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Microstructure and Properties of 7A04 Alloy Prepared by Thixo-Forging

The effect of thixo-forging process on morphologies of particles that affect fracture mode of 7A04 alloy was studied. Microstructure and fracture surfaces of thixo-forged samples were investigated by image analyzing technique and scanning electron microscopy. The analyses of the ruptured surface were conducted with specimens taken in-situ from ruptured surfaces of thixo-forged parts. It is suggested that samples fractured in an area with higher liquid fraction have superior mechanical properties, especially elongation, and consequently a failure type of inter-crystalline cracking could be the main fracture mechanism. On the contrary, samples fractured in an area with lower liquid fraction have inferior mechanical properties and the principal resistance force is created by the contacting solid particles, a failure type of trans-crystalline rupture could be the main fracture mechanism.