Abstract
Ultrafine-grained (UFG) polycrystals are very attractive subjects for both theoretical and experimental research due to their unusual physical and mechanical properties. In recent years much attention has been paid to UFG polycrystals produced by heavy plastic deformation techniques, which allow one to obtain poreless materials with a grain size of about 0.1--0.2 {micro}m. A large number of investigations have been done in copper. Heavily deformed (HD) copper with UFG structure exhibits a high value of the yield stress and microhardness, and a softening of elastic moduli. However, annealing at temperatures of about 150--200 C for 20--60 min considerably increases the grain size, reduces the yield stress and microhardness, and increases the elastic constants. In the present communication the effect of annealing on the yield stress and Young`s modulus in HD Cu and precipitate hardened Cu:ZrO{sub 2} composite with UFG structure is reported. Good thermostability of the yield stress for HD Cu:ZrO{sub 2} within a temperature range 20--500 C is demonstrated.
Published Version
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