ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Thixotropy is the most important characteristic of semi-solid materials, and it is decidedby the variation of microstructure during action of handling. In this paper, for the sake of theindustrial thixoforming and numerical simulation, microstructure and stress variation of semisolidmagnesium alloys during isothermal compression is researched. Here, samples are heated to thedesired temperature in the empty space with various holding times and compressed horizontally.Stress–strain curves during compression can be given directly by the experimental computer, andeach of curves show a peak stress in a small strain and then decrease rapidly, which originallybecause of the thixotropy of semisolid materials. Moreover, thixotropy of semisolid magnesiumalloys is clearer with the evolution of microstructures including agglomeration and deagglomerationof solid particles and the moving way of liquid at different places and strain under differentconditions. Microstructures during isothermal compression show that the deagglomeration of solidparticles increase with increasing the strain rate, therefore, the thixotropy of semisolid magnesiumalloys increases. However, when solid volume fractions are lower, the agglomeration of solidparticles doesn’t change obviously with increase or decrease factors, meaning that the thixotropy issmaller. Relationships between thixotropy and microstructure at other different conditions are alsogiven according to the experiments and analysis
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.643.pdf
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