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Title:
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Thermal stability of ultrafine grains size of pure copper obtained by equal-channel angular pressing
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Author:
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Lugo Chacón, Nayar Adolfo; Llorca, N.; Suñol Martinez, Juan Jose; Cabrera Marrero, José M.
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. PROCOMAME - Processos de Conformació de Materials Metàl·lics |
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Abstract:
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Ultrafine grain of pure copper 99.98% was
produced by severe plastic deformation using the equalchannel angular pressing (ECAP) method. Copper samples were ECAPed from 1 to 8 passes following route BC; fine grain sizes of 250 nm were developed after eight passes.
Important enhancement in the mechanical strength properties was obtained. Subsequent heat treatments (HT) were carried out to evaluate the thermal stability of the grains of the ECAPed samples. Microstructure and mechanical properties were evaluated to determine the recovery and recrystallization temperatures. Differential scanning calorimetry (DSC) tests were conducted to all samples in order to determinate these temperatures. The activation energy of
the recrystallization process was also determined by the DSC technique and good correlation was obtained with the
microstructure and mechanical properties. An important decrease in the mechanical properties and an increasing
heterogeneous grain size distribution were observed when heat treatments were performed. |
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Abstract:
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Peer Reviewed |
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Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials
-Materials--Thermal properties
-Materials- Propietats tèrmiques |
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Rights:
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Document type:
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Article - Published version
Article |
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