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Fatigue Properties Of Magnesium Alloy Forgings

Report Number: WADD TR 60-854
Author: Schuette, Evan H.
Corporate Author: Dow Metal Products Company, Division of the Dow Chemical Company
Laboratory: Materials Central
Date of Publication: 1960-12
Pages: 112
Contract: Af 33(038)-22609
Project: 7360
Task: 73604
AD Number: AD0260979

Extensive axial-load and flexural fatigue tests were run on specimens from forged disks of four magnesium alloys; AZ31B, AZ71, AZ80A, and ZK60A. More limited tests were also made on forged disks of QZ66XA magnesium alloy and 2014 aluminum alloy, rolled rod of 2024 aluminum alloy, and AZ81A, AZ91C, and ZK51A magnesium-alloy sand castings, for comparative purposes. Included as a supplement, along with additional specimen data, are results of tests on full-scale I-beams in forged aluminium, forged magnesium, and sand-cast magnesium.

The more highly alloyed materials, AZ71, AZ80A, and ZK60A, showed fatigue properties superior to AZ31B. Among the former three alloys, however, there were no significant differences. Supplemental tests showed magnesium-alloy forgings to compare favorably with aluminum alloy forgings -- and to be superior to magnesium -alloy castings -- in the absence of sharp notches. Separately cast magnesium-alloy test bars give fatigue results equivalent to those obtained from magnesium-alloy forgings. In a production casting, however, it appears that fatigue characteristics may be impaired by the presence of internal stress raisers, which may or may not be visible.

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