Materials Science and Engineering: A

Items from 1 to 20 out of 51 results

article

Stress-induced non-equilibrium grain boundary segregation of phosphorus in a Cr–Mo low alloy steel

S.-H. Song, J. Wu, D.-Y. Wang, L.-Q. Weng, more

Materials Science & Engineering A > 2006 > 430 > 1-2 > 320-325

Grain boundary segregation of phosphorus under a 40MPa tensile stress at 520°C in a 0.025wt.% P-doped 2.25Cr1Mo steel, which has already been thermally equilibrated, is examined using Auger electron spectroscopy. The segregation of phosphorus during stress-ageing has a non-equilibrium characteristic, i.e. it is non-equilibrium segregation. The segregation level first increases with increasing stress-ageing...

article

Nanoindentation and nanomachining characteristics of gold and platinum thin films

Te-Hua Fang, Win-Jin Chang, Cheng-I Weng

Materials Science & Engineering A > 2006 > 430 > 1-2 > 332-340

Molecular dynamics (MD) simulation and an experimental method were carried out to study the effects of applied load, hold time, and temperature on nanoscratching and nanoindentation of gold and platinum thin films. The simulated results showed that the wear depth of gold decreased as the scratching velocity was increased and the temperature was decreased. The results also indicated that when the simulated...

article

Phase relations, lattice thermal expansion in Ce1−xEuxO2−x/2 and Ce1−xSmxO2−x/2 systems and stabilization of cubic RE2O3 (RE: Eu, Sm)

Balaji P. Mandal, V. Grover, A.K. Tyagi

Materials Science & Engineering A > 2006 > 430 > 1-2 > 120-124

The phase relations in CeO ₂ –Eu ₂ O ₃ and CeO ₂ –Sm ₂ O ₃ systems have been established under slow-cooled conditions from 1400°C. The two-phase relations differ as the CeO ₂ –Eu ₂ O ₃ system showed only two monophasic phase fields, namely F-type cubic and C-type cubic, whereas CeO ₂ –Sm ₂ O ₃ system showed...

article

Differentiation of the surface topographies of pharmaceutical excipient compacts

P. Narayan, B.C. Hancock, R. Hamel, T.S. Bergstrom, more

Materials Science & Engineering A > 2006 > 430 > 1-2 > 79-89

The comparison of conventional surface metrology and area-scale fractal parameters to differentiate the surface topography of pharmaceutical excipient compacts and preliminary investigation of scale-based correlations with excipient properties were performed. The determination and selection of the most appropriate surface topography parameters is important in optimizing the design and quality of industrial...

article

Effects of lower cobalt binder concentrations in sintering of tungsten carbide

Tao Li, Qingfa Li, J.Y.H. Fuh, Poh Ching Yu, more

Materials Science & Engineering A > 2006 > 430 > 1-2 > 113-119

Cemented tungsten carbides have received much attention because of their superior characteristics. Traditional cemented tungsten carbides usually contain 3–30wt% binder phase. In this paper, WC with low Co concentration less than 3wt% is studied using traditional powder metallurgy. The binder phase has tremendous effect on sinterability of WC. High sinterability and high hardness can be achieved for...

article

Morphological and structural characterisation of electrodeposited Zn–Mn alloys from acidic chloride bath

C. Savall, C. Rebere, D. Sylla, M. Gadouleau, more

Materials Science & Engineering A > 2006 > 430 > 1-2 > 165-171

Zn–Mn coatings were electrodeposited on steel substrate from an acidic chloride bath containing a commercial additive used in zinc plating. The effects of deposition parameters such as stirring, applied current density or potential and temperature on the coating composition, microstructure and crystallography were investigated. It was found that this additive permits to obtain dense, compact and thick...

article

The development of superplastic ductilities and microstructural homogeneity in a magnesium ZK60 alloy processed by ECAP

Roberto B. Figueiredo, Terence G. Langdon

Materials Science & Engineering A > 2006 > 430 > 1-2 > 151-156

An extruded ZK60 magnesium alloy was processed by equal-channel angular pressing (ECAP) and then tested in tension at elevated temperatures. The results show the alloy is superplastic at a testing temperature of 473K with an optimum ductility of ∼1310% when using an initial strain rate of 2.0×10 ⁻⁴ s ⁻¹ . The results demonstrate that optimum superplasticity is achieved at intermediate...

article

Synthesis of MoSi2–Al2O3 nanocomposite by mechanical alloying

M. Zakeri, R. Yazdani-Rad, M.H. Enayati, M.R. Rahimipoor

Materials Science & Engineering A > 2006 > 430 > 1-2 > 185-188

MoSi ₂ –Al ₂ O ₃ nanocomposite was synthesized by mechanical alloying (MA) of MoO ₃ , SiO ₂ and Al powder mixture. The structural evolution of the powders was studied by X-ray diffraction (XRD). Both β-MoSi ₂ and α-MoSi ₂ were obtained after 3h of milling. The spontaneous formation of β-MoSi ₂ during milling proceeded by a mechanically...

article

Microstructure and grain refining performance of Al–5Ti–1B master alloy prepared under high-intensity ultrasound

Yanfeng Han, Da Shu, Jun Wang, Baode Sun

Materials Science & Engineering A > 2006 > 430 > 1-2 > 326-331

The microstructure and grain refining performance of an Al–5Ti–1B master alloy prepared under high-intensity ultrasound were investigated. With applying continuous high-intensity ultrasound vibrations in the reaction, the Al–5Ti–1B master alloy is successfully manufactured in 4min. Compared with conventional Al–5Ti–1B master alloys, the mean size and the size spread of TiB ₂ particles in the...

article

Microstructural characterization of precipitates in Cu–10wt.%Al–0.8wt.%Be shape-memory alloy

H.H. Kuo, W.H. Wang, Y.F. Hsu

Materials Science & Engineering A > 2006 > 430 > 1-2 > 292-300

Microstructural characterization of α ₁ -plate and γ ₂ phase precipitated in hypoeutectoid Cu–10wt.%Al–0.8wt.%Be shape-memory alloy (SMA) aged at 200°C for different periods of time (20–160h) is researched in this study. High-resolution transmission electron microscope (HRTEM) was employed to investigate the α ₁ -plate with 18R long period stacking order structure (LPSO) in...

article

Influence of the green density on the dewaxing behaviour of uniaxially pressed powder compacts

S. Giménez, A. Vagnon, D. Bouvard, O. Van der Biest

Materials Science & Engineering A > 2006 > 430 > 1-2 > 277-284

The effect of the green density on the dewaxing behaviour of two different uniaxially pressed iron based powder metallurgy alloys has been characterised by means of non-destructive mechanical and microstructural techniques, i.e. impulse excitation technique and synchrotron tomography. The elastic and damping properties of the green and dewaxed specimens pressed to two different densities have been...

article

Author index of volume 430

Materials Science & Engineering A > 2006 > 430 > 1-2 > 355-356

article

Nanostructure in a Ti alloy processed using a cryomilling technique

Fusheng Sun, Paula Rojas, Alejandro Zúñiga, Enrique J. Lavernia

Materials Science & Engineering A > 2006 > 430 > 1-2 > 90-97

A nanocrystalline Ti alloy with a uniform distribution of grains was synthesized using cryogenic mechanical milling. The effects of cryomilling parameters, such as milling time and ball to powder ratio (BPR), on the particle size, grain size, chemistry, and structure of cryomilled Ti powders were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron...

article

Editorial Board

Materials Science & Engineering A > 2006 > 430 > 1-2 > CO2

article

Experimental validation of FE predicted fracture behaviour in thermally sprayed coatings

P. Bansal, P.H. Shipway, S.B. Leen, L.C. Driver

Materials Science & Engineering A > 2006 > 430 > 1-2 > 104-112

The fracture behaviour of a brittle coating on a substrate is not only governed by its intrinsic fracture strength, but also by a range of other parameters. In order to be able to understand (and thus predict) the fracture response, it is very important to accurately determine the key coating properties such as elastic modulus, residual stresses and fracture strength. In the present work, the fracture...

article

Research on low cycle fatigue properties of TA15 titanium alloy based on reliability theory

Fuguo Li, Xiaolu Yu, Leikui Jiao, Qiong Wan

Materials Science & Engineering A > 2006 > 430 > 1-2 > 216-220

This paper introduces a method to determine the symmetric cycle fatigue limit of TA15 alloy at given confidence γ and survival probability P. It gives a general method to calculate the true survival probability of this material fatigue limit. The median and data of the LCF at γ=95% and P=99.9% are acquired after studying the LCF properties of aircraft construction material TA15 at the temperature...

article

Microstructural characterization of Al-7075-T651 chips and work pieces produced by high-speed machining

C.E. Campbell, L.A. Bendersky, W.J. Boettinger, R. Ivester

Materials Science & Engineering A > 2006 > 430 > 1-2 > 15-26

High-speed orthogonal machining produced a series of Al-7075-T651 chips and work pieces for microstructural charcterization. The orthogonal machining conditions included two rake angles, three cuttings speeds, and a constant feed rate. The chips and work pieces were characterized using optical metallography, transmission electron microscopy (TEM), and microhardness measurements. TEM observations indicated...

article

Al–Si coating fused by Al+Si powders formed on Ti–6Al–4V alloy and its oxidation resistance

W. Zhou, Y.G. Zhao, W. Li, Q.D. Qin, more

Materials Science & Engineering A > 2006 > 430 > 1-2 > 142-150

An Al–Si coating was successfully produced by means of the low oxygen pressure fusing technology for improving the oxidation resistance of Ti–6Al–4V alloy. The Al and Si concentration in coating and coating thickness could be controlled by adjusting powder mixing ratio and changing the technical parameters (fusing temperature and time), respectively. At 1273K, the weight gain of the Al–20Si coating...

article

Study of the variant selection in sharp textured regions of bimodal IMI 834 billet

M. Humbert, L. Germain, N. Gey, P. Bocher, more

Materials Science & Engineering A > 2006 > 430 > 1-2 > 157-164

The bimodal microstructure of a IMI 834 billet was studied. It presents sharp textured regions called macrozones in which the main texture component of α _s colonies of hcp symmetry, inherited from β grains of bcc structure is such as the c axes coincide with those of the α _p grains characterised by one single texture component. This feature is the result of a variant selection. Analysis...

article

Structure and hot-rolled reinforcement rods properties evolution in the process of long service life

V.R. Mikryukov, A.P. Syomin, S.V. Konovalov, Yu.F. Ivanov, more

Materials Science & Engineering A > 2006 > 430 > 1-2 > 125-131

The physical nature of mechanical properties of hot-rolled reinforcement rods degradation during long-life operation is established by methods of transmission diffraction electron microscopy. It is shown that strength and plasticity properties decrease is due to cementite plates cutting and dissolution, microcracks formation process as a result of interstitial phase inclusions creation in the near-surface...

Volume:
430
Year:
2006

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Keywords

OXIDATION (4)
COMPOSITES (3)
MICROSTRUCTURE (3)
GRAIN BOUNDARY (2)
MECHANICAL PROPERTIES (2)
NANOINDENTATION (2)
SOL–GEL (2)
TEXTURE (2)
X-RAY DIFFRACTION (2)
316L STAINLESS STEEL (1)
AAO TEMPLATE (1)
ABNORMAL GRAIN GROWTH (1)
ACUTE CHANNEL ANGLE (1)
AGCU/TI POWDER MIXTURE (1)
AL ALLOY (1)
AL-7075 ALLOY (1)
ALUMINIUM ALLOYS (1)
AREA-SCALE FRACTAL ANALYSIS (1)
ATOMIC FORCE MICROSCOPE (1)
AZ31 MAGNESIUM ALLOY (1)
BANANA FIBER (1)
BRAZED CBN GRINDING WHEELS (1)
BRAZING MECHANISM (1)
CARBON ANODE (1)
CARBON FIBERS (1)
CARBON NANOTUBE (1)
CARBON/CARBON COMPOSITES (1)
CATALYTIC (1)
CEMENTED TUNGSTEN CARBIDE (1)
CERAMIC MATRIX COMPOSITES (1)
CERAMICS (1)
CHARPY IMPACT ENERGY (1)
CHEMICAL SYNTHESIS (1)
CO (1)
COATINGS (1)
COAXIAL NANOCOMPOSITES (1)
COMPOSITION (1)
COOLING PLATE (1)
CORNER GAP (1)
CREEP (1)
CROSS SHEAR ROLLING (1)
CRYOGENIC MILLING (1)
CRYOMILLING (1)
CRYSTAL GROWTH (1)
CU (1)
CU–AL–BE (1)
CVN–KIC CORRELATION (1)
DAMAGE (1)
DELAMINATION (1)
DENTAL RESTORATION (1)
DEWAXING (1)
DIFFUSION (1)
DISPERSOID (1)
DYNAMIC RECRYSTALLIZATION (1)
EBSD (1)
ELECTRODEPOSITION (1)
EQUAL CHANNEL ANGULAR PRESSING (1)
EQUAL CHANNEL ANGULAR PRESSING (ECAP) (1)
EQUAL-CHANNEL ANGULAR PRESSING (ECAP) (1)
EXCIPIENT MECHANICAL PROPERTIES (1)
FATIGUE FRACTURE SURFACE (1)
FE (1)
FE2O3 (1)
FERRITIC STEELS (1)
FE–CR–SI–B–MN SYSTEM (1)
FINITE ELEMENT ANALYSIS (1)
FINITE ELEMENT MODELING (1)
FLOW-SOFTENING (1)
FRACTURE TOUGHNESS (1)
FREE VOLUME (1)
FRICTION AND WEAR BEHAVIORS (1)
FUSING COATING (1)
GRAIN REFINING (1)
GRAPHITIZATION (1)
HARDNESS (1)
HARDNESS TEST (1)
HIGH VELOCITY OXY-FUEL (HVOF) THERMAL SPRAY (1)
HIGH-ENERGY MILLING (1)
HIGH-INTENSITY ULTRASOUND (1)
HIGH-SPEED MACHINING (1)
HOMOGENEITY (1)
HOT CORROSION (1)
HVOF (1)
HVOF COATINGS (1)
IMPULSE EXCITATION TECHNIQUE (1)
INDENTATION ANALYSIS (1)
INHOMOGENEOUS DEFORMATION (1)
INTERDIFFUSION (1)
INTERFACE (1)
INTERFACIAL MICROSTRUCTURE (1)
INTERFACIAL RIGID LINES (1)
KINETICS AND MECHANISM (1)
LASER DRILLING (1)
LASER PROCESSING (1)
LIMN2O4 (1)
LITHIUM ION BATTERY (1)
LITHIUM-ION BATTERY (1)
LOW CYCLE FATIGUE (1)
MACROZONES (1)
MAGNESIUM ALLOYS (1)
more

INFONA - science communication portal

Materials Science and Engineering: A

Stress-induced non-equilibrium grain boundary segregation of phosphorus in a Cr–Mo low alloy steel

Nanoindentation and nanomachining characteristics of gold and platinum thin films

Phase relations, lattice thermal expansion in Ce1−xEuxO2−x/2 and Ce1−xSmxO2−x/2 systems and stabilization of cubic RE2O3 (RE: Eu, Sm)

Differentiation of the surface topographies of pharmaceutical excipient compacts

Effects of lower cobalt binder concentrations in sintering of tungsten carbide

Morphological and structural characterisation of electrodeposited Zn–Mn alloys from acidic chloride bath

The development of superplastic ductilities and microstructural homogeneity in a magnesium ZK60 alloy processed by ECAP

Synthesis of MoSi2–Al2O3 nanocomposite by mechanical alloying

Microstructure and grain refining performance of Al–5Ti–1B master alloy prepared under high-intensity ultrasound

Microstructural characterization of precipitates in Cu–10wt.%Al–0.8wt.%Be shape-memory alloy

Influence of the green density on the dewaxing behaviour of uniaxially pressed powder compacts

Author index of volume 430

Nanostructure in a Ti alloy processed using a cryomilling technique

Editorial Board

Experimental validation of FE predicted fracture behaviour in thermally sprayed coatings

Research on low cycle fatigue properties of TA15 titanium alloy based on reliability theory

Microstructural characterization of Al-7075-T651 chips and work pieces produced by high-speed machining

Al–Si coating fused by Al+Si powders formed on Ti–6Al–4V alloy and its oxidation resistance

Study of the variant selection in sharp textured regions of bimodal IMI 834 billet

Structure and hot-rolled reinforcement rods properties evolution in the process of long service life

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