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Title: Plastically Deformed Depth In Shot Peened Magnesium Alloys
Author: Ebihara, Fiore, Angelini
Source: Conf Proc: ICSP-1, (p.209-216)
Publication year 1981
Document number: 1981052
Number of pages: 8
Abstract:
The shot peened damage depth in three Mg alloys, AZ91, EZ33 and ZE41, was evaluated by acoustic (internal friction), electrical conductivity (eddy current), optical
metallography and X-ray diffraction measurements. The internal friction techniques employed included ultrasonic longitudinal wave pulse-echo attenuation, ultrasonic
velocity and surface wave attenuation measurements. Surface wave attenuation at 15 MHz proved to correlate best with cold work damage, especially for alloy AZ91A.
Electrical conductivity measurements, performed with a commercial eddy current instrument, provided quantitative measure of surface roughness and defined peening damage for
the three peening conditions. However, the measurements are indirect and require calibration against a primary signal-damage correlation to give a usable measure of cold
work depth. The optical metallographic measurements gave a direct measure of cold work for alloys EZ33 and ZE11. The etches employed were ineffective for AZ91. X-ray
diffraction measurements gave a direct measure of damage depth for all three alloys. This method involved successive removal of metal layers by chemical etching until
well-defined X-ray patterns were obtained.
Descriptors: Magnesium base alloys-- Nondestructive testing; Shot peening; Ultrasonic testing; Eddy current testing; X ray diffraction; Surface structure
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