수중환경에서 Fe계 벌크 비정질 합금의 트라이볼로지적 거동
Tribological Behavior of Fe-based Bulk Amorphous Alloy in a Distilled Water Environment
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The tribological behavior of an Fe-based bulk amorphous alloy while sliding against a AISI 304 discis investigated using a unidirectional pin-on-disc type tribometer in dry and distilled water environments. Therod-shaped bulk pins are fabricated by suction casting. The crystallinities of the bulk amorphous alloys beforeand after the friction tests are determined by X-ray diffraction. The friction coefficient and specific wear rate ofthe amorphous pin in the water environment are found to be twice and thrice as much as in the dry environmentat a low applied pressure, respectively. However, at a higher pressure, the friction coefficient and specific wearrate are 0.4 and 1.02 mg/(Nm/s), respectively, in the water environment. A microstructure analysis shows thatthe worn surface of the alloy is characterized by delamination from the smooth friction surface, and thus delaminationis the main wear mechanism during the friction test in dry sliding environment. In contrast, brittle fracturemorphologies are apparent on the friction surface formed in distilled water environment. For the sample testedat a lower sliding speed, the XPS data from the oxide layer are similar to those of the pure element with weaksuboxide peaks. For higher sliding speeds, all the main sharp peaks representing the core level binding energiesare shifted to the oxide region.
Abstract
The tribological behavior of an Fe-based bulk amorphous alloy while sliding against a AISI 304 discis investigated using a unidirectional pin-on-disc type tribometer in dry and distilled water environments. Therod-shaped bulk pins are fabricated by suction casting. The crystallinities of the bulk amorphous alloys beforeand after the friction tests are determined by X-ray diffraction. The friction coefficient and specific wear rate ofthe amorphous pin in the water environment are found to be twice and thrice as much as in the dry environmentat a low applied pressure, respectively. However, at a higher pressure, the friction coefficient and specific wearrate are 0.4 and 1.02 mg/(Nm/s), respectively, in the water environment. A microstructure analysis shows thatthe worn surface of the alloy is characterized by delamination from the smooth friction surface, and thus delaminationis the main wear mechanism during the friction test in dry sliding environment. In contrast, brittle fracturemorphologies are apparent on the friction surface formed in distilled water environment. For the sample testedat a lower sliding speed, the XPS data from the oxide layer are similar to those of the pure element with weaksuboxide peaks. For higher sliding speeds, all the main sharp peaks representing the core level binding energiesare shifted to the oxide region.
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