Effect of γ phase content on martensitic transformation and mechanical properties in Co–Ni–Al shape memory alloys

• Autorzy: Maziarz Wojciech

Identyfikatory

DOI

10.15199/28.2019.4.1

Warianty tytułu

PL

Wpływ zawartości fazy γ na przemianę martenzytyczną i właściwości mechaniczne w stopach z pamięcią kształtu z układu Co–Ni–Al

• Języki publikacji: EN

Abstrakty

EN

The effect of γ phase content on the martensitic transformation and mechanical properties of Co–Ni–Al alloys was investigated. For nine Co–Ni–Al alloys with different chemical composition corresponding to the e/a ratio from 7.9 to 7.55, a quantitative microstructure investigations as well as tensile tests have been performed. The alloys were induction melted, casted, homogenized, plastically deformed by hot rolling with thickness reduction of 90% and finally again annealed and water quenched (solution treated). Quantitative image analyse of microstructure after homogenization allowed to determine the γ content from 14 to 39% for alloys containing from 25 to 30 at. % Al respectively, while further hot rolling and solution treatment caused reduction of γ phase content from 6 to 23%. Linear relationships between Ms temperature and e/a ratio was found for alloys with the e/a ratio from 7.9 to 7.72, in which the amount of γ phase increases slightly from 21 to 23%, and for composition where e/a decreases from 7.69 to 7.55 and γ phase content rises up from 6 to 12%. Tensile tests revealed that alloys with the highest γ phase content (about 20%) have the best mechanical properties; strength at the level of 1000 MPa combined with plasticity at the level of 18%.

PL

Celem pracy było określenie wpływu zawartości fazy γ w dwufazowych β + γ stopach z pamięcią kształtu z układu Co–Ni–Al po procesie walcowania na gorąco, a następnie przesycania z wysokiej temperatury (z zakresu jednofazowego β) na zakres przemiany martenzytycznej i właściwości mechaniczne tych stopów.

Słowa kluczowe

EN

Co–Ni–Al shape memory alloys; martensitic transformation; γ phase; mechanical properties

PL

stopy z pamięcią kształtu z układu Co–Ni–Al; przemiana martenzytyczna; faza γ; właściwości mechaniczne

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2019
• Tom: Vol. 40, nr 4
• Strony: 86--90
• Opis fizyczny: Bibliogr. 20 poz., fig., tab.

Twórcy

autor

Maziarz Wojciech

• Institute of Metallurgy and Materials Science, Polish Academy of Sciences, Kraków

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).