Effects of V addition on the solidification microstructures and room temperature compression properties of NiAl–Cr(Mo) hypereutectic alloy

The present study reports on the microstructural evolution and room temperature plasticity of V(-Si)-B alloys with respect to the V solid solution (VSS)-V3B2 phase region. To investigate the occurring effects systematically, different binary V-B and ternary V-Si-B alloys were produced by conventional arc melting. Scanning electron microscope (SEM) analyses and X-ray diffraction (XRD) measurements were used to characterize the resulting as-cast microstructures. For the first time, the eutectic composition was systematically traced from the binary V-B domain to the ternary V-Si-B system. The observations discover that the binary eutectic trough (VSS-V3B2) seems to reach into the ternary system up to an alloy composition of V-5Si-9B. Room temperature compression tests were carried out in order to study the impact of single-phase and multi-phase microstructures on the strength and plasticity of binary and ternary alloys. The results indicate that the VSS phase controls the plastic deformability in the VSS-V3B2 eutectic microstructure whereas the intermetallic V3B2 acts as a strong hardening phase.

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Effects of Elevated Temperatures on the Compression Strength of Nanoclay Filled Unsaturated Polyester Resin

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.554.208 ◽

2014 ◽

Vol 554 ◽

pp. 208-212 ◽

Cited By ~ 1

Author(s):

M.S. Fartini ◽

M.S. Abdul Majid ◽

Mohd Afendi ◽

N.A.M. Amin ◽

Azizul Mohamad

Keyword(s):

Compressive Strength ◽

Elastic Modulus ◽

Room Temperature ◽

Elevated Temperatures ◽

Unsaturated Polyester ◽

Polyester Resins ◽

Weight Percentage ◽

Compression Properties ◽

Strain Behaviour ◽

Compressive Tests

The paper describes the effects of the montmorillonite (MMT) fillers commonly known as nanoclay, on the compression properties of unsaturated polyester resins at different weight percentage of nanoclay. Modified resin specimens with 1, 3 and 5 wt. % of nanoclay contents were prepared and subjected to compressive tests according to ASTM D695. The static uniaxial compression testing were conducted at various temperatures ranging from room temperature (RT) to the temperature closer to its glass transition temperature Tg to study the effect of nanoclay fillers on the compressive stress-strain behaviour at high temperatures (room temperature, 35, 45, and 75°C). The mechanical properties of the nanomodified resin including the elastic modulus, maximum stress and failure strain were determined. The experimental results imply that adding these nanoclay fillers has enhanced the elastic modulus, compressive strength, and toughness without sacrificing the strain to failure and thermal stability of the unsaturated polyester. However it was found that generally, all specimens showed degradation in compressive strength with increases in temperatures.

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Microstructure and mechanical behavior of cast Ti-6Al-4V with addition of boron

Open Engineering ◽

10.2478/s13531-012-0004-6 ◽

2012 ◽

Vol 2 (3) ◽

Cited By ~ 2

Author(s):

Robert Pederson ◽

Raghuveer Gaddam ◽

Marta-Lena Antti

Keyword(s):

Grain Size ◽

Yield Strength ◽

Room Temperature ◽

Compressive Yield Strength ◽

Strain Rates ◽

Beta Transus ◽

Microstructural Refinement ◽

Compression Properties ◽

Transus Temperature ◽

Cast Microstructure

AbstractThe effect of boron (between 0.06 and 0.11 wt%) on the microstructure, hardness and compression properties of cast Ti-6Al-4V was investigated. Compression properties were examined in the temperature range from room temperature to 1000°C. It was found that the addition of boron refines the as-cast microstructure in terms of prior beta grain size and alpha colony size. This microstructural refinement led to an increase in compressive yield strength from room temperature up to 700°C. Three different strain rates (0.001, 0.1 and 1 s−1) were evaluated during compression testing from which it was found that the compressive yield strength decreased with decreasing strain rate from 600°C up to the beta transus temperature.

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Study of the Effects of Al, Ta, W Additions on the Microstructure and Properties of Mosi2 Base Alloys

MRS Proceedings ◽

10.1557/proc-364-911 ◽

1994 ◽

Vol 364 ◽

Cited By ~ 7

Author(s):

A. Stergiou ◽

P. Tsakiropoulos

Keyword(s):

Room Temperature ◽

Lamellar Microstructure ◽

Rapid Quenching ◽

Al Alloy ◽

Phase Selection ◽

Complete Solid Solubility ◽

Wheel Side ◽

Two Phases ◽

Solidification Microstructures ◽

Thermal Stability Of

AbstractSolidification microstructures and phase selection in ingots and melt-spun ribbons of MoSi2, MoSi2-W-Ta and MoSi2-Al alloys were studied. Rapid quenching from the melt refined the grain size of all alloys by two orders of magnitude compared to the ingots. Zone A microstructures were formed in the wheel side of all alloy ribbons. Addition of W and Ta and of Al suppressed the formation of Mo5Si3 in the ingots and ribbons. Tungsten exhibited complete solid solubility in MoSi2. In the ribbons the solubility of Ta in MoSi2 was extended to 2 at% in Zone A, and in the ingots and zone B of the ribbons hexagonal (C40) TaSi2 and tetragonal (C11b) MoSi2 structures were formed. A fine lamellar microstructure between the Cllb and C40 phases was formed at 1350°C after 48h. Addition of Al changed dramatically the solidification microstructure which consisted of two phases C40 Mo(Al0.5Si0.5)2 and C54 MoAl1.3Si0.7. In the ingots the room temperature hardness decreased with addition of W and Ta and of Al. Addition of Al increased the thermal stability of the MoSi2-Al alloy.

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Microstructure Evolution and Compression Properties of a Directionally Solidified Ni-24.8%Nb Hypereutectic Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.654-656.1351 ◽

2010 ◽

Vol 654-656 ◽

pp. 1351-1354

Author(s):

Shuang Ming Li ◽

Bing Lun Jiang ◽

Heng Zhi Fu

Keyword(s):

Mechanical Properties ◽

Microstructure Evolution ◽

Growth Velocity ◽

Thermal Gradient ◽

Hypereutectic Alloy ◽

Directionally Solidified ◽

In Situ Composites ◽

Compression Properties ◽

Deformation Behaviors

At normal solidification conditions, in-situ composites of a Ni-24.8%Nb hypereutectic alloy can be produced at growth velocities below 5μm/s, with a thermal gradient of 180K/cm, and this low productivity remarkably restricts the application of this kind of in-situ composites. In this paper, we proposed an approach that employs an abrupt growth velocity to make the in-situ composites grow stably out of the coupled zone. In-situ composites of the Ni-24.8%Nb hypereutectic alloy were obtained at a growth velocity of 100μm/s and the productivity was greatly improved. This value is in the same order magnitude imposed on the single-crystal superalloys. The compression strengths were investigated on different microstructures involving the coupled eutectics and non-coupled eutectics. The results showed that the crack distribution and extension were mainly localized in primary Ni3Nb dendrites in the non-coupled eutectics, and that in-situ composites with the entirely coupled eutectics have improved mechanical properties and different deformation behaviors.

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Tensile and Compressive Properties of Woven Kenaf/Glass Sandwich Hybrid Composites

International Journal of Polymer Science ◽

10.1155/2016/1235048 ◽

2016 ◽

Vol 2016 ◽

pp. 1-6 ◽

Cited By ~ 19

Author(s):

Mohaiman J. Sharba ◽

Z. Leman ◽

M. T. H. Sultan ◽

M. R. Ishak ◽

M. A. Azmah Hanim

Keyword(s):

Mechanical Properties ◽

Room Temperature ◽

Hybrid Composites ◽

Unsaturated Polyester ◽

Weight Fraction ◽

Compressive Properties ◽

Glass Composite ◽

Compression Properties ◽

Three Stages ◽

Woven Kenaf

Monotonic (tensile and compression) properties of woven kenaf/glass reinforced unsaturated polyester sandwich hybrid composites have been experimentally investigated. Five types of composites laminates were fabricated using a combination of hand lay-up and cold press techniques, postcured for two hours at 80°C and left for 48 hours at room temperature. The hybrid composites contained fixed six layers of glass as a shell, three on each side, whereas the number of core kenaf layers was changed in three stages to get S1, S2, and S3 hybrid composites. Composites specimens with pure glass and kenaf were also fabricated for comparison. It was found that one kenaf layer replaced about 20% of total fiber weight fraction of the composite; this leads to reducing the density of final hybrid composite by 13%. Besides, in mechanical properties perspective, there are less than 1% reduction in compression strength and 40% in tensile strength when compared to pure glass composite. Generally, the results revealed that the best performance was observed in S1, which showed a good balance of all mechanical properties determined in this work.

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Room temperature and high temperature sealing properties and compression properties of compressive gaskets made of micrometric vermiculite particles

Applied Clay Science ◽

10.1016/j.clay.2015.03.025 ◽

2015 ◽

Vol 114 ◽

pp. 1-8 ◽

Cited By ~ 5

Author(s):

A.N. Nguyen ◽

L. Mirabel ◽

L. Duclaux ◽

L. Reinert ◽

P. Dehaudt ◽

...

Keyword(s):

High Temperature ◽

Room Temperature ◽

Compression Properties

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Study on Compression Behaviour of AZ31 Magnesium Alloy at Room-Temperature

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.476-478.1960 ◽

2012 ◽

Vol 476-478 ◽

pp. 1960-1964

Author(s):

Jia Le Sun ◽

Rui Chun Li ◽

Gao Feng Quan ◽

Zhao Ming Liu

Keyword(s):

Magnesium Alloy ◽

Strain Hardening ◽

Room Temperature ◽

Deformation Behaviour ◽

Az31 Alloy ◽

Strain Hardening Exponent ◽

Surface Cracks ◽

Compression Properties ◽

Compression Behaviour ◽

Az31 Mg Alloy

The microstructure, surface morphology, compression properties, deformation behaviour and strain hardening exponent of as-cast and as-extruded AZ31 Mg alloy after different annealing treatments were investigated. The results show that the compression properties are great different between cast AZ31 alloy and extruded AZ31 alloy. Extruded AZ31 alloy is discontinuous yield and on the surface no signs of damage have been observed; on the contrast, cast AZ31 alloy is continuous yield and shows wavy patterns, and the surface cracks can be easily found. In addition, there is a linear relationship between the strain hardening exponent in first deformation stage and the yield ratio. Further more, the twinning mechanism plays very different role in cast AZ31 alloy and extruded AZ31 alloy.

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Development and Characterization of Novel Interpenetrating Network (IPN) Foams from Epoxy Ester and Aliphatic Epoxy Resin

E-Journal of Chemistry ◽

10.1155/2009/481912 ◽

2009 ◽

Vol 6 (2) ◽

pp. 341-347 ◽

Cited By ~ 2

Author(s):

Kanuprasad Patel ◽

Dhirubhai Desai ◽

Santosh Bhuva

Keyword(s):

Epoxy Resin ◽

Room Temperature ◽

Glycidyl Ether ◽

Diglycidyl Ether ◽

Interpenetrating Network ◽

Acrylate Monomer ◽

Molar Ratios ◽

Compression Properties ◽

Rise Direction

Diglycidyl ether of bisphenol-A (DGEBA) was reacted with acrylate monomer at variable molar ratios. The reaction between glycerine and epichlorohydrine form glycidyl ether of polyol aliphatic epoxy resin. The resultant resins were characterized duly. Both the resins were mixed at different ratios with constant high shear stirring. The obtained mixture and suitable additives were heated at 150oC for one and half hour. The so called Interpenetrating Network (IPN) transformed into foams. The performance of foams was evaluated by testing for compression in both parallel and perpendicular to rise direction. The tests were carried out at room temperature and at the elevated temperature. The compression properties showed a decreasing trend for increasing amounts of glycerine resin. The density and thermal properties of epoxy foams were also evaluated. The relation between the composition, density and properties of the foam was analyzed.

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