TY - JOUR
T1 - On the new criterion to assess the glass-forming ability of metallic alloys
AU - Long, Zhilin
AU - Xie, Guoqiang
AU - Wei, Hongqing
AU - Su, Xuping
AU - Peng, Jian
AU - Zhang, Ping
AU - Inoue, Akihisa
N1 - Funding Information:
This work was supported by the Planned Science and Technology Project of Hunan Province (No. 2008FJ3095) and National Natural Science Foundation of China (Nos. 50671088, 50771089).
PY - 2009/5/25
Y1 - 2009/5/25
N2 - Based on the analysis of time-temperature-transformation (TTT) diagrams of glass-forming liquids using the fragility concept, a dimensionless criterion ω, expressed by Tg/Tx - 2Tg/(Tg + Tl) (Tg the glass transition temperature, Tx the onset crystallization temperature and Tl the liquidus temperature), is proposed for quickly evaluating the glass-forming ability (GFA) of metallic glasses. From the available experimental data reported in the literature, the criterion ω exhibits the strongest correlation with the critical cooling rate Rc for glass formation among all currently available GFA indicators, including Trg(=Tg/Tl), ΔTx(=Tx - Tg), ΔTrg(=(Tx - Tg)/(Tl - Tg)), δ(=Tx/(Tl - Tg)), γ(=Tx/(Tg + Tl)), γm(=(2Tx - Tg)/Tl), φ(=Trg(ΔTx/Tg)0.143), α(=Tx/Tl), β(=Tx/Tg + Tg/Tl), β(=Tx × Tg/(Tl - Tx)2) and ζ(=Tg/Tl + ΔTx/Tx). An empirical equation is induced to elucidate the Rc in different metallic alloys based on the measured ω value of the corresponding alloy. It is also demonstrated that this ω criterion has a strong ability to measure or/and predict the GFA of cryoprotectants and oxide glasses, especially in the case of cryoprotectants.
AB - Based on the analysis of time-temperature-transformation (TTT) diagrams of glass-forming liquids using the fragility concept, a dimensionless criterion ω, expressed by Tg/Tx - 2Tg/(Tg + Tl) (Tg the glass transition temperature, Tx the onset crystallization temperature and Tl the liquidus temperature), is proposed for quickly evaluating the glass-forming ability (GFA) of metallic glasses. From the available experimental data reported in the literature, the criterion ω exhibits the strongest correlation with the critical cooling rate Rc for glass formation among all currently available GFA indicators, including Trg(=Tg/Tl), ΔTx(=Tx - Tg), ΔTrg(=(Tx - Tg)/(Tl - Tg)), δ(=Tx/(Tl - Tg)), γ(=Tx/(Tg + Tl)), γm(=(2Tx - Tg)/Tl), φ(=Trg(ΔTx/Tg)0.143), α(=Tx/Tl), β(=Tx/Tg + Tg/Tl), β(=Tx × Tg/(Tl - Tx)2) and ζ(=Tg/Tl + ΔTx/Tx). An empirical equation is induced to elucidate the Rc in different metallic alloys based on the measured ω value of the corresponding alloy. It is also demonstrated that this ω criterion has a strong ability to measure or/and predict the GFA of cryoprotectants and oxide glasses, especially in the case of cryoprotectants.
KW - Criterion
KW - Glass-forming ability
KW - Metallic glasses
KW - Thermal analysis
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U2 - 10.1016/j.msea.2009.01.063
DO - 10.1016/j.msea.2009.01.063
M3 - Article
AN - SCOPUS:64049109713
VL - 509
SP - 23
EP - 30
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
IS - 1-2
ER -