A new thermodynamic parameter to predict glass forming ability in iron based multi-component systems containing zirconium

Ramakrishna Rao, B. ; Srinivas, M. ; Shah, A. K. ; Gandhi, A. S. ; Murty, B. S. (2013) A new thermodynamic parameter to predict glass forming ability in iron based multi-component systems containing zirconium Intermetallics, 35 . pp. 73-81. ISSN 0966-9795

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.intermet.2012.11.020

Abstract

A new thermodynamic parameter PHSS (PHSS = ΔHC(ΔSσ/kB)(ΔSC/R)) is proposed, to describe and predict the Glass Forming Ability (GFA) of Fe based alloys. Here ΔHC is the chemical enthalpy of mixing, ΔSσ is the mismatch entropy and ΔSC is the configurational entropy. The PHSS parameter incorporates enthalpy of mixing, size mismatch and the number of elements in the systems which influence GFA significantly. It was observed from Rapid Solidification Processing (RSP) and Mechanical Alloying (MA) studies that, all alloys with PHSS in between −0.55 kJ/mol to −6.00 kJ/mol would form glass in the Fe–Zr–B system. MA and RSP experiments on multi-component Fe–Cr–Ni–Zr–B alloys indicated that PHSS is a better parameter to predict GFA of the system than PHS, a parameter used in earlier studies. It was also observed that Bulk Metallic Glass (BMG) forming alloys can be observed in between a PHSS range of −3.00 kJ/mol to −6.00 kJ/mol, with the maximum thickness of the BMG increasing with decreasing PHSS within the above range.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:B. Glasses, Metallic; C. Mechanical Alloying and Milling; C. Rapid Solidification Processing
ID Code:110903
Deposited On:06 Dec 2017 11:03
Last Modified:06 Dec 2017 11:03

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