Mechanism of phase transformations in Mg-based alloys subjected to plasma immersion ion implantation of Ag

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• 作者：Larisa Kutsenko ; David Fuks ; Arnold Kiv ; Michael Talianker ; Ljubov Burlaka ; Othon Monteiro and Ian Brown
• 关键词：Magnesium alloy ; Implantation ; Transmission electron microscopy ; Ab initio calculations
• 刊名：Acta Materialia
• 出版年：2006
• 出版时间：June 2006
• 年：2006
• 卷：54
• 期：10
• 页码：2637-2643
• 全文大小：334 K

文摘

The formation of a new phase of composition Mg₅₄Al₂₈Ag₁₈ was observed as a result of plasma immersion ion implantation of Ag into the compound Mg₁₇Al₁₂. The new structure was characterized using a micro-beam diffraction technique. It was found that the implantation-induced phase transition occurs when the retained dose of the implanted ions is within the range of about 10¹⁵–10¹⁶ ions/cm². The implanted system has been studied theoretically by means of density-functional electronic structure calculations and a new ab initio approach has been developed to evaluate the specific concentrations of the implanted ions that might cause the phase transition effect in the implanted matrix. The theoretically estimated values of concentrations are in good agreement with experimental observations.