Thermo-mechanical Processing of EZK Alloys in a Synchrotron Radiation Beam
Nd, a rare earth element with low solid solubility in Mg, is an ideal alloying element to improve elevated temperature yield strength and creep resistance cost effectively. The addition of Zn leads to further improvement in the elevated temperature properties; therefore, Mg–Nd–Zn alloys are prospective materials for structural and medical applications. In situ synchrotron radiation diffraction was performed during compression at 200 and 350 ℃ for Mg3NdxZn (x = 0, 0.5, 1, 2 wt%) alloys up to a deformation of 0.3 with a deformation rate of 10−3 s−1. The compressed samples were subsequently subjected to electron backscattered diffraction. The results show that at 200 ℃ the addition of Zn increased the ductility. At the beginning of plastic deformation twinning was the dominant deformation mechanism complemented by sub-grain formation at a later stage. At 350 ℃, the compression strength was increased with the addition of Zn and the microstructure of the samples underwent partial dynamic recrystallization during compression.
KeywordsMg–Nd–Zn alloys Intermetallic phases In situ synchrotron radiation diffraction Elevated temperature compression
The authors acknowledge the Deutsches Elektronen-Synchrotron for the provision of facilities within the framework of the proposal I-20170459 EC. K. M. is grateful for support of the Czech Science Foundation Grant number 14-36566G. K. H. acknowledges the support of the Operational Programme Research, Development and Education, The Ministry of Education, Youth and Sports (OP RDE, MEYS) [CZ.02.1.01/0.0/0.0/16_013/0001794]. K. M. and K. H. are grateful for the Financial support of the Czech Science Foundation under the contract 18-07140S.
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