Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2018 - zeszyt 2

Microstructure characterization of ultrafine grained Cu alloys processed by methods with cyclic scheme of deformation

Charakterystyka mikrostruktury ultradrobnoziarnistych stopów miedzi otrzymywanych metodami cyklicznej deformacji

10.15199/28.2018.2.1

Kinga Rodak

nr katalogowy: 113382
10.15199/28.2018.2.1

Streszczenie

COT (compression with oscillatory torsion) is a simple process that has the ability to deform bulk metallic samples. Performed investigations show that this method of deformation leads to grain refinement of Cu-Cr and Cu-Fe alloys. The grain size obtained via the dislocation subdivision mechanism associated with generation of non-equilibrum grain boundaries is in the UFG range. Large fraction of grain boundaries have low angles of misorientation. The limitation of the grain refinement and creation of low angles boundaries can be attributed to the extensive dynamic recovery. However, recrystallization process and deformation twinning plays a crucial role in grain refinement resulting in grain refinement to the nanoscale. The present overview shows that many structural elements accompanying formation UGF structure influence on understanding of the microstructure-properties relationship in these materials.

Abstract

Na przestrzeni ostatnich kilkudziesięciu lat problematyka odkształcania plastycznego metali i ich stopów z wykorzystaniem dużych odkształceń plastycznych SPD (Severe Plastic Deformation) stanowi ważny obszar badawczy inżynierii materiałowej. Procesy SPD umożliwiają rozdrobnienie ziarna metali i ich stopów do rozmiarów od 0,1 do około 0,5 mikrometrów, a otrzymana ultradrobnoziarnista struktura wykazuje atrakcyjne właściwości mechaniczne (wysokie właściwości wytrzymałościowe i odpowiednie właściwości plastyczne), a także fizyczne. Cechy i elementy strukturalne ultradrobnoziarnistych materiałów stanowią ważny czynnik decydujący o mechanicznych oraz funkcjonalnych właściwościach tych materiałów, a zależą one między innymi od: temperatury homologicznej materiału, składu chemicznego, wydzieleń faz wtórnych, wartości energii błędu ułożenia SFE (Stacking Fault Energy), a także drogi odkształcenia.

Słowa kluczowe

Keywords

Bibliografia

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