Growth behavior of hydrogen micro pores during ductile fracture of a 5154 aluminum alloy

It has generally been assumed that metals usually fail as a result of microvoid nucleation induced by particle fracture. Here we concentrate on high-density micropores filled with hydrogen in aluminium, whose existence has been largely overlooked until quite recently. These micropores exhibit premature growth under external loading, thereby inducing ductile fracture, whereas the particle fracture mechanism operates only incidentally. Conclusive evidence of a micropore mechanism is provided by the observation of an instantaneous release of gas at failure. We can therefore conclude that the growth of micropores dominates ductile fracture. Since the material we used has a standard pore density, we can assume that an identical fracture mechanism operates in other aluminium alloys. This finding suggests that intense heat treatment, which is generally believed to enhance the mechanical properties through homogenisation, may have entirely the opposite effect. This revelation will have a major impact on the engineering design of metals.

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The True Origin of Ductile Fracture in Aluminum Alloys

Toda

Oogo

Horikawa

et al. 2013

Metall Mater Trans A

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Growth behavior of hydrogen micro pores during ductile fracture of a 5154 aluminum alloy

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The True Origin of Ductile Fracture in Aluminum Alloys

The True Origin of Ductile Fracture in Aluminum Alloys

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