Results 251 to 260 of about 49,081 (299)

Ductile-to-brittle transition in spallation of metallic glasses

Journal of Applied Physics, 2014
In this paper, the spallation behavior of a binary metallic glass Cu50Zr50 is investigated with molecular dynamics simulations. With increasing the impact velocity, micro-voids induced by tensile pulses become smaller and more concentrated. The phenomenon suggests a ductile-to-brittle transition during the spallation process.
X. Huang, Z. Ling, L. H. Dai
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Comparison of ductile-to-brittle transition curve fitting approaches

International Journal of Pressure Vessels and Piping, 2012
Abstract Ductile-to-brittle transition (DBT) curve fitting approaches are compared over the transition temperature range for reactor pressure vessel steels with different kinds of data, including Charpy-V notch impact energy data and fracture toughness data.
Cao, LW, Wu, SJ, Flewitt, PEJ
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A dislocation dynamical theory of the ductile-to-brittle transition

Acta Metallurgica et Materialia, 1995
A mesoscopic dislocation dynamics approach is used to describe subcritical crack growth due to transgranular cleavage of semi-brittle materials. From an analysis of the concurrent effects of (i) crack tip dislocation emission, (ii) crack shielding and (iii) propagation of the plastic zone into unyielded material which is applied to a crack loaded in ...
P. Hähner, H. Stamm
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Notch Ductile-to-Brittle Transition Due to Localized Inelastic Band

Journal of Engineering Materials and Technology, 1993
Holes are often drilled in a panel for cooling or fastening. For a panel made of a monolithic ceramic, such a hole concentrates stress, reducing load-carrying capacity of the panel by a factor of 3. By contrast, for a ductile alloy panel, plastic flow relieves stress concentration so that the small hole does not reduce load-carrying capacity.
Z. Suo, S. Ho, X. Gong
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On the ductile to brittle transition in austenitic steel

Materials Science and Engineering: A, 1997
The fracture mode of austenitic steel may feature a ductile to brittle transition (DBT), depending on alloy composition and temperature. As crack nucleators, intersecting deformation twins play a key role in determining the fracture mode. In particular, brittle fracture occurs at low temperature deformation of high nitrogen steel where twins are very ...
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On the ductile-to-brittle transition temperature in MoSi2

Scripta Metallurgica et Materialia, 1992
This paper reports that the intermetallic compound MoSi[sub 2] combines excellent oxidation resistance, a high melting point (2020[degrees]C), reasonable strength and density, and good thermal conductivity, making it a promising material for structural applications above 1200[degrees]C.
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Ductile-to-Brittle transition in 〈111〉 hadfield steel single crystals

Russian Metallurgy (Metally), 2010
The deformation mechanism and the character of fracture of 〈111〉 austenitic Hadfield steel single crystals are studied during tension in the temperature range 77–673 K by scanning and transmission electron microscopy. It is found that a change in the fracture mechanism from ductile to brittle fracture according to the fractography criterion takes place
E. G. Astafurova, Yu. I. Chumlyakov
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Ductile to brittle transition in the Zr41.2Ti13.75Cu12.5Ni10Be22.5 bulk metallic glass

Intermetallics, 2006
Abstract The variation of impact toughness, Γ, of a Zr41.2Ti13.75Cu12.5Ni10Be22.5 (Vitreloy-1) bulk metallic glass (BMG) within the temperature range of 123–423 K was evaluated by using an instrumented Charpy impact testing machine, in order to examine if the BMGs exhibit ductile-to-brittle transition (DBT) that is seen in rapidly quenched glasses ...
R. Raghavan, P. Murali, U. Ramamurty
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Ductile-To-Brittle Transition Time in Polyethylene Geomembrane Sheet

1990
The susceptibility of polyethylene (PE) geomembranes to stress cracking was evaluated in the laboratory using an accelerated notched constant load testing (NCLT) method. The test specimens were subjected to various stress levels which ranged from 25% to 70% of the yield stress at 50°C.
YH Halse, AE Lord, RM Koerner
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Thermal activation analysis of ductile to brittle transition of polypropylene

International Journal of Fracture, 1996
A fracture test of polypropylene is carried out by changing the loading rate at several constant temperatures. The purpose is to display the transition caused by the loading rate at different temperatures. Arrhenius law will be adopted in the analysis and a quantitative relationship which can describe the transition will be obtained after this ...
Liu Yongning, Song Xiaolong
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