Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Properties of WE-43 magnesium alloy in high-temperature brittle range

Janusz Adamiec

nr katalogowy: 52740

Crystallisation of the alloys, both during casting and during welding occurs always in some temperature range, called crystallisation range. The nuclei of crystallisation appear during lowering the temperature below liquidus temperature. In a pool of liquid metal the nucleuses form in partially melted crystallites and grow usually to the form of column crystals or dendritic crystals. In a certain moment of crystallisation the crystals begin to interact between each other as long as they form skeleton of continuous solid phase. Temperature in which the crystals begin to interact between each other is called the coherence temperature and the temperature when the network of solid body starts to form - rigidity temperature. Below this temperature the semi-solid body starts to possess the characteristics of solid phase, which means that it preserves the shape and possesses the mechanical properties - the resistance and ductility [1, 2÷4]. Partial tears of the structure and hot cracks of the casts and welded and padded joints are the final effect of the high-temperature brittleness phenomenon. They should be treated as irreversible failures formed in the crystallisation process, which is in the range of liquid and solid phase coexistence [1]. Hot cracks are of intercrystalline character and the main reason of their formulation is the decrease in metal plasticity in certain temperature range, called the brittle temperature range (BTR) and the strain, under the influence of which it is going to be in this particular time range. The decrease in metal ductility may be caused by the decrease in resistance of the crystalline boundaries areas, as a result of presence of liquid film or accumulation of a big amount of defects of crystal lattice in those areas. Liquid phase may appear in the last phase of solidification or as a result of partial melting of the areas of crystalline boundaries during metal heating in solid stage [3]. There are [...]

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