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RISS 인기검색어
- 검색키워드
- 저자 : Mohammad Hossein Paydar (검색결과 2 건)
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Mohammad Khajouei‑Nezhad,Mohammad Hossein Paydar,Majid Mokarizadeh Haghighi Shirazi,Jenő Gubicza 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.12
In this study the feasibility of using high-pressure torsion (HPT) process as a suitable technique for solid-state recycling ofAl alloy machining chips has been evaluated. One and four turns of HPT were used for consolidation of 7075 Al alloy chips/commercially pure Al powder mixtures at room temperature. The prepared mixtures included different weight fraction ofchips in the range from 20 to 100%. The samples were fabricated from either annealed or non-annealed chips. Additionally,the effect of the fraction of 7075 Al chips on the density, microstructure and tensile behavior of the consolidated sampleswas investigated. It was found that the addition of pure aluminum powder played an important role as a binder in the consolidationprocess and yielded improved mechanical properties due to creating lower porosity and better bonding betweenthe chips. Tensile tests revealed that the highest ultimate tensile strength and fracture strain were obtained for the compositecontaining near 50 wt% annealed 7075 Al chips, and fabricated through 4 turns of HPT. Optical microscopy investigationsdemonstrated that these conditions resulted in a fine microstructure with uniform distribution of chips.
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Maryam Abolfazli,Mohammad Hossein Paydar 한양대학교 세라믹연구소 2022 Journal of Ceramic Processing Research Vol.23 No.2
In the present study, Alumina/ Magnesia/ Zirconia/ Graphite (AMZG) refractory composite was fabricated and its physical,mechanical and chemical properties were investigated. The preparation of AMZG refractory composite was modeled andoptimized by using Central Composite Design (CCD). Among all factors, zirconia content (0-5 wt.%), magnesia content (0-10wt.%) and graphite size (fine and coarse grained) were selected. The factors were varied in 5 levels and the responses werefitted by quadratic regression model. Statistical data showed that the highest relative density, modulus of rupture and oxidationresistance were obtained by fine grained graphite at zirconia and magnesia of 3.312 wt.% and 4.075 wt.%, respectively. Quantitative analysis of the X-ray diffraction (XRD) pattern by Rietveld method revealed that the optimal sample compositionincluded 44.2, 26.1, 10.3, 4.2 and 15.2 wt% of corundum, cordierite, spinel, zirconium oxide and graphite phases, respectively. The result of XRD is confirmed by Differential Thermal Analysis (DTA). The oxidation resistance (at 900 oC) of the bestspecimen was investigated.
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