Abstract
(Cu43Zr48Al9)98Y2 amorphous alloy bar was prepared by the arc melting copper mold absorption casting method, and then, the amorphous alloy was annealed at different temperatures for different times. The influence of heating rate on thermal expansion and thermal stability was studied by thermomechanical analysis (TMA), and the microstructure evolution of the amorphous alloy during structural relaxation and crystallization was studied by XRD and TEM. Results show that the structural evolution behavior of the (Cu43Zr48Al9)98Y2 amorphous alloy can be divided into five different stages (structural relaxation preparation stage, structural relaxation stage, first crystallization stage, second crystallization stage, and grain growth stage). When the heating rate is 20 K/min, the amorphous alloy has the smallest thermal expansion coefficient and the best thermal stability. The width of the supercooled liquid region is 66.42 K. Samples with different relaxation states were prepared by annealing at the heating rate of 20 K/min. The structural evolution of amorphous alloys with different relaxation states is as follows: amorphous → CuZr2 + AlCu2Zr7 → CuZr2 + AlCu2Zr7 + CuZr(B2) + CuZr(M) + Cu10Zr7 → CuZr2 + AlCu2Zr7 + CuZr(B2) + CuZr(M). After annealing at 706 K and 726 K (in the supercooled liquid region) for 1.5 h, the amorphous-nanocrystalline composites were obtained. When the annealing temperature is 706 K, the crystallization process of the sample is as follows: amorphous → Cu10Zr7 → Cu10Zr7 + CuZr, and for the sample at 726 K, it is as follows: amorphous → CuZr2 + AlCu2Zr7 + Cu10Zr7 → Cu10Zr7 + CuZr2 → CuZr2 + CuZr (B2) + Cu10Zr7.
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References
Wang You, Jiang Stephen, Wang Meidong, et al. Abrasive wear characteristics of plasma sprayed nanostructured alumina/titania coatings. Wear, 2000, 237(2): 176–185.
Botta W J, Berger J E, Kiminami C S, et al. Corrosion resistance of Fe-based amorphous alloys. Journal of Alloys and Compounds, 2014, 586(2): 105–110.
Duan G, Wiest A, Lind M L, et al. Lightweight Ti-based bulk metallic glasses excluding late transition metals. Scripta Materialia, 2008, 58: 465–468.
Park J M, Kim Y C, Kim W T, et al. Ti-Based Bulk Metallic Glasses with High Specific Strength. Materials Transactions, 2004, 45: 595–598.
Kim Y C, Kim W T, Kim D H. A development of Ti-based bulk metallic glass. Materials Science and Engineering: A, 2004, 375–377: 127–135.
Mei J N, Soubeyroux J L, Blandin J J, et al. Nanocrystallization-induced large room-temperature compressive plastic strain of Ti40Zr25Ni8Cu9Be18BMG. Journal of Alloys and Compounds, 2011, 509: 1626–1629.
Zhang Y, Zhao D Q, Wang R J, et al. Formation and properties of Zr48Nb8Cu14Ni12Be18 bulk metallic glass. Acta Materialia, 2003, 51: 1971–1979.
Wang W H. The nature and characteristics of amorphous materials. Progress in Physics, 2013, 33(05): 177–351. (In Chinese)
Wu L J, Zhu Z W, Liu D M, et al. Deformation behavior of a TiZr-based metallic glass composite containing dendrites in the supercooled liquid region. Journal of Materials Science and Technology, 2020, 37: 64–70.
Shen Y, Perepezko J H. Al-based amorphous alloys: Glass-forming ability, crystallization behavior and effects of minor alloying additions. Journal of Alloys and Compounds, 2016, 707: 3–11.
Huang X Q, Xu H, Tan X H, et al. Crystallization and magnetic properties in Fe72−xNd7B21Nbx (x=0–4.0) bulk alloys. Rare Metal Materials and Engineering, 2018, 47 (01): 214–218. (In Chinese)
Komatsu T, Takeuchi M, Matusita K, et al. Study of structural relaxation of Ni78Si8B14 metallic glass by electrical resistivity and thermal expansion measurements. Journal of Non-Crystalline Solids, 1983, 57: 129–136.
Pradeep K G, Herzer G P, et al. Atom probe tomography study of ultrahigh nanocrystallization rates in FeSiNbBCu soft magnetic amorphous alloys on rapid annealing. Acta Materialia, 2014, 68: 295–309.
Mei J N, Soubeyroux J L, Blandin J J, et al. Structural relaxation of Ti40Zr25Ni8Cu9Be18 bulk metallic glass. Journal of Non-Crystalline Solids, 2011, 357(1): 110–115.
Yang Y Z, Li X F, Qiu Z H, et al. Influences of Isothermal Heat Treatment on the Microstructure and Compression Properties of Zr57Cu15.4Ni12.6Al10Nb5 Bulk Amorphous Alloy. Rare Metal Materials and Engineering, 2006, 8: 1254–1257. (In Chinese)
Yuan X P, Zhen S Z, Zhao Y C, et al. Crystallization behavior of Cu46Zr44Al5Nb5 bulk amorphous alloy. Rare Metals, 2013, 37(05): 738–743. (In Chinese)
Cao Chengcheng, Fan Juewen, Zhu Li, et al. Effects of relaxation time on local structural and magnetic properties of Fe80.8B10P8Cu12 amorphous. Acta Physica Sinica, 2017, 66(16): 259–266. (In Chinese)
Chen Q J, Wang J, Shen J, et al. Thermal expansion characteristics and thermal conductivity of FeCo-based bulk amorphous alloys. Rare Metal Materials and Engineering, 2016, 45(03): 765–770. (In Chinese)
Guan H, Kou H C, Wang J, et al. Study on structural transformation behavior of a Ti-Based bulk metallic glass by thermal expansion method. Rare Metal Materials and Engineering, 2014, 43(5): 1047–1050.
Luborsky F E, Ke C, Tang Y S, et al. Amorphous Metallic Alloy. Beijing: Metallurgical Industry Press, 1989: 133.
Porscha B, Neuhäuser H. Combined measurements of modulus and length and their correlation for different amorphous alloys. Scripta Metallurgica et Materialia, 1995, 32: 931–936.
Wang Z Y, He J, Yang B J, et al. Liquid-liquid phase separation and formation of two glassy phases in Zr-Ce-Co-Cu immiscible alloys. Acta Metallurgica Sinica, 2016, 52(11): 1379–1387. (In Chinese)
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This work was financially supported by the Principal Fund of Xi’an Technological University, China (Grant No. 0852-302021407).
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Xin-hui Fan Male, Ph.D, Professor. Research interest: amorphous alloys. He has been the leader of one National Natural Science Foundation and three projects in the General Armament Department, China, has been awarded 6 provincial and ministerial level science and technology awards, and holds 5 invention patents. To date, he has published more than 60 academic papers.
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Zhao, Jb., Fan, Xh., Li, B. et al. Microstructure and thermal expansion of copper-based amorphous alloys during structural relaxation. China Foundry 17, 8–14 (2020). https://doi.org/10.1007/s41230-020-9099-1
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DOI: https://doi.org/10.1007/s41230-020-9099-1
Key words
- amorphous-nanocrystalline composite materials
- structural relaxation
- microstructure
- thermal expansion
- thermal stability