Paper Titles
Evaluation of Friction Spot Joining Weldability of Al Alloys for Automotive
p.411
Atomic Bonding of Precipitate and Properties of Al-Cu-Mg Alloy
p.417
Robust Trimming of Automotive Panels
p.423
Ultrasonic Leak Test for Automotive Brake Caliper
p.429
Influence of Vacancy Formation and Mg Migration on Cracking in Spot Welding AA5754 Alloys
p.433
Ageing Characteristics and Microstructural Evolution in Microalloyed Al Alloys
p.438
Microstructural Aspects by Electron Microscopy Observed in Al-Mg Based Alloys after Special P/M Processes
p.446
Microsegregation Effect of Copper in Solidification of A356 Alloy
p.452
Control of the Alloying Element Distribution in Al-Alloys by High Magnetic Fields
p.457

Influence of Vacancy Formation and Mg Migration on Cracking in Spot Welding AA5754 Alloys

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Abstract:

Al alloys with Mg as the major alloying element constitute a group of non-heat treatable alloys with medium strength, high ductility, excellent corrosion resistance and weldability. However, the segregation of Mg may adversely affect the performance of these materials if they are exposed to rapid heating and cooling environments such as resistance spot welding. The formation and migration of vacancy is an important factor affecting Mg segregation. In this paper, the amount and distribution of Mg were measured by electron probe microanalysis and the vacancy formation energy in AA5754 alloys was measured by positron annihilation lifetime spectroscopy. The results indicated that the segregation of Mg at cracks, occurring under suitable temperature and stress conditions, is related to the formation and migration of vacancies, and may promote crack initiation and propagation.

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Periodical:

Materials Science Forum (Volumes 539-543)

Pages:

433-437

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.539-543.433

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Online since:

March 2007

Authors:

Xiao Wei Wang, Hong Yan Zhang, Ai Qing Sun

Keywords:

AA5754, EPMA, Mg Segregation, Vacancy Formation Energy

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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