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Solid State Amorphization Reaction by Rod-Milling Al_xTa_<1-x> Powders and the Effect of Annealing

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High thermal stable amorphous Al_xTa_<1-x> alloy powders with wide amorphization range (10≤x≤90) have been synthesized by rod-milling technique using a mechanical alloying (MA) method. During the first few kiloseconds (11-173 ks) of the MA time, the layered-composite particles of Al and Ta are intermixed and form an amorphous phase upon heating at about 680 K in a differential thermal analyzer by thermally assisted solid state amorphization (TASSA). The heat formation of an amorphous Al_xTa_<1-x> alloy via the TASSA process, ΔH_<aT> has been measured as a function of the MA time. The crystallization characteristics indexed by the crystallization temperature, T_<xT> and the enthalpy of crystallization, ΔH_<xT> of the amorphous phase formed via the TASSA process are also investigated as a function of the MA time. Comparable with the TASSA process, a homogeneous amorphous Al_xTa_<1-x> alloy is formed after longer MA time (1080 ks). The amorphization process in this case is attributed to a mechanical solid state amorphization (MDSSA). At the end of the MA time (1080-1440 ks), the maximum heat of formation of an amorphous Al_xTa_<1-x> alloy via the MDSSA process, ΔH_<aM>, has been calculated. Moreover, the thermal stability characterized by the crystallization temperature, T_<xM> and the enthalpy of crystallization, ΔH_<xM>, are also estimated. The role of amorphization via each process has been discussed.

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