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Anisotropy of structural and mechanical properties in CuCrZr alloy following hydrostatic extrusion process

Przybysz Sylwia, Kulczyk Mariusz, Skiba Jacek, Skorupska Monika

Bulletin of the Polish Academy of Sciences. Technical Sciences

2022

Vol. 70, nr 4

art. no. e141725

The methods of severe plastic deformation (SPD) of metals and metal alloys are very attractive due to the possibility of refinement of the grains to nanometric sizes, which facilitates obtaining high mechanical properties. This study investigated the influence of SPD in the process of hydrostatic extrusion (HE) on the anisotropy of the mechanical properties of the CuCrZr copper alloy. The method of HE leads to the formation of a characteristic microstructure in deformed materials, which can determine their potential applications. On the longitudinal sections of the extruded bars, a strong morphological texture is observed, manifested by elongated grains in the direction of extrusion. In the transverse direction, these grains are visible as equiaxed. The anisotropy of properties was mainly determined based on the analysis of the static mini-sample static tensile test and the dynamic impact test. The obtained results were correlated with microstructural observations. In the study, three different degrees of deformation were applied at the level necessary to refine the grain size to the ultrafine-grained level. Regardless of the applied degree of deformation, the effect of the formation of a strong morphological texture was demonstrated, as a result of which there is a clear difference between the mechanical properties depending on the test direction, both by the static and dynamic method. The obtained results allow for the identification of the characteristic structure formed during the HE process and the more effective use of the CuCrZr copper alloy in applications.

Elektrody do zgrzewania punkowego − kształtowanie i eksploatacja

Wendland J., Szkudelski Sz., Borowski J., Wisniewska-Weinert H.

Hutnik, Wiadomości Hutnicze

2014

Vol. 81, nr 8

608--615

Celem pracy było opracowanie technologii kształtowania plastycznego elektrod do punktowego zgrzewania oporowego. W pracy przedstawiono wyniki symulacji numerycznej procesu wyciskania elektrod oraz wyniki badań elektrod wyciśniętych, według opracowanej technologii, z komercyjnego stopu CuCrZr oraz materiału uzyskanego metodami dużych odkształceń plastycznych – poprzez wyciskanie hydrostatyczne oraz wyciskanie metodą KOBO.

The aim of the work was to develop technology of plastic forming of electrodes for resistance spot welding. The paper presents results of numerical simulation of the electrodes extrusion process and results of tests on extruded electrodes, by the developed technology, from commercial CuCrZr alloy and material obtained by methods of severe plastic deformation - by hydrostatic extrusion and KOBO extrusion method.

Effect of Heat Treatment and Hydrostatic Extrusion on Mechanical Properties of a CuCrZr Alloy

Zyśk B., Kulczyk M., Lewandowska M., Kurzydłowski K. J.

Archives of Metallurgy and Materials

2010

Vol. 55, iss. 1

143-149

In this work the effects of heat treatment and hydrostatic extrusion on mechanical properties of a CuCrZr alloy were investigated. The samples of CuCrZr alloy were subjected to solution annealing at a temperaturę of 1000°C for lh followed by water ąuenching. This was followed by aging at temperatures of 350, 450, 480, 550 and 650° C for the time raging from V2, to 3 hours. Two samples: (1) solution annealed and water ąuenched and (2) solution annealed, water ąuenched and aged at 480°C for 2 hours were subjected to the process of hydrostatic extrusion. The results obtained show that ageing increases the yield strength of the alloy by 500% whereas plastic deformation by hydrostatic extrusion by 1000%. The synergic effects of precipitation and deformation strengthening were also observed on samples subjected to ageing prior to or after hydrostatic extrusion. However, it is suggested that the two strengthening mechanisms are not fully additive.

W pracy badano wpływ obróbki cieplnej i wyciskania hydrostatycznego na właściwości mechaniczne stopu CuCrZr. Próbki ze stopu CuCrZr poddano przesycaniu z temperatury 1000°C w wodzie. Następnie były one starzone w temperaturze 350, 450, 480, 550 i 650°C w czasie od 1/2 do 3 godzin. Dwie próbki: (1) przesycana i (2) starzona w temperaturze 480°C przez 2 godziny zostały poddane procesowi wyciskania hydrostatycznego. Uzyskane wyniki wskazują, że starzenie powoduje wzrost plastyczności stopu o 500%, podczas gdy po odkształceniu plastycznym metodą wyciskania hydrostatycznego wzrasta o 1000%. Synergiczny efekt umocnienia wydzieleniowego i odkształceniowego zaobserwowano w próbkach poddanych starzeniu zarówno przed jak i po wyciskaniu hydrostatycznym. Uzyskane wyniki wskazują jednak, że obydwa mechanizmy umocnienia nie są w pełni addytywne.