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Enhanced Ductility in Al-Si-Cu-Mg Foundry Alloys with High Si Content
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It has recently been suggested that the β-Al^sub 5^FeSi and θ-Al^sub 2^Cu intermetallic particles are refined and dispersed in the presence of high silicon, thereby improving the ductility of Al-Si-Cu-Mg alloys. However, limited metallographic evidence was presented to support these claims. Therefore, a study of the effect of Si content in the range of 4.5 to 9 pct on the morphology and distribution of Fe-rich and Cu-rich intermetallic phases has now been conducted. It is shown that...
Related newspaper, magazine, and journal articles from HighBeam Research
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Genetic dissection of silicon content in different organs of rice.
Crop Science
; ABSTRACT Quantitative trait loci (QTLs) analysis for Si content in rice (Oryza saliva L.) was performed to study the inheritance of Si content in rice. A recombinant inbred line (RIL) population of 244 lines derived from the indica rice cross 'Zhenshan 97B' (ZS97BMilyang 46' (MY46) were grown in
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Polymer-core solder balls: an alternative to solid solder balls?(electronic packaging )
CircuiTree
; A report on exploratory work with polymer-core solder balls in electronic packaging applications. The results reveal insufficient reliability in thermal cycling tests but point to potential novel packaging solutions. Technology Drivers Today, area arrays are common electronic packages for COB (chip
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Mechanism and preventive measures for die soldering during al casting in a ferrous mold
JOM
; Research Summary This work provides a comprehensive understanding of the reactions at the ferrous die/molten metal interface in a metal mold casting operation. The literature has shown that several important factors influence reactions at the ferrous die/molten aluminum interface, including
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Die soldering: Mechanism of the interface reaction between molten aluminum alloy and tool steel
Metallurgical and Materials Transactions
; Die soldering is the result when molten aluminum sticks to the surface of the die material and remains there after the ejection of the part; it results in considerable economic and production losses in the casting industry, and is a major quality detractor. In order to alleviate or mitigate die
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The Stability of Al^sub 11^Sm^sub 3^ (Al^sub 4^Sm) Phases in the Al-Sm Binary System
Metallurgical and Materials Transactions
; The relative stability of Al^sub 11^Sm^sub 3^ (Al^sub 4^Sm) intermetallic phases was experimentally investigated through a series of heat treatments followed by microstructural, microchemical, and X-ray diffraction (XRD) analyses. The principal findings are that the high-temperature tetragonal
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Iron intermetallic phases in the Al corner of the Al-Si-Fe system
Metallurgical and Materials Transactions
; The iron intermetallics observed in six dilute Al-Si-Fe alloys were studied using thermal analysis, optical microscopy, and image, scanning electron microscopy/energy dispersive X-ray, and electron probe microanalysis/wavelength dispersive spectroscopy (EPMA/WDS) analyses. The alloys were
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Explore the potential of capacitor-discharge welding. (US Bureau of Mines designs new welding process)
Advanced Materials & Processes
; Capacitor-discharge welding (CDW) is a rapid-solidification joining process that the U.S. Bureau of Mines developed to create welds having nonequilibrium microstructures. CDW produces high-reliability joints with no intermetallic compounds that can make them brittle, or trapped gases that can make
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Mechanisms of Microstructure Evolution in an Austenitic Stainless Steel Bond Generated Using a Quaternary Braze Alloy
Metallurgical and Materials Transactions
; In typical braze joints, melting point depressants degrade the structural robustness by concentrating as brittle phases into continuous seams along the centerline. The objective of the present article is to sufficiently understand the mechanisms governing the microstructure of a typical braze so
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The nitriding behavior of Ti-Al alloys at 1000 (deg C)
Metallurgical and Materials Transactions
; The nitriding behavior of a series of alloys in the binary Ti-Al system has been determined at 1000 degC, under a controlled atmosphere of pure nitrogen gas, for times ranging between 7 and 100 hours. The scales and subscales were characterized by X-ray diffraction, scanning electron microscopy,
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Synthesis of ultrafine particles of intermetallic compounds by the vapor-phase magnesium reduction of chloride mixture: Part 1. Titanium aluminides
Metallurgical and Materials Transactions
; A new chemical synthesis process for the preparation of intermetallic compounds has been developed. It involves the vapor-phase reduction of mixtures of constituent metal chlorides by magnesium vapor to produce intermetallic compounds in the form of fine powder. The advantages of the process
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