Linear-chain configuration of precipitates in Mg-Nd alloys

Y.M. Zhu, H. Liu, Z. Xu, Y. Wang, J.F. Nie

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The linear-chain distribution of precipitates, resembling the characteristic features of bamboo, in a Mg–3 wt.% Nd alloy, aged at 250 C for 10 h, has been examined using high-angle annular dark-field scanning transmission electron microscopy. The configuration consists of bamboo trunks of b1 variants and trunk connections of a hitherto unreported phase designated b2 in this work. The b2 phase has a hexagonal lattice (space group P6, a = 0.523 nm and c = 0.963 nm), and its orientation relationship with the Mg matrix phase is such that h1120ib2 //[0001]a and f1 1 0 0gb2 //f1100ga. The b2 phase is metastable, but it is induced to form and is stabilized by the stress fields of the two adjacent b1 particles. The b2 particle either has a substructure of ð0 0 0 1Þb2 planar faults, or is free of the planar faults, depending on whether the two b1 precipitates connecting it are of the same variant or not. A minor fraction of bamboos also have leaf-like b1 particles attached to the connection point of the bamboo trunks. The formation of the leaf-like particles is analyzed by nteraction energy calculation and phase-field simulation.
Original languageEnglish
Pages (from-to)239 - 247
Number of pages9
JournalActa Materialia
Volume83
DOIs
Publication statusPublished - 2015

Cite this

Zhu, Y.M. ; Liu, H. ; Xu, Z. ; Wang, Y. ; Nie, J.F. / Linear-chain configuration of precipitates in Mg-Nd alloys. In: Acta Materialia. 2015 ; Vol. 83. pp. 239 - 247.
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Linear-chain configuration of precipitates in Mg-Nd alloys. / Zhu, Y.M.; Liu, H.; Xu, Z.; Wang, Y.; Nie, J.F.

In: Acta Materialia, Vol. 83, 2015, p. 239 - 247.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Liu, H.

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