【摘 要】
：
According to the Gibbs free energy difference between liquid and crystal, a thermodynamic glass-forming ability(GFA) parameter related to characteristic tempera
【机 构】
：
Engineering Research Center of Dredging Technology of Ministry of Education,School of Materials Scie
论文部分内容阅读
According to the Gibbs free energy difference between liquid and crystal, a thermodynamic glass-forming ability(GFA) parameter related to characteristic temperatures, onset crystallization temperature(T_x) and liquidus temperature(T_l), was proposed for evaluating the GFA of bulk metallic glasses(BMGs). The new parameter defined as ω=T_l(T_l+T_x)/(T_x(T_l-T_x)) has good correlation with the critical section thickness(Zc) of Ca-Mg-Cu BMGs. Being verified by the glasses data, including oxide glasses, which were used to validate the former GFA parameters, ω is one of the most reliable and applicable GFA parameters among Trg (=T_g/T_l), γ(=T_x/(T_l+T_g)), α (=T_x/T_l), δ (=T_x/(_Tl-T_g), and so on. Finally, predicting GFA of Cu-Ag-Zr-Ti and Cu-Zr-Ti-Al BMGs using ω was compared with the experimental results.
其他文献
Complex loading paths were realized with cruciform specimens and biaxial loading testing machine. Experimental method for determining the subsequent yield locus
To protect carbon materials from oxidation, SiC coatings were prepared on carbon/carbon(C/C) composites and graphite by chemical vapor reaction. SEM and XRD ana
Porous preforms were fabricated by cold-pressing process using powder mixture of TiC, TiO_2 and dextrin. After pyrolysis and sintering, Al melt was infiltrated
Polycrystalline La_(1-x)Na_xFeO_3 (0.0≤x≤0.3) solid solutions were synthesized by a solution combustion method using glycine as a fuel. The combustion synthes
In order to synthesize the targeting drug carrier system, magnetic chitosan-5-fluorouracil nano-particles were prepared by using 5-fluorouracil (5-Fu) as model
15% (volume fraction) SiC_p/8009Al metal matrix composites(MMCs) prepared by spray co-deposition were hot-extruded and rolled to investigate the effects of poro
X-ray diffractometry(XRD), optical microscopy(OM), scanning electron microscopy(SEM) were used to study the fatigue fracture of the T7451 Al-Zn-Mg-Cu alloy (470
Portevin-Le Chatelier (PLC) effect in a severely cold-rolled Al-Zn-Mg-Cu-Zr aluminum alloy (AA7055 type) plate before and after annealing was investigated. The
High purity titanium was prepared by thermal decomposition of titanium iodide. The feasible synthetic route and optimum decompositon temperaure were obtained by
The Al_2O_3-SiO_2(sf) (volume fraction, 20%)/Al-12.6Si metal matrix composites(MMCs) with or without rare earth Pr addition were fabricated by infiltration sque