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Ramin Meshkabadi,Ghader Faraji,Akbar Javdani,Ali Fata,Vahid Pouyafar 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.5
Semi-solid processing is a new developing technology for the fabrication of intricate parts at low temperatures incomparison with conventional casting routes. In this research, a parallel tubular channel angular pressing (PTCAP)was used as a pre strain-inducing process, and the influence of the number of PTCAP passes and semi-solid heatingparameters on the microstructural characteristics of Al7075 tubes was investigated. The results demonstratedthat PTCAP process could successfully be used as a best pre-straining method for tubular samples showing semisolidmicrostructures. As the temperature is increased, the solid particle size first decreased, then increased, andgradually became more spherical. The appropriate condition for the subsequent semi-solid forming process wasgained at reheating temperature of 620 oC. The suitability of this temperature was confirmed by the uniform distributionof grains. The grain size and shape factor both increased along with increasing the holding time. The distributionof the solid particles was strongly dependent upon the holding time and became uniform as the holdingtime increased. Comparison of the grain size and shape factor between ECAPed and PTCAPed samples revealed ahigh capacity of the PTCAP process as a strain-inducing stage. Also the two-pass PTCAP samples exhibitedhigher hardness than one-pass treated samples in the semi-solid state.
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