Microstructure and Homogeneity of Semi-Solid 7075 Aluminum Tubes Processed by Parallel Tubular Channel Angular Pressing

Ramin Meshkabadi; Ghader Faraji; Akbar Javdani; Ali Fata; Vahid Pouyafar

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자료유형: 학술저널

저자정보: Ramin Meshkabadi (University of Tehran) Ghader Faraji (University of Tehran) Akbar Javdani (University of Tabriz) Ali Fata (University of Tehran) Vahid Pouyafar (University of Tabriz)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.23 No.5

발행연도: 2017.1

수록면: 1,019 - 1,028 (10page)

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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.

참고문헌 (63)

참고문헌 신청

Gang Chen / 2015 / Microstructure Evolution and Tensile Mechanical Properties of Thixoformed High Performance Al-Zn-Mg-Cu Alloy / Metals and Materials International 21(5):897~906

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J. Jayaraj / 2005 / Globulization mechanism of the primary Al of theAl-15Cu alloy during slurry preparation for rheoforming / Metals and Materials International 11(3):257~262

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