MACROSTRUCTURE AND STRENGTH OF AL–ZN–SN COMPOSITE PRODUCED BY LIQUID PHASE SINTERING OF AL–ZN ALLOY AND PURE TIN POWDER MIXTURE
https://doi.org/10.17073/1997-308X-2018-2-69-75
Abstract
The paper studies the liquid phase sintering features of compacts made of Al–10Zn alloy and Grade PO 2 tin powder mixture as well as the effect of sintering modes on the structure and strength of the (Al–10Zn)–40Sn antifriction composite formed. The porosity of original raw compacts ranged from 5 to 18 %. They were sintered in a vacuum furnace at a residual pressure of gases lower than 10–2 MPa. Sintering temperature varied from 550 to 615 °С, where partial aluminum wetting with liquid tin was observed. Sample holding time at a given sintering temperature was 30–180 min. Structural studies have shown that the particle size of aluminum and tin phases increased with an increase in sintering temperature and holding time. Mechanical properties of sintered composites were determined by the compression test. Test samples were cut from the middle area of sintered compacts. The tests have shown that (Al–10Zn)–40Sn composite samples have high ductility. Moreover, these samples exhibit higher strength in comparison with Al–40Sn sintered composite with a pure aluminum matrix due to more intensive strain hardening of the matrix at high deformation levels. It was found that the composites obtained when sintering samples with a low initial porosity and subjected to pre-exposure at low temperature have the highest strength. Based on the reported results it can be concluded that the liquid-phase sintering method within the specified temperature range allows to obtain the (Al–10Zn)–40Sn composites with a continuous aluminum matrix to effectively prevent localized deformation in the soft Sn interlayers. The optimum sintering temperature should not exceed 600 °С.
About the Authors
N. M. Rusin
Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences (ISPMS SB RAS)
Russian Federation
Russian Federation
Cand. Sci. (Tech.), Senior researcher, Laboratory of physics of nanostructured functional materials,
634055, Tomsk, pr. Akademicheskii, 2/4
A. L. Skorentsev
Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences (ISPMS SB RAS);
Tomsk Polytechnic University
Russian Federation
Russian Federation
Cand. Sci. (Tech.), Junior researcher, Laboratory of physics of nanostructured functional materials;
Engineer of Department of general physics, 634050, Tomsk, Lenin av., 30
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Review
For citations:
Rusin N.M., Skorentsev A.L. MACROSTRUCTURE AND STRENGTH OF AL–ZN–SN COMPOSITE PRODUCED BY LIQUID PHASE SINTERING OF AL–ZN ALLOY AND PURE TIN POWDER MIXTURE. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2018;(2):69-75. (In Russ.) https://doi.org/10.17073/1997-308X-2018-2-69-75
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