Journal
MATERIALS RESEARCH EXPRESS
Volume 8, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/abd2f5
Keywords
Mg– Nd– Sc alloy; isothermal section; phase equilibria; solid solubility
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Funding
- National Natural Science Foundation of China [51571113, 51701094, 51911540474]
- Natural Science Foundation of Jiangsu Province, China [BK20171014]
- Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology [191011-K]
- Guangxi Natural Science Foundation [2018GXNSFAA281254]
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The study focused on phase equilibria in the Mg-rich corner of the Mg-Nd-Sc ternary system, revealing significant ternary solubility in the Mg-3(Mg, Nd, Sc) phase. Meanwhile, Mg41Nd5 showed negligible ternary solubility at all three temperatures. The Mg_hcp phase exhibited a narrow homogeneity range at different temperatures.
Phase equilibria in the Mg-rich corner of Mg-Nd-Sc ternary system was studied by using the equilibrated alloys method. The partial isothermal sections at 500 degrees C, 530 degrees C, and 550 degrees C were constructed by analyzing the phase constitution and the chemical compositions of the present phases in 19 alloy samples. The Mg-3(Mg, Nd, Sc) phase exhibited noticeable ternary solubility introduced by the solid solution of Mg and Sc in the Mg3Nd lattice. (Mg_hcp) showed a narrow homogeneity range paralleling to Mg-Sc binary boundary, whereas Mg41Nd5 showed negligible ternary solubility at all three temperatures. The three-phase equilibrium region of (Mg_hcp) + Mg41Nd5 + Mg-3(Mg, Nd, Sc) dominated the Mg-rich corner and was surrounded by three two-phase equilibrium regions constituted by any two of above three phases. The primary crystals and the solidification pathways of alloys in the Mg-rich corner were analyzed via the as-cast microstructure. The matrix phases of (MgSc_bcc) and/or (Mg_hcp) together with the precipitations of Mg-3(Mg, Nd, Sc) and other ordering structures could provide additional space to optimize microstructure and properties of Sc-alloyed Mg-Nd alloys.
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