Strain-Hardening Behavior of Mg-Li-Zn Alloy Thin Sheets under Tension

Horng Yu Wu; Pin Hou Sun; Chui Hung Chiu; Geng Zhong Zhou

doi:10.4028/www.scientific.net/AMR.146-147.1361

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Strain-Hardening Behavior of Mg-Li-Zn Alloy Thin Sheets under Tension
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Reliability Analysis of LCF Life for a Turbine Disk
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 146-147Strain-Hardening Behavior of Mg-Li-Zn Alloy Thin...

Strain-Hardening Behavior of Mg-Li-Zn Alloy Thin Sheets under Tension

Abstract:

This work examined the effects of Li content on the strain-hardening behaviors of three varieties of Mg−Li−Zn alloys containing approximately 6 wt%, 9 wt%, and 10 wt% of Li. Tensile tests were carried out on specimens in the directions of 0, 45 and 90° to the rolling direction. Kocks–Mecking type plots were constructed to illustrate different stages of strain-hardening. The cold-rolled Mg−6Li−1Zn (designated as LZ61) alloy sheet showed stage II and stage III strain-hardening behaviors at room temperature. The specimens of Mg−9Li−1Zn (designated as LZ91) and Mg−10Li−1Zn (designated as LZ101) alloy sheets did not show stage II strain-hardening. Higher initial strain-hardening rates were observed in the 90° direction for these alloys as a result of the cold-rolled fibrous structure affording stronger barriers to dislocation movements in this direction.