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Thermally Stable Nanocrystalline Aluminum Alloys Processed by Mechanical Alloying and High Frequency Induction Heat Sintering

Authors: Hany R. Ammar, Khalil A. Khalil, El-Sayed M. Sherif

Abstract:

The current study investigated the influence of milling time and ball-to-powder (BPR) weight ratio on the microstructural constituents and mechanical properties of bulk nanocrystalline Al; Al-10%Cu; and Al-10%Cu-5%Ti alloys. Powder consolidation was carried out using a high frequency induction heat sintering where the processed metal powders were sintered into a dense and strong bulk material. The powders and the bulk samples were characterized using XRD and FEGSEM techniques. The mechanical properties were evaluated at various temperatures of 25°C, 100°C, 200°C, 300°C and 400°C to study the thermal stability of the processed alloys. The processed bulk nanocrystalline alloys displayed extremely high hardness values even at elevated temperatures. The Al-10%Cu-5%Ti alloy displayed the highest hardness values at room and elevated temperatures which are related to the presence of Ti-containing phases such as Al3Ti and AlCu2Ti. These phases are thermally stable and retain the high hardness values at elevated temperatures up to 400ºC.

Keywords: Nanocrystalline Aluminum Alloys, Mechanical Alloying, Sintering, Hardness, Thermal Stability.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1099242

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References:


[1] C.C. Koch, “Intermetallic matrix composites prepared by mechanical alloying - a review,” Materials Science and Engineering, Vol. A244, 1998, pp. 39-48.
[2] H.D.K.H, “Mechanically alloyed metals,” Materials Science and Technology, Vol. 1, 2000, pp. 1404-1411.
[3] M.A. Shaikh, M. Iqbal, J.I. Akhter, M. Ahmad, Q. Zaman, M. Akhtar, M.J. Moughal, Z. Ahmed, and M. Farooque, “Alloying of immiscible Ge with Al by ball milling,” Materials Letters, Vol. 57, 2003, pp. 3681- 3685.
[4] E. Ma and M. Atzmon, “Phase transformations induced by mechanical alloying in a binary system,” Materials Chemistry and Physics, Vol. 39, 1995, pp. 249-267.
[5] C.C. Koch and J.D. Whittenberger, “Review: mechanical milling/alloying of Intermetallic,” Intermetallics, Vol. 4, 1996, pp. 339- 355.
[6] C. Suryanarayana, “Mechanical alloying and milling,” Progress in Materials Science, Vol. 46, 2001, pp. 1-184.
[7] Kwang-Min Lee and In-Hyung Moon, “High temperature performance of dispersion-strengthened A1-Ti alloys prepared by mechanical alloying,” Materials Science and Engineering, Vol. A 185, 1994, pp. 165-170.
[8] R. Lerf and D. G. Morris, “Mechanical alloying of Al-Ti alloys,” Materials Science and Engineering, Vol. A 128, 1990, pp. 119-127.
[9] L. Shaw, H. Luo, J. Villegas and D. Miracle, “Thermal stability of nanostructured Al93Fe3Cr2Ti2 alloys prepared via mechanical alloying,” Acta Materialia, Vol. 51, 2003, pp. 2647–2663.
[10] T.T. Sasaki, T. Ohkubo and K. Hono, “Microstructure and mechanical properties of bulk nanocrystalline Al-Fe alloy processed by mechanical alloying and spark plasma sintering,” Acta Materialia, Vol. 57, 2009, pp. 3529-3538.
[11] T.T. Sasaki, T. Mukai and K. Hono, “A high-strength bulk nanocrystalline Al-Fe alloy processed by mechanical alloying and spark plasma sintering,” Scripta Materialia, Vol. 57, 2007, pp. 189-192.
[12] M. Krasnowski and T. Kulik,“Nanocrystalline and amorphous Al-Fe alloys containing 60-85% of Al synthesized by mechanical alloying and phase transformations induced by heating of milling products,” Materials Chemistry and Physics, Vol. 116, 2009, pp. 631-637.
[13] K.I. Moon and K.S. Lee, ”Compressive deformation behavior of nanocrystalline Al-5at.% Ti alloys prepared by reactive ball milling in H and ultra-high-pressure hot pressing,” Journal of Alloys and Compounds, Vol. 333, 2002, pp. 249–259.
[14] K.I. Moon and K.S. Lee, “Development of nanocrystalline Al-Ti alloy powders by reactive ball milling,” Journal of Alloys and Compounds, Vol. 264, 1998, pp. 258–266.
[15] ASM Handbook Vol. 2, “Properties and selection: nonferrous alloys and special-purpose materials,” ASM International, Materials Information Society, U.S.A., 1990