Age Hardening In A Mg-9 Wt.% Al Alloy

Author

J. Beverley Clark, Missouri University of Science and Technology

Abstract

The precipitation process and age hardening mechanism in a Mg-9 wt.% Al alloy were studied principally by transmission electron microscopy. This alloy age hardens by the general precipitation of plates of the equilibrium Mg₁₇Al₁₂ phase on the basal plane of the magnesium solid solution matrix. No evidence for the formation of either G.P. zones or a transition lattice of the Mg₁₇Al₁₂ precipitate was obtained. Cellular precipitation occurs competitively with the general precipitation at nearly all age hardening temperatures. In the solution treated condition, basal slip and {101̄2} twins are the principal deformation modes. Precipitation induces cross slip on the prism planes and tends to suppress {101̄2} twin formation. The alloys are hardened by complex dislocation tangles formed by the interaction of slip dislocations on the prism and basal planes. Neither slip dislocations nor {101̄2} twins shear the Mg₁₇Al₁₂ plates. © 1968.

Recommended Citation

J. B. Clark, "Age Hardening In A Mg-9 Wt.% Al Alloy," Acta Metallurgica, vol. 16, no. 2, pp. 141 - 152, Elsevier, Jan 1968.

The definitive version is available at https://doi.org/10.1016/0001-6160(68)90109-0

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

0001-6160

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 Elsevier, All rights reserved.

Publication Date

01 Jan 1968