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- 저자 : M. Lütfi Öveçoğlu (검색결과 1 건)
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Sıddıka Mertdinç,Duygu Ağaoğulları,Emre Tekoğlu,M. Lütfi Öveçoğlu 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.6
In this study, first of all, sub-micron LaB6reinforcing particles were synthesized in the size range of 100–500 nm viamechanochemical synthesis and leaching steps. Afterwards, Al-7 wt% Si matrix alloy and 2 wt% laboratory synthesizedLaB6powders were mechanically alloyed (MA’d) at different durations to constitute Al-7 wt% Si/2 wt% LaB6. Followedby compaction under a pressure of 450 MPa in a uniaxial cold press, samples were sintered at 570 °C for 2 h in flowing Argas atmosphere. Microstructural characterizations of the powders and sintered samples were performed using X-Ray Diffractometry(XRD) and Scanning Electron Microscopy (SEM) techniques. Effects of both MA (0, 1, 4 and 8 h) and LaB6reinforcement (0 and 2 wt%) on the mechanical properties of the composites were determined in terms of microhardness anddry sliding tests. Both MA process and LaB6reinforcement were found to make positive contribution to the hardness andwear resistance values. As-blended and sintered Al-7 wt% Si matrix alloy had a hardness value of 0.43 GPa. On the otherhand, 8 h MA’d and sintered Al-7 wt% Si/2 wt% LaB6composite had the highest hardness (0.97 GPa) and the 4 h MA’d onehad the lowest wear rate (3.25 × 10−6 mm3/N mm) among all the sintered samples. The hardness and wear resistance valueswere increased by approximately 2 times in the 4 h MA’d and sintered Al-7 wt% Si-2 wt% LaB6composite compared to its1 h MA’d counterpart.
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