Open AccessFormation and composition optimization of Cu-based bulk metallic glasses in Cu-Zr-Ti ternary system
Author(s) -
Q. Wang,
J. B. Qiang,
Y. M. Wang,
Junhai Xia,
Zong-Sian Lin,
X. F. Zhang,
Chaofang Dong
Publication year - 2006
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.55.378
Subject(s) - materials science , amorphous metal , alloy , ternary operation , composition (language) , casting , crystallization , copper , metal , glass transition , analytical chemistry (journal) , chemical composition , metallurgy , chemical engineering , thermodynamics , composite material , linguistics , philosophy , chemistry , physics , chromatography , computer science , programming language , polymer , engineering
The present paper investigates the formation and composition characteristics of Cu-based bulk metallic glasses (BMGs) in the inter-transition metal system Cu-Zr-Ti by using an “e/a-variant criterion” which is relevant to clusters. Three such composition lines, (Cu9/13Zr4/13)100-xTix, (Cu.618Zr.382)-xTix and (Cu.56Zr.4)100-xTix, are defined in the Cu-Zr-Ti system. Among them, CuZr4, Cu61.Zr38.2 and Cu56Zr44 are specific Cu-Zr binary cluster compositions. Alloy compositions are designed along these three composition lines, and alloy rods with diameter of 3mm are prepared by copper mould casting. X-ray and TEM analysis show that BMGs are formed within Ti content range of x=7.5%—15%, x=7.5%—12.5% and x=5%—12% respectively along these three lines. Thermal analysis results further indicate that these BMGs have igher thermodynamic Tg,Tx,Tg/Tl and γ values, and these values of BMGs on every composition line decrease with increasing Ti content. The optimum BMG composition in this system is Cu64Zr28.Ti7.5 on the (Cu/13Zr4/13)00-xTix series, which also has the highest hardness and activation energy of crystallization. The characteristic parameters of this BMG are Tg736K, Tx769K, Tg/Tl=0.627,γ=0.403, Hν= 6.74GPa and ΔE=3.88 eV, which are all superior to those of the reported BMG Cu6Zr3Ti.