Simulation study of effects of Ti content on microstructure evolution and elastic constants of immiscible Mg-Ti alloys during rapid quenching process

• Published in: Materials letters Vol. 220; pp. 253 - 256
• Main Authors: Huang, Changxiong, Liu, Hairong, Liu, Rangsu, Xi, Tingfei, Wu, Boqiang, Mo, Yunfei, Zhang, Zhixiong, Tian, Zean, Liu, Wei
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.06.2018; Elsevier BV
• Subjects: Alloys; Clusters; Crystallization; Elastic constants; Elastic properties; Evolution; Immiscible Mg-Ti alloy; Materials science; Microstructure; Miscibility; Molecular chains; Molecular dynamics; Phase transformation; Quenching; Rapid quenching (metallurgy); Solidification; Titanium base alloys; Immiscible Mg-Ti alloy; Phase transformation; Elastic constants; Microstructure; Solidification
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2018.02.127

•A MD study for microstructure evolutions and elastic constants of Mg-Ti.•FCC, HCP and BCC clusters play key roles in liquid-solid transitions.•The crystallization temperature Tc is enhanced with increase of Ti content X.•The E and G values of Mg-Ti alloys with similar structure are close each other. As for immiscible Mg-Ti alloys, how the microstructures and properties change during rapid quenching, which would finally decide their functions, is of significance. Thus, microstructure evolutions and elastic constants of immiscible Mg100-XTiX (X = 1, 10, 20, 30, 40 and 50) alloys have been studied by molecular dynamics (MD) simulation. The Energy-Temperature (E-T) curves and Cluster Type Index Method (CTIM-2) are adopted to analyze the evolution of microstructures. Results show that the crystallization temperature Tc is enhanced with the increase of Ti content X. As the content X of Ti is at 1 and 10, the main structures in system are predominant fcc (12 0 0 0 12 0) coexisting with minor hcp (12 0 0 0 6 6) clusters, and whose values of E and G are both close to 40GPa and 16GPa, respectively. As X is in the range from 20 to 50, the main structures are bcc (14 6 0 8 0 0) clusters. Their values of E and G are close to 70 GPa and 25 GPa. Especially, the G/B ratio reveals that these alloys are all ductile materials.