Phase Stability in Mechanically Alloyed Mg–Ni System Studied by Experiments and Thermodynamic Calculations
作者： Mohammad Hossein Enayati , Fathallah Karimzadeh , Soheil Sabooni , Majid Jafari , None
DOI: 10.1007/S40195-015-0287-8
关键词: Alloy 、 Intermetallic 、 Powder mixture 、 Metallurgy 、 Gibbs free energy 、 Materials science 、 Analytical chemistry 、 Amorphous solid 、 Nanocrystalline material 、 Phase (matter) 、 Solid solution
摘要: In this study, microstructural evolution of Mg–Ni alloy during mechanical alloying (MA) was investigated. Also, a thermodynamic approach utilized to predict the most stable phases formed in after MA. The phase composition and properties were assessed by X-ray diffractometry, high-resolution field emission scanning electron microscopy transmission microscopy. results showed that ball milling magnesium nickel powder mixture for 70 h yields nanostructural Mg2Ni compound with an average grain size ~20 nm. Thermodynamic calculations revealed in ranges 0.0 < X Mg < 0.03 (at.%) 0.97 < X Mg < 1, there is no driving force amorphous formation. range 0.07 < X Mg < 0.93, change Gibbs free energy formation more negative than solid solution. While X Mg = 0.66 (nominal intermetallic phase), found be both solution indicating phase, agreement experimental observations.
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