Mechanical alloying and subsequent heat treatment of Ag-Zn powders

作     者：Danny GUZMN Oscar RIVERA Claudio AGUILAR Stella ORDOEZ Carola MARTíNEZ Daniel SERAFINI Paula ROJAS 

作者机构：Department of MetallurgyAtacama University and CRIDESAT485 Copayapu AvenueCopiapóChile Department of MetallurgyAtacama University485 Copayapu AvenueCopiapóChile Department of Metallurgical and Materials EngineeringFederico Santa María Technical University1680 Espaa AvenueValparaísoChile Department of Metallurgical EngineeringSantiago of Chile University3363 Bernardo O'Higgins AvenueSantiagoChile Department of PhysicsSantiago of Chile University3363 Bernardo O'Higgins AvenueSantiagoChile School of Mechanical EngineeringPontifical Catholic University of Valparaíso01567 Los Carreras AvenueQuilpuéChile 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2013年第23卷第7期

页      面：2071-2078页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金："Fondo Nacional Desarrollo Científico y Tecnológico de Chile" FONDECYT project No11100284 

主　　题：mechanical alloying Zn-Ag alloys phase transformation heat treatment 

摘      要：Microstructural evolution during mechanical alloying of Ag and Zn, and subsequent heat treatments were investigated. The mechanical alloying was carried out in a SPEX 8000D miller. The microstructural characterization was obtained by X-ray diffraction （XRD）, transmission electron microscopy （TEM） and scanning electron microscopy （SEM）. The thermal behavior was studied using differential scanning calorimetry （DSC）. Based on the results obtained, it can be concluded that at the early stages of milling was possible to detect the ε, β, β′, α solid solutions and remaining Zn. Later, the ε, β, β′ and Zn phases disappeared while the Zn concentration of the α solid solution was strongly increased. After 7.2 ks of milling, the mechanical alloying process reached a steady state. During this period, both the composition and crystallite size of the α solid solution remained practically unchanged. On the other hand, subsequent heat treatments of milled powders showed that the α solid solution could also be obtained by the combination of mechanical alloying and heat treatment. Finally, the evolution of the microstructure during milling and annealing was combined to propose an optimal processing route in order to obtain a α solid solution.