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Article Dans Une Revue IOP Conference Series: Materials Science and Engineering Année : 2012

Observation of the initiation and propagation of solidification cracks by means of in situ synchrotron X-ray radiography

Résumé

We report on the in situ, time resolved, observation of solidi cation cracking in a thin sample of an Al-15wt%Sn alloy at ESRF BM05. During the experiment, solidification cracking was seen to occur during natural cooling of the sample at a solid fraction of 95%, between directionally agglomerated dendritic networks. Through detailed analysis, three stages of crack growth were observed: crack initiation, which typically occurs asymmetrically with the liquid lm separating from one side of the dendritic network prior to full detachment; crack propagation, where the liquid lm generally detaches from both sides simultaneously; and crack coalescence. We correlate our observations using scanning electron microscopy, which shows that voids between grains, and also spikes, can appear asymmetrically on either side of the crack surface.

Domaines

Matériaux

Dates et versions

hal-01708658 , version 1 (13-02-2018)

Identifiants

Citer

J Aveson, G. Reinhart, B. Billia, H. Nguyen-Thi, Nathalie Mangelinck-Noël, et al.. Observation of the initiation and propagation of solidification cracks by means of in situ synchrotron X-ray radiography. IOP Conference Series: Materials Science and Engineering, 2012, 33, pp.012040. ⟨10.1088/1757-899X/33/1/012040⟩. ⟨hal-01708658⟩
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