JOM
Investment casting has emerged as one of the most direct and desirable routes from liquid metal to parts of amazing complexity. Metallurgical developments since the late 1980s have enabled the design and manufacture of components used in static- and dynamic-loaded components. Foundry-process parameters used for such applications have been traditionally optimized with respect to static properties and...
The separation of antimony and bismuth in copper electrorefining is somewhat difficult and costly. An ion-exchange technique for the removal of the metals from the electrolyte has been practiced recently, although the metals recovered require further processing. Sumitomo Metal Mining has developed a process to recover antimony and bismuth directly from the eluant by an electrowinning process using...
Accurate predictions of microstructure and microsegregation in metallic alloys are highly important for applications such as process optimization and alloy development. This article gives an overview of the methods developed during the past 30 years for solidification simulation on a microscopic scale, with a special emphasis on multicomponent alloys. Analytical approaches as well as advanced numerical...
In the past four years, a new process has been developed at McGill University for the immobilization of arsenic from metallurgical effluents and flue dusts by the controlled precipitation of scorodite under atmospheric-pressure conditions. So far, the process has been successfully tested in the laboratory with chloride and sulfate solutions containing arsenic and with As2O3 smelter flue dusts. It...
Through the last three decades, improvements and modifications at Onahama Smelting and Refining Company’s tankhouse and stripper section have resulted in reduced labor and maintenance costs, more effective blank handling, stabilized operation in the stripper, and increased copper productivity. This article recounts some significant technological developments toward the attainment of these results.
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P.R. Subramanian is a senior scientist at UES and is the advisor to JOM from the TMS Alloy Phases Committee of the Electronic, Magnetic & Photonic Materials Division and the Structural Materials Division.
This article presents an overview of the discrete atom method and recent findings concerning general coherency problems. Continuum linear elasticity on coherence strain is also reviewed along the framework of Eshelby’s inclusion theory.
Recent progress in variational methods helps to provide general principles for microstructural evolution. Especially when several processes are interacting, such general principles are useful to formulate dynamical equations and to specify rules for evolution processes. Variational methods provide new insight and apply even under conditions of nonlinearity, nondifferentiability, and extreme anisotropy...
Enormous progress has been made in the calculation of phase diagrams during the past 30 years. This progress will continue as model descriptions are improved and computational technology advances. Improvement has been made in the model descriptions in the CALPHAD method, the coupling of phase diagrams with kinetic process modeling, computer programs for easy access to phase diagram information, and...
Gecamines is a large mining company in Congo and has been one of the world’s leading cobalt producers for many years, having some of the richest cobalt deposits in the world. This article summarizes cobalt production and process flow-sheet data at the company’s Shituru plant in Congo. As much as 300 tonnes of cobalt alloy with 5–20% nickel content has been produced monthly at the plant through an...