نتایج جستجو برای: microstructural evolution

تعداد نتایج: 353951  

Journal: :international journal of research in materials science 0
hossein yoozbashizadeh department of materials science and engineering, sharif university of technology, tehran, iran ali heidary moghadam department of materials science and engineering, tehran science and research branch, islamic azad university, tehran, iran valiollah dashtizad department of advanced materials and renewable energy, iranian research organization for science and technology, p.o. box13815-3538, tehran, iran ali kaflou department of advanced materials and renewable energy, iranian research organization for science and technology, p.o. box13815-3538, tehran, iran

the effect of rare earth (re) elements, including ce and la, on the sorption properties of zr-co getters was investigated in this work. the phase evolution, microstructural characteristics of getter powders were studied by means of x-ray diffraction method, scanning electron microscopy (sem) and energy dispersive x-ray spectroscopy (eds). the nanostructured zr3co intermetallic compound has been...

Journal: :Materials Transactions, JIM 1998

2008
C. A. Martínez-Pérez M. García-Guaderrama

A comparative study was carried out for an alloy of Al50(Ni75Mo25)50 processed by two different high energy ball mills. A SPEX and Simoloyer mill were used. The milled products were characterized using X-Ray Diffraction and Scanning Electron Microscopy. A different morphology and microstructural evolution were found with each mill used. It was evident that prolonged milling time induced the for...

1998
P. C. Wang Y. C. Her J.-M. Yang

The fatigue behavior of the unnotched and notched silicon carbide fiber-reinforced titanium/titanium aluminide hybrid laminated composite was investigated at room temperature. The evolution of microstructural damage and its effect on stiffness and strength degradation was quantified as a function of loading cycles and applied stress levels. Fatigue crack propagation behavior and damage mechanis...

2001
Craig Carter Rajesh Raghavan

| Methods for and computed results of including the physics and spatial attributes of microstructures are presented for a number of materials applications in devices. The research in our group includes applications of computation of macroscopic response of material microstructures, the development of methods for calculating microstructural evolution, and the morphological stability of structure...

1999
D. D. J. Allman

Microstructural study of the C49-TiSi, to C54-TiSi, polymorphic transformation has been performed to elucidate microstructural evolution and possible mechanism of the phase transformation. It has been shown that the nucleation of the C54-TiSi, is heterogeneous, and preferentially takes place at triple grain junctions or grain boundaries. The interphase interfaces between C49 and C54 disilicides...

Journal: :Journal of Computational Physics 2000

2004
Zhihui Sun Guang Ye Thomas Voigt Surendra P. Shah Klaas van Breugel

In this paper, the correlation of reflection loss measured by an ultrasonic shear wave reflection method and the microstructure in cement-based material is investigated. Three cement pastes (Portland cement type I) with different water-cement ratios (0.35, 0.50 and 0.60) cured at 25 °C were examined. The ultrasonic shear wave reflection factor (WRF) was measured by the wave reflection technique...

2000
J. Chen P. Jung H. Trinkaus

Helium has a decisive effect on the microstructure of silicon carbide materials after implantation and subsequent annealing. A dense population of bubbles and dislocation loops is already observed at relatively low displacement doses after annealing of helium-implanted a-SiC, while no visible damage appears after irradiation without helium implantation under otherwise equal conditions. The defe...

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