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S.E.M. Fractography of Ultrasonic Fatigue in L65 Aluminum Alloy

Published online by Cambridge University Press:  18 June 2020

K C H Ashley ,
R W Ditchfield  and
G A McD Downie
K C H Ashley
Affiliation:
Royal Naval Engineering College, Manadon, Plymouth, UK
R W Ditchfield
Affiliation:
Royal Naval Engineering College, Manadon, Plymouth, UK
G A McD Downie
Affiliation:
Royal Naval Engineering College, Manadon, Plymouth, UK
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Extract

An aluminium alloy (L65) was fatigue tested in a longitudinal tension compression mode at a frequency of 20 kHz with a mean strain of 1.65.10-3. The specimens used were simple cylinderical rods of fully hardened, solution heat treated or fully annealed aluminium alloy. The effects of the variation in heat treatment on the nature of fracture were investigated by examining the fracture surfaces of these specimens in a Cambridge S4-10 scanning electron microscope.

The fracture surfaces of the fully hardened alloy exhibited the characteristics of cleavage fracture (Stage I and Stage II cracking) in agreement with Forsyth's theories. Occasionally these specimens underwent an unusual mode of centre initiated failure for which the fatigue endurance was greater than that experienced following the surface initiation in similar specimens.

Type
Metals and Alloys
Information
EMSA Proceedings , Volume 33: Proceedings Thirty-Third Annual Meeting Electron Microscopy Society of America, Las Vegas, Nevada August 11-15, 1975 , 15 1975 , pp. 44 - 45
Copyright
Copyright © Claitor’s Publishing Division 1975

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