On the go-and-stop motion of the discontinuous precipitation front

• Autorzy: Chronowski M. , Zięba P.

Identyfikatory

DOI

10.1007/s43452-020-00039-9

• Języki publikacji: EN

Abstrakty

EN

The growth of lamellar structure during discontinuous precipitation occurs frequently by so-called go-and-stop fashion. The results of simulation combined with the changes of Cahn’s parameter C revealed two types of such motion. The process takes place in the successive stages which can be distinguished judging from the value of C parameter. For lower values of linear growth rate (v = 10÷20 nm/s) and smaller α lamella thickness (100÷200 nm), the full cycle with relaxation takes 4–6 s. The faster movement of the reaction front (v = 30 nm/s) resulted in dramatic decrease of the full cycle to τtotal = 0.8 s. The same behavior is observed if the α lamella thickness increases beyond 200 nm at constant v equal to 10 nm/s. Both predicted types of go-and-stop motion can experimentally be observed during growth or dissolution of discontinuous precipitates. What is the reason that particular type prevails is unknown, and this is invitation for further studies especially using high-resolution transmission electron microscope operating in in situ mode.

Słowa kluczowe

EN

discontinuous precipitation; go-and-stop motion; simulation of grain boundary diffusion; Cahn’s parameter

PL

parametr Cahna; dyfuzja; opady

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2020
• Tom: Vol. 20, no. 2
• Strony: 73--79
• Opis fizyczny: Bibliogr. 17 poz., rys.

Twórcy

autor

Chronowski M.

• AGH-University of Science and Technology, Kraków, Poland

autor

Zięba P.

• Institute of Metallurgy and Materials Science, Polish Academy of Sciences, Reymonta St. 25, 30‑059 Kraków, Poland

Bibliografia

• [1] Abdou S, Solorzano GI, El-Boragy M, Gust W, Predel B. In-situ study of discontinuous precipitation in Al-15 at.% Zn. Scripta Mater. 1997;34:1431–6.
• [2] Bögel A, Gust W. A standardized model and a reaction principle for discontinuous precipitation. Z Metallkd. 1998;79:296–308.
• [3] Chongmo L, Hillert M. A metallographic study of diffusioninduced grain boundary migration in the Fe–Zn system. Acta Metall. 1981;29:1949–60.
• [4] Sulonen MS. Discontinuous mode of dissolution of a β phase precipitate into α Cu–Cd solid solutions. Acta Metall. 1960;8:669–76.
• [5] Tu KN, Turnbull DB. Morphology and kinetics of cellular dissolution of the Pb-Sn alloy. Metall Trans A. 1971;2:2509–15.
• [6] Hackney SA, Biancaniello FS. Directional invariance of grain boundary migration in the Pb-Sn cellular transformation and the Tu-Turnbull hysteresis. Scripta Metall. 1986;20:1417–22.
• [7] Chuang TH, Fournelle RA, Gust W, Predel B. Drei diskontinuierliche Festkörperreaktionen in einer a-Fe-13.5 At.% Zn-Legierung. Z Metallkd. 1989;80:318–26.
• [8] Pawłowski A, Zięba P. Mechanism of early stages of discontinuous dissolution in AlZn alloys. Mater Sci Eng, A. 1989;108:9–17.
• [9] Zięba P, Gust W. Local values of the diffusivities at the migration front of the discontinuous precipitates in Al-22 at.% Zn alloy. Scripta Mater. 1998;39:13–20.
• [10] Zięba P, Gust W. Microanalytical study of discontinuous precipitation and dissolution in Ni-4 at.% Sn: local and global characterization of the reactions. Acta Mater. 1999;47:2641–50.
• [11] Zięba P. Microanalytical study of the discontinuous precipitation in a Co-13 at.% Al alloy. Acta Mater. 1998;46:369–77.
• [12] Chung YH, Shin MC, Yoon DY. In situ observation of discontinuous precipitation in an Al-40 wt% (21.8 at.%) Zn alloy. In: Kim NJ, editor. Proceedings of the international symposium on light materials for transportation systems (LiMAT-93). Center for Advanced Aerospace Materials, Pohang University of Science and Technology; 1993. p. 371–6.
• [13] Cahn JW. The kinetics of cellular segregation reactions. Acta Metall. 1959;7:18–28.
• [14] Tashiro K, Purdy GR. In situ observations of chemically induced grain boundary migration and discontinuous precipitation in the aluminum–zinc system. Metall Trans A. 1989;20:1593–600.
• [15] Zięba P. In situ study of discontinuous precipitation and dissolution in an Al-22 at% Zn alloy. Z Metallkd. 1999;90:669–74.
• [16] Solorzano IG, Purdy GR, Wheatherly GC. Studies of the initiation, growth and dissolution of the discontinuous precipitation product in aluminum-zinc alloys. Acta Metall. 1984;31:1709–17.
• [17] Klinger L, Brechet Y, Duly D. On the influence of non-steady state velocity on interlamellae concentration profiles in discontinuous precipitation. Scripta Mater. 1997;37:1237–42.

Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021)