curve ◽  
Two Dimensional ◽  
Forming Process ◽  
Infrared Video

An in situ temperature measurement was performed during spraying of A2-tool steel, and the results were used to verify an axisymmetric two-dimensional computer simulation program, which was developed for the prediction of shape and temperature variation in a spray-forming process. A thin thermocouple was placed inside of the chamber in advance and brought to the surface of the deposit during spraying. The temperature was then recorded. The surface temperature of the deposit was also measured by an infrared video camera. The emissivity of the surface of A2-tool steel during spraying was determined to be 0.23 through comparison of the temperatures measured by the thermocouple with the ones measured by the infrared video camera. The heat transfer coefficient at the top surface was estimated by comparing the calculated results with the experimental data. The cooling curve predicted on the basis of the numerical simulation showed good agreement with the experimental data.

In Situ Fabrication and Properties of (Al3Ti)P/6351 Composites

2010 ◽  
Vol 152-153 ◽  
pp. 1437-1440
Author(s):  
Gui Rong Li ◽  
Yu Tao Zhao ◽  
Hong Ming Wang ◽  
Gang Chen
Keyword(s):  
Grain Size ◽  
Aluminum Alloy ◽  
Room Temperature ◽  
Volume Fraction ◽  
In Situ Reaction ◽  
Conventional Process ◽  
Wrought Aluminum

(Al3Ti)p/6351 composites were in situ synthesized via direct melt reaction between 6351 wrought aluminum alloy and K2TiF6 at 720°C. OM, SEM and EDS are utilized to analyze the microstructure and components of composites. The fusing agents of CaF2 and LiCl are mixed with K2TiF6 to lower the temperature of initial in situ reaction. The volume fraction of Al3Ti is 3%.The size of Al3Ti is in the range of 2~4μm, which is much lowered than that fabricated by conventional process. Due to the calcium element from CaF2 the size of Mg2Si phases are decreased to 1~2μm.The microns of independent silicon phases are also observed in the squeezed section. The grain size of α-Al is fined to 30~40μm, which is due to the disperse effect of Al3Ti. The tensile, yield properties and elongation are at room temperature are 365MPa, 320MPa and 10.2%.

scholarly journals Effect of Zn and Ca Addition on Microstructure and Strength at Room Temperature of As-Cast and As-Extruded Mg-Sn Alloys

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1490 ◽  
Author(s):  
Yang Zhang ◽  
Leipeng Song ◽  
Xiaoyang Chen ◽  
Yalin Lu ◽  
Xiaoping Li
Keyword(s):  
Dynamic Recrystallization ◽  
Room Temperature ◽  
Volume Fraction ◽  
Hot Extrusion ◽  
Fiber Texture ◽  
Ca Addition ◽  
The Matrix ◽  
Mg2sn Phase

In this study, the effect of Zn and Ca addition on microstructure and strength at room temperature of Mg-Sn alloys was investigated by comparison of Mg-6Sn, Mg-6Sn-2Zn, and Mg-6Sn-2Zn-1Ca alloys in as-cast and as-extruded states. In the as-cast samples, α-Mg and Mg2Sn phases were the main phases of Mg-6Sn and Mg-6Sn-2Zn alloys, while the CaMgSn phase was formed in Mg-6Sn-2Zn-1Ca alloy due to the addition of the Ca element. Mg2Sn phase dissolved into the matrix during homogenization while CaMgSn phase remained. Incomplete dynamic recrystallization (DRX) took place in these alloys during hot extrusion. Fine Mg2Sn precipitates were observed in α-Mg matrix of as-extruded samples. Zn showed little influence on microstructure, whereas Ca reduced the volume fraction of un-DRXed grains and increased the size of DRXed grains. As-extruded Mg-Sn alloys exhibited typical fiber texture. The strength at room temperature of Mg-Sn alloys improved significantly after hot extrusion. The addition of Zn element was beneficial to the strength at room temperature of the Mg-6Sn alloy, while the further addition of Ca element was harmful to the strength. Among these alloys, the Mg-6Sn-2Zn alloy exhibited the best strength at room temperature in both as-cast and as-extruded states.

Fabrication of In Situ TiC Reinforced Ti Matrix Composites by Thermomechanical Consolidation of TiH2/CNTs Powder Mixtures

2016 ◽  
Vol 704 ◽  
pp. 55-67
Author(s):  
Yi Feng Zheng ◽  
Xun Yao ◽  
Yong Jun Su ◽  
De Liang Zhang
Keyword(s):  
Room Temperature ◽  
Spherical Shape ◽  
Matrix Composites ◽  
Ultrafine Grained ◽  
Multi Walled Carbon Nanotubes ◽  
Alpha Titanium ◽  
Mechanical Performances ◽  
Walled Carbon Nanotubes ◽  
In Situ Tic

In this work, in-situ TiC reinforced Ti matrix composites (TMCs) have been fabricated via blending TiH2 powder and multi-walled carbon nanotubes (CNTs) followed by thermomechanical consolidation of the TiH2/CNTs powder mixture. The dehydrogenation, in situ reaction and consolidation occurred simultaneously and took less than 15 minutes in total. The effect of CNTs content (1 and 3 vol.% (0.56 and 1.69 wt.%)) on the evolution of microstructures and mechanical performances of the extruded samples has been investigated. The results showed that the extruded TMCs had a duplex microstructure consisting of coarse alpha titanium grains and ultrafine grained (UFG) regions, and the in-situ formed TiC particles had a near-spherical shape. The extruded sample with 1 vol.% (0.56 wt.%) CNTs reinforced exhibited a yield strength of 807.3 MPa, ultimate tensile strength of 1085.9 MPa and elongation to fracture of 3.3% at room temperature. The mechanism of microstructural evolution and material failure are discussed.e are discussed.

Effect of volume fraction of reinforcement on room temperature tensile property of in situ (TiB+TiC)/Ti matrix composites

2006 ◽  
Vol 27 (6) ◽  
pp. 494-498 ◽  
Author(s):  
Min-min Wang ◽  
Wei-jie Lu ◽  
Jining Qin ◽  
Fengcang Ma ◽  
Junqiang Lu ◽  
...  
Keyword(s):  
Tensile Property ◽  
Room Temperature ◽  
Volume Fraction ◽  
Matrix Composites ◽  
Room Temperature Tensile Property

Preparation and Dielectric Properties of Cu/PVDF Composite Films

2014 ◽  
Vol 1035 ◽  
pp. 417-421 ◽  
Author(s):  
Jian Wen Zhai ◽  
Ya Jun Wang ◽  
Jian Lou Deng ◽  
Chang Gen Feng
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Room Temperature ◽  
Volume Fraction ◽  
Composite Films ◽  
Interfacial Polarization ◽  
Dielectric Constants ◽  
Pvdf Film ◽  
Continuous Increase ◽  
Better Than

nanoand micro size Cu were employed separately and investigated comparatively. Different volume fraction of Cu was added into PVDF film in order to investigate the content of filler effect on the dielectric properties of polymer composites. XRD and SEM were used to analyze the crystalline phase and microstructure of the films. The results show that two sizes of Cu have the same peak features, and with the continuous increase of the content of Cu, it disperse better in PVDF. The dielectric constant (ε) of the composite containing 16 vol% micro-CCTO filler is 16 at 100 Hz and room temperature, and its dielectric loss (tanδ) is only 0.15, which is substantially better than others. Besides, for 18 vol% nanoCu/PVDF composite tanδis 0.25 andεis 18 at 100 Hz. Moreover,εand tanδof nanoCu/PVDF composite are both higher than those of micro-Cu/PVDF. Analysis shows that the composites with nanoCu have higher dielectric constants, which is mainly from the interfacial polarization.

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