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The Influence of Strontium on Porosity Formation in Al-Si Alloys
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Strontium modification is known to alter the amount, characteristics, and distribution of porosity in Al-Si castings. Although many theories have been proposed to account for these effects, most can be considered inadequate because of their failure to resolve contradictions and discrepancies in the literature. In an attempt to critically appraise some of these theories, the amount, distribution, and morphology of porosity were examined in sand-cast plates of Sr-free and Sr-containing pure Al,...
Related newspaper, magazine, and journal articles from HighBeam Research
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Steel with high strength and toughness.(TECH SPOTLIGHT)
Advanced Materials & Processes
; Ultimate tensile strength of a new medium carbon martensitic steel alloy ranges from 280 to 325 ksi (1932 to 2242 MPa); yield strength is 220 to 260 ksi (1520 to 1794 MPa); elongation is 11 to 16%; and Charpy V-notch impact toughness ranges from 23 to 36 ft-lb (31 to 48 J). Mechanical properties
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Preparing Aluminum for Finishing.(bibliography included)
Products Finishing
; When aluminum is exposed to air, a surface oxide forms that protects the metal in many environments. Unfortunately, the natural oxide is not uniform and localized corrosion can occur. Also, the oxide is not stable at low or high pH. Its solubility at elevated pH creates problems under paint.
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Preparing Aluminum for Painting.
Products Finishing
; When aluminum is exposed to air, a surface oxide forms that protects the metal in many environments. Unfortunately, the natural oxide is not uniform and localized corrosion can occur. Also, the oxide is not stable at low or high pH. Solubility at elevated pH creates problems under paint.
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Mathematical modeling of aluminum evaporation during electron-beam cold-hearth melting of Ti-6AI-4V ingots
Metallurgical and Materials Transactions
; A mathematical model was developed to describe the kinetics of aluminum evaporation during the electron-beam cold-hearth melting of titanium alloys. The analysis treated the diffusion of aluminum to the surface of the melt, chemical reaction between the melt and vapor phases at the surface, and the
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Effect of Y, Sr, and Nd Additions on the Microstructure and Microfracture Mechanism of Squeeze-Cast AZ91-X Magnesium Alloys
Metallurgical and Materials Transactions
; This study aims to investigate the effects of Y, Sr, and Nd additions on the microstructure and microfracture mechanism of the four squeeze-cast magnesium alloys based on the commercial AZ91 alloy. Microstructural observation, in situ fracture tests, and fractographic observation were conducted on
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Effects of Alloying Elements on Microstructure, Hardness, and Fracture Toughness of Centrifugally Cast High-Speed Steel Rolls
Metallurgical and Materials Transactions
; A study was made of the effects of alloying elements on the microstructure, hardness, and fracture toughness of centrifugally cast high-speed steel (HSS) rolls. Particular emphasis was placed on the role of hard carbides located along solidification cell boundaries and the type of the tempered
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NICKEL ALLOYS Meet Corrosion Challenges.
Advanced Materials & Processes
; D.C. Agarwal Nickel and nickel alloys have useful resistance to a wide variety of corrosive environments encountered in various industrial processes. This report is based on a paper presented at the NACE Corrosion 2001 conference in March in Houston, Texas. The latter half of the 20th century saw
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Nickel-base alloys combat corrosion.
Advanced Materials & Processes
; Nickel-base alloys with a range of alloying elements have been developed to resist corrosion in aqueous and harsh chemical environments. The modern chemical process industry must increase production efficiency to remain competitive. Manufacturers typically meet this challenge by utilizing higher
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Kinetic Transitions and Substititional Solute (Mn) Fields Associated with Later Stages of Ferrite Growth in Fe-C-Mn-Si
Metallurgical and Materials Transactions
; A low-carbon alloy steel with relatively high Mn and Si concentrations (0.04 wt pet C-3 wt pet Mn-1.9 wt pet Si) has been used to explore the effects of alloy chemistry and austenite grain size on ferrite growth. Even at high levels of supersaturation, the volume fraction of ferrite is found to
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Exo-Melt: a commercially viable process. (alloying process)(includes related article)
Advanced Materials & Processes
; Nickel and iron aluminides are new classes of advanced materials that exhibit excellent oxidation resistance up to 1100 [degrees] C (2000 [degrees] F). They offer unique properties because of their ordered crystal structure and high aluminum content. Their ordered structure, unlike the disordered
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