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Cu/Ti base multicomponent amorphous Cu 47 Ti 33 Zr 11 Ni 8 Si 1 and nanocrystalline silver composites
Author(s) -
Dutkiewicz Jan,
LityńskaDobrzyńska Lidia,
Rogal Łukasz,
Maziarz Wojciech,
Czeppe Tomasz
Publication year - 2010
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200983352
Subject(s) - materials science , nanocrystalline material , amorphous solid , differential scanning calorimetry , ball mill , amorphous metal , composite material , intermetallic , crystallization , transmission electron microscopy , metallurgy , indentation hardness , alloy , microstructure , chemical engineering , crystallography , nanotechnology , chemistry , physics , engineering , thermodynamics
Abstract An easy glass‐forming alloy based on Cu–Ti of composition Cu 47 Ti 33 Zr 11 Ni 8 Si 1 was ball milled for 40 h to obtain amorphous powder. X‐ray diffraction and differential scanning calorimetry (DSC) measurements confirmed the dominant presence of the amorphous phase after ball milling. However, transmission electron microscopy from powders allowed identification of Si particles and intermetallic phases a few nanometre in diameter, often of CuNi 2 Ti or Cu–Ti structures. The powder was then hot pressed in vacuum at temperature of 460 °C between the glass transition and the crystallization point to form bulk amorphous samples. Composites were prepared in the same way from mixed milled amorphous powders and nanocrystalline silver powder prepared by ball milling. Various ratios of amorphous to silver powder were applied with a maximum of 60% of nanocrystalline silver The microhardness of the amorphous phase component was near 1100 HV, much higher than the 90 HV of silver. Composites containing 20% of nanosilver have shown a much higher compression strength of 850 MPa, as compared to the 450 MPa of the composite containing 60% of silver, however, the latter has better ductility, near 5%, before fracture.