Damage assessment of Al alloys using in situ tensile tests in x-ray tomography

Zhou, Suxia; Maire, Éric; Xie, Jiacheng; Bareggi, Andrea; Adrien, Jérôme; DiMichiel, Marco

doi:10.1117/12.839378

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“…In situ micro-tomography focusing on the investigation of the phenomenon of creep damage in MMCs provide a new insight into the internal material processes under mechanical and/or thermal loading [26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

“…In this study, time-resolved in situ 3D-analyses by synchrotron X-ray µ-tomography were carried out to analyze the formation and growth of the cavitation based on the number and the volume as well as the morphology of the voids during creep to approach the creep mechanisms behind in the early and late creep stages. In situ micro-tomography focusing on the investigation of the phenomenon of creep damage in MMCs provide a new insight into the internal material processes under mechanical and/or thermal loading [26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

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In Situ 3D-µ-Tomography on Particle-Reinforced Light Metal Matrix Composite Materials under Creep Conditions

Camin

Hansen

2020

Metals

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In transportation light metal matrix composites (L-MMCs) are used increasingly due to their improved creep resistance even at higher application temperatures. Therefore, the creep behavior and failure mechanisms of creep loaded particle reinforced L-MMCs have been investigated intensively. Until now, creep damage analyses are usually performed ex situ by means of interrupted creep experiments. However, ex situ methods do not provide sufficient information about the evolution of creep damage. Hence, in situ synchrotron X-ray 3D-µ-tomography investigations were carried out enabling time and space resolved studies of the damage mechanisms in particle-reinforced titanium- and aluminum-based metal matrix composites (MMCs) during creep. The 3D-data were visualized and existing models were applied, specifying the phenomenology of the damage in the early and late creep stages. During the early stages of creep, the damage is determined by surface diffusion in the matrix or reinforcement fracture, both evolving proportionally to the macroscopic creep curve. In the late creep stages the damage mechanisms are quite different: In the Al-MMC, the identified mechanisms persist proportional to creep strain. In contrast, in the titanium-MMC, a changeover to the mechanism of dislocation creep evolving super-proportionally to creep strain occurs.

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