Ali, F and Scudino, S and Gorantla, S M and Srivastava, V C and Shahid, H R and Uhlenwinkel, V and Stoica, M and Vaughan, G and Mukhopadhyay, N K and Eckert, J (2013) Mechanically driven phase transformation in single phase Al 62.5 Cu 25 Fe 12.5 quasi-crystals: Eﬀect of milling intensity. Acta Materialia, 61 (IF-3.94). pp. 3819-3830.
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In this work the eﬀect of mechanical milling on the structure, thermal stability and hardness of single phase Al 62.5 Cu 25 Fe 12.5 icosa-hedral quasi-crystals has been investigated for diﬀerent milling intensities. The results indicate that, irrespective of the milling intensity used, the quasi-crystals transform to a body-centered cubic (bcc) phase during milling. This transformation starts when the grain size of the QC phase is about 10 nm, which represents the critical grain size initiating the phase transformation. Upon heating the milled powder displays grain growth of the bcc phase at low temperatures, followed by transformation to the original icosahedral QC phase at higher temperatures. The phase transformations occurring during milling and subsequent annealing have a remarkable eﬀect on the indentation hardness, which can be tuned within a wide range (7–10 GPa) as a function of the volume fractions of the diﬀerent phases. This suggests that a composite material with optimized mechanical properties can be produced by appropriate thermo-mechanical treatments.
|Uncontrolled Keywords:||Mechanical milling; Quasi-crystals; Phase transformation; Hardness|
|Divisions:||Metal Extraction and Forming|
|Deposited By:||Dr. V.C. Srivastava|
|Deposited On:||08 Jul 2013 09:59|
|Last Modified:||26 Dec 2013 16:46|
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