Phase Transformation and Morphology Evolution of Ti50Cu25Ni20Sn5 during Mechanical Milling

Czél, Györgyné and Kristály, Ferenc and Mikó, Tamás and Rácz, Ádám and Kissné Svéda, Mária and Sycheva, Anna (2018) Phase Transformation and Morphology Evolution of Ti50Cu25Ni20Sn5 during Mechanical Milling. Materials, 11 (9). ISSN 1996-1944


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Nanocrystalline/amorphous powder was produced by ball milling of Ti50Cu25Ni20Sn5 (at.%) master alloy. Both laser diffraction particle size analyzer and scanning electron microscope (SEM) were used to monitor the changes in the particle size as well as in the shape of particles as a function of milling time. During ball milling, the average particle size decreased with milling time from >320 mu m to similar to 38 mu m after 180 min of milling. The deformation-induced hardening and phase transformation caused the hardness value to increase from 506 to 779 HV. X-ray diffraction (XRD) analysis was used to observe the changes in the phases/amorphous content as a function of milling time. The amount of amorphous fraction increased continuously until 120 min milling (36 wt % amorphous content). The interval of crystallite size was between 1 and 10 nm after 180 min of milling with 25 wt % amorphous fractions. Cubic Cu(Ni,Cu)Ti-2 structure was transformed into the orthorhombic structure owing to the shear/stress, dislocations, and Cu substitution during the milling process.

Item Type: Article
Uncontrolled Keywords: Microstructure; NI; ALLOYS; BULK METALLIC-GLASS; SUPERCOOLED LIQUID REGION; Ball milling; Powder Metallurgy; amorphous-nanocrystalline composites; Ti-based amorphous alloys;
Subjects: Q Science / természettudomány > QC Physics / fizika
Q Science / természettudomány > QE Geology / földtudományok
Depositing User: MTMT SWORD
Date Deposited: 10 Jan 2019 14:55
Last Modified: 10 Jan 2019 14:55

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