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Ma X.Y.,Harbin Institute of Technology | Zhang Q.,Harbin Institute of Technology | Zhang Q.,National Key Laboratory of Materials Behaviors and Evaluation Technology in Space Environments | Luo Z.C.,Harbin Institute of Technology | And 2 more authors.
Materials Research Innovations | Year: 2014

An Fe-Al multilayer alloy plate was designed and fabricated using hot-dipping aluminium plating at 800°C for 150 s and the diffusion alloying process at 900°C. A multilayer structure of the Fe-Al intermetallic alloy, including Fe2Al5, FeAl2, FeAl and α-Fe (Al), was formed on the surface of a pure iron substrate. After annealing, Fe2Al5/substrate/Fe2Al5diffusion couples became Fe2Al5/FeAl2/FeAl/α-Fe(Al)/substrate/α-Fe(Al)/FeAl/FeAl2/Fe2Al5. The Al content decreased from surface to centre and showed a gradient distribution. The geomagnetic shielding factor of the Fe-Al multilayer alloy plate was 23·6, about seven times as high as pure iron. The excellent shielding effectiveness was ascribed to the structure of soft magnetic alloy layer/substrate/soft magnetic alloy layer. © W. S. Maney & Son Ltd. 2014. Source


Chi H.T.,Harbin Institute of Technology | Jiang L.T.,Harbin Institute of Technology | Jiang L.T.,National Key Laboratory of Materials Behaviors and Evaluation Technology in Space Environments | Kang P.C.,Harbin Institute of Technology | And 4 more authors.
Materials Research Innovations | Year: 2014

B4Cp/2024Al composite with volume fraction of 45% was designed and fabricated by pressure infiltration technology. Microstructure and friction and wear properties of B4Cp/2024Al composites were studied. The results show that reinforcement particles are uniformly distributed and a qualified relative density of the composite has been achieved. A high density of dislocations was observed to be in the peripheral area of the reinforcement particles, and a large number of fine acicular precipitates were found. Coefficient of friction of B4Cp/2024Al composites decreased slightly with increasing load and sliding speed, meanwhile, the wear rate increased with increasing load and sliding speed. Main forms of wear in B4Cp/2024Al composites were abrasive wear, adhesive wear and oxidation wear. © W. S. Maney & Son Ltd. 2014. Source

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