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PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. 1. REPORT DATE (DD-MM-YYYY)
25/Jun/2001
REPORT TYPE
MAJOR REPORT
DATES COVERED (From -To)
TITLE AND SUBTITLE
BOLT LOAD RETENTION BEHAVIOR OF A DIE CAST MAGNESIUM RARE EARTH ALLOY5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER
AUTHOR(S)CAPT MORENO IAN P 5d. PROJECT NUMBER 5e. TASK NUMBER 5f. WORK UNIT NUMBER
PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)
UNIVERSITY OF MICHIGAN
SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)THE DEPARTMENT OF THE AIR FORCE AFIT/CIA, BLDG 125 2950 P STREET WPAFB OH 45433 The following abstracts are taken from the papers Captain Moreno wrote describing his research while a master's student at the U of M. This work, along with the completion of required courses and presentations at major research conferences, fulfilled the requirements imposed by his advisors, his department, and the Horace H. Rackham School of Graduate Studies for the awarding of his M.S.E. degree. The following describes the publishing status of these papers. The need for improved understanding of new magnesium alloys for the automotive industry continues to grow as the application for these lightweight alloys expands to more demanding environments, particularly in drivetrain components. Their use at elevated temperatures, such as in transmission cases, presents a challenge because magnesium alloys generally have lower creep resistance than aluminum alloys currently employed for such applications. In this study, a new die cast magnesium alloy, MEZ, containing rare earth (RE) elements and zinc as principal alloying constituents, was examined for its bolt-load retention (BLR) properties. Preloads varied from 14 to 28 kN and test temperatures ranged from 125 to 175°C. At all test temperatures and preloads, MEZ retained the greatest fraction of the initial imposed preload when compared to the magnesium alloys AZ91D, AE42, AM50, and the AM50+Ca series alloys. The BLR behavior of MEZ did not show significant sensitivity to temperature within the range examined, whereas the other alloys displayed a clear decrease in bolt-load retention with increased temperature at a given preload. Retained bolt-load ...
