Study of thermal and structural characteristics of mechanically milled nanostructured Al-Cu-Fe quasicrystals

Ali, Rashid and Akhtar, Muhammad Umair and Zahoor, Aqib and Ali, Fahad and Scudino, Sergio and Shahid, Rub Nawaz and Tariq, Naeem ul Haq and Srivastava, V C and Uhlenwinkel, V and Hasan, B A and Eckert, J (2020) Study of thermal and structural characteristics of mechanically milled nanostructured Al-Cu-Fe quasicrystals. Materials Chemistry and Physics, 251 (IF-3.408). p. 123071.

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Single phase nanostructured Al-Cu-Fe quascrystalline powders, with various grain sizes, were synthesized by low intensity mechanical milling of spray deposited icosahedral quasicrystals. Structural evolution as a function of temperature was studied in-situ using high energy synchrotron X-ray diffraction. Coefficient of thermal expansion was calculated using the change in d-spacing. The diffraction results revealed a change in the lattice parameter, grain size and quasi-lattice strain with increasing temperature. During heating, onset of appreciable grain growth in different nanostructured quascrystalline powders was observed at a certain critical temperature, which was closely related with the milling time. Quasicrystalline powders milled for 1 and 80 h exhibited appreciable grain coarsening at 923 and 573 K, respectively. For all the samples, the activation energy for grain growth (E-gg) was similar to 30-35 kJ/mol. In addition, the beta Al(Cu,Fe) phase with B2-type structure evolved during heating of powder samples milled for 10 h. Onset temperature for beta phase formation showed an inverse relationship with the milling time.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Quasicrystal; In-situ synchrotron X-ray diffraction; Nanostructured; Thermal behavior; Mechanical milling
Divisions:Metal Extraction and Forming
Material Science and Technology
ID Code:8211
Deposited By:Dr. A K Sahu
Deposited On:03 Aug 2020 12:38
Last Modified:03 Aug 2020 12:38
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