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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.55  No.3 (2006)  >  pp.295-300

Journal of the Society of Materials Science, Japan
<<Previous article Vol.55  No.3 (2006)   pp.295 - 300 Next article>>

Extra Long Life Fatigue Properties of Aluminum Die Casting Materials

Koji YAMADA1) and Susumu MIYAKAWA1)
1) Material Eng. R & D Dept., Denso Co. Ltd.


To investigate the extra long life fatigue properties of aluminum die casting materials, fatigue tests were conducted on two type of aluminum die casting materials. One type is Al-Si-Cu die casting alloys ADC10-T5 and the other is Al-Si-Mg die casting alloys AC4C-T6. The main results obtained are as follows, (1) For ADC10-T5, the origin of fatigue crack is casting defect and the fracture surface at around the fatigue crack initiation portions were Mode I fracture surface. (2) For AC4C-T6, the origin of fatigue crack is the base matrix and the fracture surface at around the initiation portion changed from Mode I fracture surface to Mode II fracture surface along with the increase in the number of cycles. At the range of Nf < 105 or about Nf = 105, fracture surface were Mode I fracture surface, about Nf = 106, fracture surface were mixture of Mode I and Mode II fracture surface, and at the range of Nf > 107, fracture surface were Mode II fracture surface. (3) The extra long life fatigue strength (107-109cycles) of AC4C-T6 decreased along with the increase in the number of cycles, while the extra long life fatigue strength (107-109cycles) of ADC10-T5 did not decrease along with the increase of the number of cycles. (4) The casting defect size in non-fracture specimen was much smaller than the allowable defect size predicted by the √area parameter model. It seems to be that the reason why no reduction was recognized in the fatigue strength of the ADC10-T5 in the life range beyond 107cycles.


Keyword:
Aluminum die casting materials, Extra long life fatigue properties, Mode I fracture surface, Mode II fracture surface √area parameter model

Received: July 25, 2005
Published online: April 26, 2006
Copyright (c) 2006 by The Society of Materials Science, Japan

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