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- W2788892736 abstract "Abstract Nanocrystalline metals, e.g., Mg, are often strong but with a low thermal stability. In this study, six solute elements, Ti, Zr, Ta, Co, Cr, La, which are immiscible in Mg under equilibrium conditions, are mechanically alloyed with Mg to study the extension of solid solubility, the thermal stability and the mechanical properties of nanocrystalline Mg. Extended solid solubility of Ti and Zr solutes in Mg matrix is achieved after mechanical alloying. The nanocrystalline Mg is largely stabilized by Ti, moderately stabilized by Zr, and not stabilized by Ta, Co, Cr and La. The onset temperature for a rapid grain growth increases from 100 °C (0.4 Tm) for nanocrystalline Mg to ~ 350 °C (0.68 Tm) for nanocrystalline Mg0.95Ti0.05 (defined as Mg-5Ti). A relatively small grain size of ~ 145 nm is achieved in Mg-5Ti at 350 °C. The enhanced thermal stability of nanocrystalline Mg-Ti alloy can be attributed to the segregation of Ti atoms at grain boundaries. In addition, an abnormal grain growth is also observed because of the inhomogeneous distribution of solute/impurity atoms. The high thermal stability of nanocrystalline Mg-5Ti alloy enables us to degass the mechanically alloyed powders at a high temperature of 300 °C and achieve a porosity-free nanocrystalline bulk with a compressive yield strength of 183 MPa and a fracture strain of above 0.6." @default.
- W2788892736 created "2018-03-06" @default.
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- W2788892736 date "2018-02-01" @default.
- W2788892736 modified "2023-10-14" @default.
- W2788892736 title "Selection of grain-boundary segregation elements for achieving stable and strong nanocrystalline Mg" @default.
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- W2788892736 doi "https://doi.org/10.1016/j.msea.2018.01.058" @default.
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