Propagation of short fatigue cracks in permanent and semi-solid mold 357 aluminum alloy
Source abstract
Abstract
Abstract The high cycle fatigue strengths of aluminum–silicon–magnesium 357 alloy prepared by permanent molding and semi-solid molding are measured. Results show that precipitation hardened permanent mold (PM) and semi-solid mold (SSM) materials have fatigue strengths at 10 7 cycles of 82 MPa and 113 MPa respectively at R = −1, and of 47 MPa and 78 MPa respectively at R = 0.1. For all tested specimens, the propagation of short cracks occupies a significant portion of the fatigue life. Observation of many short cracks using the replication technique indicates that grain boundaries are important microstructural barriers to short crack propagation in these materials. It is proposed that the fatigue strength at 10 7 cycles of the studied materials is the stress amplitude under which a short crack will be stopped by the first grain boundary encountered. In the absence of defects bigger than the grain size, the average fatigue strength is inversely proportional to the square root of the average grain size.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Aluminum Alloys Composites Properties · Aluminum Alloy Microstructure Properties · Fatigue and fracture mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (23)
Show source-provided references
1. High cycle fatigue strength of permanent mold and rheocast aluminum 357 alloy10.1016/j.ijfatigue.2010.01.001 ↗
2. Fatigue property of semisolid A357 aluminum alloy under different heat treatment conditions10.1007/s10853-006-0838-5 ↗
3. Specific properties of produced parts using the thixocasting process
4. Fatigue properties of a semi-solid cast Al–7Si–0.3Mg–T6 alloy
5. Fatigue crack growth characteristics in cast Al–Si–Mg alloys: Part I. Effect of processing conditions and microstructure10.1016/S0921-5093(04)00871-8 ↗
6. Fatigue crack growth behavior in semi-liquid die-cast Al–7%Si–4%Mg alloys with fine effective grain structure10.1016/S0921-5093(00)01981-X ↗
7. Lados DA, Apelian D. In: Proceedings of the 8th international conference on semi-solid processing of alloys and composites, Limassol; 2004. p. 833–42.
8. Doutre D, Langlais J, Roy S. In: Proceedings of the 8th international conference on semi-solid processing of alloys and composites, Limassol; 2004. p. 397–408.
9. Brochu M. Comportement en fatigue de l’aluminium 357 coulé par gravité et rhéocoulé. Montréal: École Polytechnique de Montréal; 2010. p. 151.
10. Odegard JA. Fatigue behaviour in a DC-cast A356 (AlSi7Mg) aluminium casting alloy. Trondheim: Universitet I Trondheim Norges Tekniske Hogskole; 1992. p. 165.
11. Brochu M, Verreman Y, Ajersch F, Charest N. In: Proceedings of the 12th international conference on fracture, Ottawa; 2009. p. 1–10.
12. Rose H. Propagation des fissures de fatigue dans l’alliage d’aluminum 357 coulé par gravité et rhéomoulé. Montréal: École Polytechnique de Montréal; 2009. p. 108.
13. Study of the interaction of a short fatigue crack with grain boundaries in a cast Al alloy using X-ray microtomography10.1016/S1359-6454(02)00320-8 ↗
14. Bolingbroke RK, King JE. A comparison of long and short fatigue crack growth in a high strength aluminium alloy. In: Miller KJ, Rios ERdl, editors. The behavior of short fatigue cracks. London, UK: Mechanical Engineering Publications; 1986, p. 101.
15. Empirical stress-intensity factor equation for the surface crack10.1016/0013-7944(81)90116-8 ↗
16. Oxide films, pores and the fatigue lives of cast aluminum alloys10.1007/BF02735010 ↗
17. Rabbe P, Anquez L. L’amorçage des fissures de fatigue. In: Bathias C, Pineau A, editors. La fatigue des matériaux et des structures 1. 3e éd. Paris: Éditions Hermès; 2008. p. 15–51 [chapitre 3].
18. Plumtree A, Schäfer S. Initiation and short crack behavior in aluminium alloy castings. In: Miller KJ, Rios ERdl, editors. The behavior of short fatigue cracks. London, UK: Mechanical Engineering Publications; 1986. p. 215.
19. Experimental study of porosity and its relation to fatigue mechanisms of model Al–Si7–Mg0.3 cast Al alloys10.1016/S0921-5093(01)01225-4 ↗
20. Effects of solidification structure on short fatigue crack growth in Al–7%Si–0.4%Mg alloy castings10.1016/S0921-5093(01)01713-0 ↗
21. Experimental investigations of fatigue characteristics of AC4CH cast aluminum alloys fabricated through rheocast and squeeze cast methods10.4028/www.scientific.net/MSF.396-402.1353 ↗
22. Verreman Y. Propagation des fissures courtes. In: Bathias C, Pineau A, editors. La fatigue des matériaux et des structures 2. 3e éd. Paris: Éditions Hermès; 2008. p. 15–51 [chapitre 7].
23. Hobson PD, Brown MW, de los Rios ER. Two phases of short crack growth in a medium carbon steel. In: Miller KJ, de los Rios ER, editors. The behavior of short fatigue cracks. London, UK: Mechanical Engineering Publications; 1986. p. 441.