NDTnet - November 1997, Vol.2 No.11

PRACTICAL ULTRASONIC TECHNIQUES FOR ASSESSMENT OF HEAT-DAMAGE IN 7050 ALUMINUM ALLOY

D. S. FORSYTH, R. D. LEBLANC, A. FAHR, A. MASLOUHI, A. MOREAU *

TABLE OF CONTENTS

ABSTRACT

1.0 INTRODUCTION

2.0 HEAT TREATMENTS OF ALUMINUM ALLOYS

TABLE 1:
Heat treatments applied to AA7050 samples.
Sample
Number
Sample
ID
Heat Treatment
3092 A 485°C / 2hrs + 120°C / 20hrs
16003 B 485°C / 2hrs + 120°C / 21hrs+ 160°C / 3hrs
16010 C 485°C / 2hrs + 120°C / 16hrs+ 160°C / 10hrs
40902 D T7451 °as received)
40901 E T7451 °as received)
27230 F 272°C / 30min.
30045 G 300°C / 45min.
30060 H 300°C / 60min.

3.0 EXPERIMENT

3.1 SPECIMENS

3.2 NON-DESTRUCTIVE TESTING

3.3 MECHANICAL TESTING


B - E
F - G
Figure 4. TEM micrographs for heat-damaged AA7050, from top left with precipitates changing from coherent GP zones to incoherent ' and phases.
Figure 5. Optical microscope pictures of grains in different samples: on the left, sample G, a heat damaged sample. On the right, sample E, at temper 7451. Black bars in centre of images are 200 mm long.

3.4 MICROSTRUCTURE EVALUATION

4.0 RESULTS

4.1 MICROSTRUCTURE EVALUATION

4.2 PATTERN RECOGNITION

4.3 ULTRASONIC ATTENUATION AND MECHANICAL PROPERTIES

5.0 CONCLUSION

6.0 ACKNOWLEDGMENTS

7.0 REFERENCES

Authors:

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© Copyright 13. Nov 1997 Rolf Diederichs, rd@ndt.net
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