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Article
Slip System Modification in NiAl
An effort to modify the slip vector in the B2 compound NiAl was undertaken to overcome the brittle failure associated with the <100> slip vector which typically operates in this compound. Alloying additions we...
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Article
Fatigue and Fracture Behavior of a Ca-Based Bulk-Metallic Glass
The compression and fatigue behavior of a Ca65Mg15Zn20 bulk-metallic glass (BMG) was studied in air at room temperature. During the preparation of cubical samples of the Ca65Mg15Zn20 for compression and fatigue i...
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Article
Effect of Al Addition on Glass Forming Ability and Glass Stability of Ca-Mg-Zn-Cu Based Bulk Metallic Glasses
The effect of Al addition on glass forming ability (GFA) and stability of the glassy phase against crystallization was studied for Ca-Mg-Zn, Ca-Mg-Cu, and Ca-Mg-Zn-Cu alloys. The glassy alloys were produced by...
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Article
Open AccessDevelopment and Characterization of Low-Density Ca-Based Bulk Metallic Glasses: An Overview
Ca-based bulk metallic glasses (BMGs) have unique properties and represent a new seventh group of BMGs. Many of them have excellent GFA, which can be related to their efficient atomic packing, low onset drivin...
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Article
Cryogenic and elevated temperature strengths of an Al−Zn−Mg−Cu alloy modified with Sc and Zr
The effect of minor additions of Sc and Zr on tensile properties of two developmental Al−Zn−Mg−Cu alloys was studied in the temperature range −196°C to 300°C. Due to the presence of Sc and Zr in a fine dispers...
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Article
Electrochemical behavior of Ca-based bulk metallic glasses
Since 2002, numerous Ca-based bulk metallic glass (BMG) alloys have been discovered. These BMG alloys are of interest because of their low densities and costs; however, few studies have examined the properties...
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Article
A Thermodynamic Model for Amorphization and Topological Criteria
A thermodynamic model for amorphization is developed which allows analysis of the effect of composition, atomic radii, and elastic constants of constitutive elements on amorphization. The model is based on com...
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Article
Microstructural and mechanical characterization of carbon coatings on SiC fibers
A series of carbon coatings was deposited on a 1040 SiC monofilament using chemical vapor deposition, and failure of the fiber-matrix interfacial region under transverse tension was studied. Deposition substra...
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Article
Application of the cruciform specimen geometry to obtain transverse interface-property data in a high-fiber-volume-fraction SiC/Titanium alloy composite
A combined experimental and computational methodology was used to determine the relevant strength and residual-stress parameters in a manufactured, high-fiber-volume-fraction multiply metal matrix composite (M...
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Article
Deformation and fracture of a particle-reinforced aluminum alloy composite: Part I. Experiments
Mechanical tests were performed on a powder-metallurgically processed 7093/SiC/15p discontinuously reinforced aluminum (DRA) composite in different heat-treatment conditions, to determine the influence of matr...
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Article
Deformation and fracture of a particle-reinforced aluminum alloy composite: Part I. Experiments
Mechanical tests were performed on a powder-metallurgically processed 7093/SiC/15p discontinuously reinforced aluminum (DRA) composite in different heat-treatment conditions, to determine the influence of matr...
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Article
Part I. The microstructural evolution in Ti-Al-Nb O+Bcc orthorhombic alloys
Phase transformations and the resulting microstructural evolution of near-Ti2AlNb and Ti-12Al-38Nb O+bcc orthorhombic alloys were investigated. For the near-Ti2AlNb alloys, the processing temperatures were below ...
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Article
Part II. The creep behavior of Ti-Al-Nb O+bcc orthorhombic alloys
The intermediate-temperature (650 °C to 760 °C) creep behavior of orthorhombic (O)+bcc alloys containing 50 at. pct Ti was studied. Ti-25A1-25Nb, Ti-23Al-27Nb, and Ti-12Al-38Nb ingots were processed and heat t...
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Article
Transverse creep of SiC/Ti-6Al-4V fiber-reinforced metal matrix composites
The transverse creep response of an 8-ply SiC (SCS-6)/Ti-6Al-4V composite was measured at 482 °C from 69 to 276 MPa. Creep samples with fibers exposed at the edges as well as specimens with fully embedded fibe...
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Article
Effects of thickness and precracking on the fracture toughness of particle-reinforced al-alloy composites
The effect of specimen thickness on the fracture toughness of a powder metallurgically processed 7093 Al/SiC/15p composite was evaluated in different microstructural conditions. The fracture toughness in the unde...
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Article
Role of matrix microstructure on room-temperature tensile properties and fiber-strength utilization of an orthorhombic ti-alloy-based composite
Microstructure-property understanding obtained for a nominally Ti-25Al-17Nb (at. pct) monolithic sheet alloy was used to heat treat a unidirectional four-ply SCS-6/Ti-25Al-17Nb metal-matrix composite (MMC) and...
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Article
Interface Effects on the Tensile and Fatigue Crack Growth Behavior of Fiber-Reinforced Metal Matrix Composites
The effects of the interface on the tension and fatigue crack growth behavior of fiber-reinforced titanium matrix composites were studied using single-ply and single-fiber SiC/Ti-6Al-4V mini-composites with di...
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Article
The Fracture Behavior of SiCp/Aluminum Alloy Composites With And Without Large Al-Particles
JIc measurements were performed on a SiCp/Al-7093 MMC with controlled heat treatments, and the damage mechanisms were evaluated to understand the influence of microstructural parameters on the fracture toughness ...
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Article
Microstructure and mechanical behavior of Cr-Cr2Hfin situ intermetallic composites
A detailed investigation of the effects of microstructural changes on the mechanical behavior of twoin situ intermetallic composites with Cr and Cr2Hf phases in the Cr-Hf system was performed. The nominal composi...
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Article
Interface effects on the micromechanical response of a transversely loaded single fiber SCS-6/Ti-6Al-4V composite
The ability of a fiber-matrix interface to support a transverse load is typically evaluated in straight-sided composite specimens where a stress singularity exists at the free surface of the interface. This st...