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Interparticle movement and the mechanical behavior of extruded powder aluminum at elevated temperature

Description: This paper proposes a model and mechanism, based on relative motion of the extruded aluminum particles, to explain these effects. Quantitative stereology is used to support the concept. Stress-strain relations are derived for the uniaxial and biaxial behavior of powder aluminum and they are seen to fit the data from a number of uniaxial and tension-torsion test specimens. Implications of the model for forming of extruded powder metal products are discussed
Date: September 1, 1996
Creator: Peacock, H.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Key microstructures controlling the mechanical properties of two-phase TiAl alloys with lamellar structures

Description: TiAl alloys with the base composition of Ti-47Al-2Cr-2Nb (at.%) were prepared by arc melting and drop casting, followed by hot extrusion above the {alpha}-transus temperature, T{sub {alpha}}. The hot extruded materials were then heat treated above and below T{sub {alpha}} in order to control microstructural features in these lamellar structures. Mechanical properties of these alloys were determined by tensile testing at temperatures to 1000 C. Tensile elongation at room temperature (RT) is stro… more
Date: December 31, 1996
Creator: Liu, C. T.; Maziasz, P. J. & Wright, J. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An inverse problem by boundary element method

Description: Boundary Element Methods (BEM) have been established as useful and powerful tools in a wide range of engineering applications, e.g. Brebbia et al. In this paper, we report a particular three dimensional implementation of a direct boundary integral equation (BIE) formulation and its application to numerical simulations of practical polymer processing operations. In particular, we will focus on the application of the present boundary element technology to simulate an inverse problem in plastics p… more
Date: February 1, 1996
Creator: Tran-Cong, T.; Nguyen-Thien, T. & Graham, A. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Mechanical properties of four RSP stainless steel alloys

Description: Four austenitic stainless steel alloys were processed by consolidating rapidly solidified gas atomized power using hot extrusion. These materials were characterized by measuring grain growth, hardness, tensile properties from 24 to 800{degrees}C, and creep-rupture at 600{degrees}C.
Date: December 1, 1996
Creator: Korth, G.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Extrusion of tritium and D-T pellets for ITER fueling

Description: As part of the International Thermonuclear Engineering Reactor (ITER) plasma fueling development program, Oak Ridge National Laboratory (ORNL) has fabricated a pellet injection system to test the mechanical and thermal properties of extruded tritium. This repeating, single-stage, pneumatic injector, called the Tritium-Proof-of-Principle Phase II (TPOP-II) Pellet Injector, has a piston-driven mechanical extruder and is designed to extrude and accelerate hydrogenic pellets sized for the ITER devi… more
Date: July 1, 1996
Creator: Fisher, P. W.; Gouge, M. J. & Denny, B. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Oxidation Behavior of ODS Iron Aluminides

Description: Oxide-dispersed Fe-28at.%Al-2%Cr alloys were produced by a powder metallurgy technique followed by hot extrusion. A variety of stable oxides were added to the base alloy to assess the effect of these dopants on the oxidation behavior at 1200{degrees}C in air and O{sub 2}. An Al{sub 2}O{sub 3} dispersion flattened the {alpha}-Al{sub 2}O{sub 3} scale, but produced none of the other reactive element effects and had an adverse influence on the long-term oxidation behavior. A Y{sub 2}O{sub 3} disper… more
Date: May 1, 1996
Creator: Pint, B. A.; Tortorelli, P. F. & Wright, I. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Diffusive mesh relaxation in ALE finite element numerical simulations

Description: The theory for a diffusive mesh relaxation algorithm is developed for use in three-dimensional Arbitary Lagrange/Eulerian (ALE) finite element simulation techniques. This mesh relaxer is derived by a variational principle for an unstructured 3D grid using finite elements, and incorporates hourglass controls in the numerical implementation. The diffusive coefficients are based on the geometric properties of the existing mesh, and are chosen so as to allow for a smooth grid that retains the gener… more
Date: June 1, 1996
Creator: Dube, Eveline I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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