Microstructure

Iron-based bulk metallic glasses

“…All these have been possible by processing materials through different non-equilibrium processing techniques such as rapid solidification processing, mechanical alloying, plasma processing, spray forming, laser processing and different types of vapour deposition methods. 2 Several 'new' and advanced materials have also been developed during the last few decades, which include metallic glasses in thin ribbon form, [3][4][5] bulk metallic glasses, 6,7 quasicrystals, 8,9 high-temperature superconductors, superhard carbonitrides, thin-film diamond materials and nanostructured materials. [10][11][12][13] Metallic glasses are one such class of materials that display interesting combination of properties and have found applications in a variety of industries.…”

“…[10][11][12][13] Metallic glasses are one such class of materials that display interesting combination of properties and have found applications in a variety of industries. [3][4][5][6][7] The first synthesis of a metallic glass was achieved in 1960 by rapidly solidifying a metallic liquid of Au-25 at-%Si composition at cooling rates of y10 6 K s 21 . 14 Since then a very large number of alloy compositions in different alloy systems were synthesised in the glassy state.…”

“…Intensive developments during the last 20 years have resulted in the synthesis of metallic glasses with large section thickness or diameter, known as bulk metallic glasses (BMGs). 6,7 The observation of the stable phenomenon of supercooled liquid in metallic alloys made it possible to produce glassy alloys in a bulk form with diameters up to y72 mm. 6,7,[21][22][23][24] Pioneering work has been done at the Tohoku University in Sendai, Japan and at the California Institute of Technology in Pasadena, California, USA, in this field of study.…”

“…6,7 The observation of the stable phenomenon of supercooled liquid in metallic alloys made it possible to produce glassy alloys in a bulk form with diameters up to y72 mm. 6,7,[21][22][23][24] Pioneering work has been done at the Tohoku University in Sendai, Japan and at the California Institute of Technology in Pasadena, California, USA, in this field of study. Research investigations in this field are now being taken up in many other laboratories around the world, notably in China, Korea and India.…”

“…51,52 The general features of BMGs have been described in some reviews and books. 6,7,[22][23][24] Among the BMG alloys, Fe-based bulk glassy alloys are very attractive because of their excellent soft magnetic properties with rather high saturation magnetisation, high electrical resistivity, high mechanical strength and low materials cost, among others. 53 Ever since the first Fe-based bulk glassy alloy was synthesised in the Fe-Al-Ga-P-C-B system in 1995 by a coppermould casting technique, 27 a very large number of Febased BMGs including Fe-, Fe-Co-, Fe-Ni-and Fe-Co-Ni-based alloy systems have been developed to date.…”