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Metals 2016, 6(9), 196; doi:10.3390/met6090196

Enhanced Age Strengthening of Mg-Nd-Zn-Zr Alloy via Pre-Stretching

School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China
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Author to whom correspondence should be addressed.
Academic Editor: Soran Birosca
Received: 2 May 2016 / Revised: 17 August 2016 / Accepted: 19 August 2016 / Published: 24 August 2016
(This article belongs to the Special Issue Process-Structure-Property Relationships in Metals)
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Abstract

Pre-stretching was carried out to modify the microstructure of Mg-Nd-Zn-Zr alloy to enhance its age strengthening. The results indicated that more heterogeneous nucleation sites can be provided by the high density of dislocations caused by the plastic pre-stretching deformation, as well as speeding up the growth rate of precipitates. Comparison of microstructure in non-pre-stretched specimens after artificial aging showed that pre-stretched specimens exhibited a higher number density of precipitates. The fine and coarse plate-shaped precipitates were found in the matrix. Due to an increase in the number density of precipitates, the dislocation slipping during the deformation process is effectively hindered, and the matrix is strengthened. The yield strength stabilizes at 4% pre-stretching condition, and then the evolution is stable within the error bars. The 8% pre-stretched specimens can achieve an ultimate tensile strength of 297 MPa. However, further pre-stretching strains after 8% cannot supply any increase in strength. Tensile fracture surfaces of specimens subjected to pre-stretching strain mainly exhibit a trans-granular cleavage fracture. This work indicated that a small amount of pre-stretching strain can further increase strength of alloy and also effectively enhance the formation of precipitates, which can expand the application fields of this alloy. View Full-Text
Keywords: magnesium alloys; precipitation; pre-stretching; mechanical properties magnesium alloys; precipitation; pre-stretching; mechanical properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Guo, E.; Zhao, S.; Wang, L.; Wu, T. Enhanced Age Strengthening of Mg-Nd-Zn-Zr Alloy via Pre-Stretching. Metals 2016, 6, 196.

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