Effect of Growth Rate on Coarsening of Secondary Dendrite Arm Spacings in Directionally Solidified of Al-8.8La-1.2Ni Ternary Alloy

• Autorzy: Üstün Erkan , Çadirli Emin

Identyfikatory

DOI

10.24425/amm.2022.139685

• Języki publikacji: EN

Abstrakty

EN

One of the most important factors directly affecting microstructure and mechanical properties in directional solidification process is secondary dendrite arm spacing (SDAS). It is very important to measure the SDAS and examine the factors that may affect them. To investigate the effect of growth rate on the SDAS, the alloy specimens were directional solidified upward with different growth rates (V = 8.3-83.0 μm/s) at a constant temperature gradient (G = 4 K/mm) in a Bridgman-type growth apparatus. After the specimens are directionally solidified, they were exposed to metallographic processes in order to observe the dendritic solidification structure on the longitudinal section of the specimens. Coarsen secondary dendrite arm spacings (λ_2C) were measured excluding the first arms near the tip of the dendrite. Local solidification times ( t_f) were calculated by ratio of spacings to growth rates. It was determined that the t_f values decreased with increasing V values. The relationships between t_f and λ_2C were defined by means of the binary regression analysis. Exponent values of t_f were obtained as 0.37, 0.43, 0.46 and 0.47 according to increasing V values, respectively. These exponent values are close to the exponent value (0.33) predicted by the Rappaz-Boettinger theoretical model and good agreement with the exponent values (0.33-0.50) obtained by other experimental studies.

Słowa kluczowe

EN

directional solidification; Al-La-Ni ternary alloys; coarsening; secondary dendrite arm spacing

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2022
• Tom: Vol. 67, iss. 3
• Strony: 931--938
• Opis fizyczny: Bibliogr. 49 poz., fot., rys., tab., wzory

Twórcy

autor

Üstün Erkan

• Niğde Ömer Halisdemir University, Institute of Science, Department of Physics, Niğde, Turkey

autor

Çadirli Emin

• Niğde Ömer Halisdemir University, Institute of Science, Department of Physics, Niğde, Turkey

• https://orcid.org/0000-0002-8085-9733

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).