The Microstructure and Properties of Restored WCP/Fe-C Composites

2011 ◽  
Vol 194-196 ◽  
pp. 2105-2108
Author(s):  
Yan Pei Song ◽  
Hui Gai Wang
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Wear Behavior ◽  
Centrifugal Casting ◽  
X Ray Diffraction ◽  
Casting Method ◽  
X Ray ◽  
Microstructure And Properties

A restored WCP/Fe-C composites is manufactured by centrifugal casting method. The microstructure and properties of the restored composites have been investigated by SEM, X-ray diffraction and properties tester. The results show that the distribution of WCP in the restored composites is even, Size of WCP is obviously reduced, and their volume fraction attained to about 70 vol.%. The mechanical properties and wear behavior of the restored composites are almost the same as those of the primary composites.

Stress in Hydrogenated Microcrystalline Silicon Thin Films

1999 ◽  
Vol 557 ◽  
Author(s):  
D. Peiró ◽  
C. Voz ◽  
J. Bertomeu ◽  
J. Andreu ◽  
E. Martínez ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Vapor Deposition ◽  
Volume Fraction ◽  
Chemical Vapor ◽  
Hot Wire ◽  
X Ray Diffraction ◽  
Microcrystalline Silicon ◽  
X Ray ◽  
Silicon Thin Films ◽  
Abrupt Changes

AbstractHydrogenated microcrystalline silicon films have been obtained by hot-wire chemical vapor deposition (HWCVD) in a silane and hydrogen mixture at low pressure (<5 × 10-2 mbar). The structure of the samples and the residual stress were characterised by X- ray diffraction (XRD). Raman spectroscopy was used to estimate the volume fraction of the crystalline phase, which is in the range of 86 % to 98%. The stress values range between 150 and -140 MPa. The mechanical properties were studied by nanoindentation. Unlike monocrystalline wafers, there is no evidence of abrupt changes in the force-penetration plot, which have been attributed to a pressure-induced phase transition. The hardness was 12.5 GPa for the best samples, which is close to that obtained for silicon wafers.

Influence of Re-Melting Technology on Properties and Microstructures of Ferrous Matrix Composites Reinforced with Tungsten Carbide Particle

2011 ◽  
Vol 291-294 ◽  
pp. 1389-1392
Author(s):  
Yan Pei Song ◽  
Hui Gai Wang ◽  
Zhi Ming Feng ◽  
Zhen Kai Zhao
Keyword(s):  
Volume Fraction ◽  
Centrifugal Casting ◽  
Outer Region ◽  
Casting Process ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Before And After ◽  
Kg Medium ◽  
The Impact

The scrap WCP/Fe-C composites were re-melted in a 50 kg medium frequency induction furnace. A regenerated composites ring was manufactured by centrifugal casting process. The microstructure and properties of the composites before and after re-melting were investigated by SEM with energy dispersive spectroscopy and X-ray diffraction. The results showed that the microstructure of the composites after re-melting was composed of un-dissolved WCP, bainite, bone-like crystallites and graphite. The un-dissolved WCPwere uniformly distributed in the outer region of the regenerated composites ring, their volume fraction attained to about 65 vol. %, and size of the un-dissolved WCPwas obviously smaller than that of the WCPbefore re-melting. The impact toughness of the regenerated composites was below those of the composites before re-melting, the hardness and wear resistance of the regenerated composites were almost same as those of the composites before re-melting under the same test conditions.

Processing, Microstructure and Properties of Laminated Ni-Intermetallic Composites Synthesised Using Ni Sheets and Al Foils

2011 ◽  
Vol 56 (3) ◽  
pp. 693-702 ◽  
Author(s):  
M. Konieczny ◽  
R. Mola ◽  
P. Thomas ◽  
M. Kopciał
Keyword(s):  
Microprobe Analysis ◽  
Volume Fraction ◽  
Laminated Composites ◽  
Intermetallic Phase ◽  
Intermetallic Phases ◽  
Solid State Reactions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microstructure And Properties ◽  
Final Microstructure

Processing, Microstructure and Properties of Laminated Ni-Intermetallic Composites Synthesised Using Ni Sheets and Al FoilsThe laminated Ni-(NiAl3+Ni2Al3) and Ni-Ni2Al3intermetallic composites were fabricated by reaction synthesis in vacuum using Ni sheets and Al foils. The aluminium layers were completely consumed due to the formation of intermetallic phases. The Ni-Al reaction at 620°C was studied by interrupting in steps the reaction process to observe the microstructural changes. The final microstructure consisted of alternating layers of intermetallic phases and unreacted nickel can be designed easily because the stable structures of the composites depend only on the treating time. Microstructural examinations using scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray microprobe analysis (EDX) demonstrated that after 1h of treatment Ni2Al3is the predominant intermetallic phase. The formation of the Ni2Al3phase is thermodynamically favoured over the formation of the other phases and can be understood from the steps occurred through a series of solid state reactions. The tensile strength of the laminated composites increases with an increase of the volume fraction of the intermetallic products. However, it decreases after long heat treatment because the Ni2Al3/Ni2Al3interfaces can very easily delaminate due to a very weak bonding caused by continuous Al2O3inclusions. Observations show that the laminated composites exhibit a mixture of brittle fracture of intermetallics and ductile one of residual Ni layers.

Effect of h-BN on Sintering Behavior, Microstructures and Mechanical Properties of YAG Bulk Composites

2016 ◽  
Vol 697 ◽  
pp. 395-398 ◽  
Author(s):  
Shi Bin Li ◽  
Jie Guang Song ◽  
Hong Ying Ru ◽  
Xiao Bo Bai
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Precipitation Process ◽  
Sintering Behavior ◽  
Second Phase ◽  
X Ray Diffraction ◽  
Composite Powders ◽  
X Ray ◽  
Co Precipitation ◽  
Scanning Electron

The shell structure YAG composite powders with different volume fraction (15, 20 and 25vol%) micro h-BN have been prepared by co-precipitation process. The bulk composites were performed by pressure sintering at 1600°C under a pressure of 30MPa in vacuum. The mechanical properties (elastic modulus, hardness, and fracture toughness) and relative density of the composites were investigated detailedly. Furthermore, phase composition and microstructure of the composites were analyzed thoroughly by X-ray diffraction, scanning electron microscopy. Meanwhile, good machinability is maintained due to the low hardness of the second phase.

Investigation of the Mechanical Properties in Al/Al3Zr FGMs Fabricated by Centrifugal Casting Method

2009 ◽  
Vol 631-632 ◽  
pp. 379-384 ◽  
Author(s):  
Shimaa El Hadad ◽  
Hisashi Sato ◽  
Yoshimi Watanabe
Keyword(s):  
Mechanical Properties ◽  
Centrifugal Force ◽  
Volume Fraction ◽  
Centrifugal Casting ◽  
Compression Tests ◽  
Casting Method ◽  
Proof Stress ◽  
Force Direction ◽  
Hardness Values ◽  
Distribution Trends

Al-5mass%Zr FGMs fabricated by centrifugal casting method (CCM) have a very interesting microstructure. Since the intermetallics compounds of Al3Zr are plate in shape, Al3Zr platelet particles are almost oriented normal to the applied centrifugal-force direction. Considering this microstructure, the mechanical properties of Al/Al3Zr FGMs would vary for the same sample depending on the particles orientation and their volume fraction in the tested position. In this study, some mechanical properties of Al/Al3Zr FGMs were investigated. Al/Al3Zr FGMs rings were produced by CCM, under applied centrifugal force of 30, 60 and 120G (units of gravity). Microstructural observation along the centrifugal force direction was carried out. The platelet Al3Zr particles were almost oriented normal to the applied centrifugal force direction. The volume-fraction of Al3Zr particles increases close to the ring surface. Moreover, this distribution range of Al3Zr particles becomes broader with decreasing the applied centrifugal force. The same distribution trends were also observed for the hardness values. The Compression tests were also performed for further investigation of the mechanical properties. Samples under G=30 showed the lowest the 0.2%proof stress while those cast under G=120 had the highest 0.2% proof stress.

Effect of Glycerol on Properties of Tapioca Starch-Based Films

2014 ◽  
Vol 1060 ◽  
pp. 128-132 ◽  
Author(s):  
Piyapoom Piyawatakarn ◽  
Chutima Limmatvapirat ◽  
Pornsak Sriamornsak ◽  
Manee Luangtana-Anan ◽  
Jurairat Nunthanid ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
X Ray Diffraction ◽  
Casting Method ◽  
Tapioca Starch ◽  
X Ray ◽  
Texture Analyzer ◽  
Plasticization Effect ◽  
Elastic Film ◽  
Physical Entrapment ◽  
Starch Films

The aim of study was to determine the effect of glycerol on the properties of tapioca starch films. The films containing various amounts of glycerol (0-30 %w/w) were prepared by casting method. Texture analyzer, x-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) were used to comparatively characterize the films. The result indicated that mechanical properties were depended on amount of incorporated glycerol. The films containing 0-10 %w/w of glycerol showed brittle characteristic while those containing 20-30 %w/w demonstrated elastic film, suggesting the plasticization effect of glycerol. As indicated by x-ray diffractometry, the crystallinity was increased as increasing percentage of glycerol. The 3D structural change after incorporation of glycerol in polymer chain of starch might affect the properties of films. However, the FTIR spectra did not show clear interaction between glycerol and starch. The physical entrapment of glycerol in amylose chain might be a possible explanation for the results.

Effect of Annealing Temperature on Austenite Stability of a δ-TRIP Steel

2019 ◽  
Vol 818 ◽  
pp. 82-86
Author(s):  
Xin Xu ◽  
Ren Dong Liu ◽  
Bao Yu Xu ◽  
Hong Liang Yi ◽  
Guo Dong Wang
Keyword(s):  
Mechanical Properties ◽  
Trip Steel ◽  
Retained Austenite ◽  
Annealing Temperature ◽  
Volume Fraction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Austenite Stability ◽  
Poor Stability ◽  
Better Than

In this work, a novel type of δ-TRIP steel was designed, and the content and stability of retained austenite in δ-TRIP specimens under different annealing processes were detected and studied, respectively. The volume fraction of austenite was determined by X-ray diffraction (XRD). The microstructure and mechanical properties were analyzed systematically. The results show that a complex microstructure composed of three phases (ferrite, bainite and retained austenite) was obtained in the δ-TRIP steel. With the increasing of annealing temperature, both retained austenite and bainite content in the specimen increased, while the carbon content in retained austenite decreased, leading to a poor stability for retained austenite. Both tensile and yield strength improved with the increasing of annealing temperature, while the elongation reduced. The feature of retained austenite led to an excellent combination of ductility and strength, which was better than traditional TRIP steel.

Effect of Q-P-T Process on the Microstructure and Mechanical Properties of 300M Steel

2013 ◽  
Vol 749 ◽  
pp. 287-293 ◽  
Author(s):  
Rui Wen Zhao ◽  
Tian Qi Liu ◽  
Xin Qing Zhao
Keyword(s):  
Mechanical Properties ◽  
Retained Austenite ◽  
Volume Fraction ◽  
Optical Microscope ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microstructure And Mechanical Properties ◽  
300M Steel ◽  
The Difference ◽  
Evolution Of Microstructure

The effect of Quenching-Partitioning-Tempering (Q-P-T) process on the microstructure and mechanical properties of 300M steel were investigated. X-ray diffraction, scanning electron microscopy and optical microscope were employed to characterize the evolution of microstructure as well as the volume fraction of retained austenite. The results showed that the samples treated by Q-P-T possess more retained austenite compared with traditional Quenching-Tempering process. After Q-P-T, the strength increased slightly, while the ductility and toughness improved markedly. Microstructure analysis indicated the difference between Q-T and Q-P-T process lies in the amount of the retained austenite as well as the size and size distribution of the martensite laths. The Q-T resulted in a little of thin film-like retained austenite in addition to wide martensite strip, while the Q-P-T resulted in large amount of thick-like austenite accompanying narrow martensite strip. Therefore, 300M steel with better ductility and toughness could be obtained by Q-P-T heat treatment.

Synthesis and Mechanical Properties of Conventionally Cast Icosahedral Particle-Reinforced Al-Mn(-Cu)-Be-Si Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 3359-3362 ◽  
Author(s):  
Eric Fleury ◽  
H.J. Chang ◽  
D.H. Kim ◽  
Do Hyang Kim ◽  
Won Tae Kim
Keyword(s):  
Mechanical Properties ◽  
Phase Formation ◽  
Volume Fraction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Casting Technique ◽  
Conventional Casting ◽  
Mn Content ◽  
Icosahedral Particle ◽  
Conventionally Cast

The microstructure of the Al-Mn(-Cu)-Be-Si alloys analyzed by X-ray diffraction and TEM consisted of icosahedral (i) quasicrystal particles embedded in aAl matrix. The conjoint addition of Si and Be elements enabled the i-phase formation in Æ10 mm specimens prepared by conventional casting technique. The size, volume fraction and stability of the i-phase were found to be dependent on the Mn content. The addition of 2 at.% Cu did not affect the formation and stability of the i-phase but contributed significantly to the enhancement of the mechanical properties.

scholarly journals Investigating The Effect of Magnetite (Fe3O4) Nanoparticles on Mechanical Properties of Epoxy Resin

2021 ◽  
Vol 39 (6) ◽  
pp. 986-995
Author(s):  
Ehab Q. Kaadhm ◽  
Khansaa D. Salman ◽  
Ahmed H. Reja
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Fe3o4 Nanoparticles ◽  
Matrix Material ◽  
X Ray Diffraction ◽  
Casting Method ◽  
X Ray ◽  
Magnetite Fe3o4 ◽  
Reinforcing Material ◽  
Flexural Tests

In this paper, study the effects of magnetite nanomaterial Fe3O4 on the mechanical properties of epoxy. Dispersion of Fe3O4 nanoparticles in the epoxy resin was performed by ultrasonication. The samples of the nanocomposites were prepared using the casting method. The nanocomposites contain epoxy resins as a matrix material incorporated by different weight percentages of magnetite Fe3O4 that varies from 0wt.% to 15wt.% as a reinforcing material. The epoxy with the additive reinforcement materials Fe3O4 was slowly mixed in a sonication bath for 15 minutes, then the mixture poured into silicon molds. Field Emission Scanning Electron Microscopy FESEM and X-ray diffraction spectra XRD were used to characterize the morphological and structural properties of preparing samples and the distribution of Fe3O4 nanoparticles to the epoxy resin. Mechanical testing consists of tensile, hardness shore, and three-point flexural tests were performed on the samples at room temperature according to ASTM standards. The results showed that reinforcement by 15wt.% of Fe3O4 nanoparticles maximizes these mechanical properties of nanocomposites compared with pure epoxy except for the young modulus's preferred weight at 9 wt.%, this is due to aggregation of the additives nanomaterials in epoxy resin above 9 wt.%.

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