Development of microstructure in solution-heat-treated Mg-5Al-xCa alloys
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Abstract
The development of the microstructure in Mg–Al –Ca alloys was investigated both in the as-cast condition and after solution heat treatment at 415 °C for 0.25 – 120 h, using secondary electron imaging, electron probe microanalysis and X-ray diffraction analysis in combination with light microscopy and image analysis. The main intermetallic compound in the Ca-containing alloys is Al2Ca, and the formation of the Mg17Al12 phase is suppressed in the presence of Ca. The decomposition of Al2Ca during the solution treatment is more difficult than that of Mg17Al12, and undissolved Ca was still present in the form of stable Al2Ca even after 120 h. With increasing treatment time, the coarse Al2Ca phase, which was continuously distributed like a network around the α-Mg grains in the as-cast state, underwent thinning and necking in the initial stage. Then it became disconnected and fragmentized, and finally the fragmentized Al2Ca particles were spheroidized and fined due to the diffusion of Ca and Al along the Al2Ca/Mg interface. As a result, the continuous network-like Al2Ca phase turned into a dispersion of spherical particles. The fine Al2Ca particles were homogeneously distributed in the matrix, which can be very beneficial to creep resistance and mechanical properties of Ca-containing alloys.
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Financial support for this work was provided by the Key Project of National 863 High Technology Programs (Grant No. 2001AA331030) from the Ministry of Science and Technology of the People’s Republic of China.
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© 2003 Carl Hanser Verlag, München
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- Notifications/Mitteilungen
- Personal/ Personelles
- Information
- Books/Bücher
- Conferences /Konferenzen
Articles in the same Issue
- Frontmatter
- Articles/Aufsätze
- An atomistic Monte Carlo simulation of precipitation in a binary system
- Thermodynamic assessment of the Pd–Zr system
- Cyclic deformation and dislocation structure evolution of a copper bicrystal with components rotating gradually along the grain boundary
- Microstructural characterization of alloys of the quasibinary Cu–NiBe system
- Microstructural characterisation and thermal stability of a metastable Mg-8.6 wt.% Zr alloy produced by physical vapour deposition
- Development of microstructure in solution-heat-treated Mg-5Al-xCa alloys
- The effect of Ti alloying on the mechanical properties and microstructure of a Zn–Al–Cu–Mg alloy
- Dry wear response of a Zn-based alloy containing 37.5% Al as affected by sliding conditions
- Microstructure selection map for rapidly solidified Al-rich Al–Sr alloys
- Dependence of the microstructure, residual stresses and texture of AA 6013 friction stir welds on the welding proces
- The effect of carbon on the restoration phenomena during hot deformation of carbon steels
- Deformation behavior during hot torsion of an ultrahigh carbon steel containing 1.3 wt.% C
- Effect of impact damage on electrical resistivity of C/C–SiC composites
- Depth-resolved residual stress evaluation from X-ray diffraction measurement data using the approximate inverse method
- Combined scanning probe microscopy and electron microscopy study of microstructure evolution in copper processed by equal channel angular pressing
- Notifications/Mitteilungen
- Personal/ Personelles
- Information
- Books/Bücher
- Conferences /Konferenzen
