Digitale Medien
Springer
Journal of materials science
34 (1999), S. 3653-3658
ISSN:
1573-4803
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Maschinenbau
Notizen:
Abstract Ageing characteristics of an extruded eutectoid Zn-Al based alloy were investigated using X-ray diffraction and scanning electron microscopy techniques. The extruded alloy consisted of Al rich α phase and Zn rich ηE′ and ∈ phases. The original cast eutectoid Zn-Al alloy was extruded at 250 °C. Both supersaturated αs′ and βs′ phase decomposed during extrusion and appeared as fine and coarse lamellar structures. The ηE′ and ∈ phases particles formed in the original interdendritic region. It was found that two Zn rich phases ηE′ and ∈ decomposed sequentially during ageing at 170, 140 °C. The decomposition of the ηE′ phase occurred as a discontinuous precipitation in the early stage of ageing and the decomposition of the ∈ phase took place in a four phase transformation: α + ∈ → T′ + η in the prolonged ageing. Two typical morphologies of the decomposition of the Zn rich phases ηE′ and ∈ were distinctive in back-scattered scanning electron microscopy.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1023/A:1004695120435
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