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Microstructure and Tensile Properties of ZK60 Alloy Fabricated by Simplified Rapid Solidification Powder Metallurgy (S-RS P/M) Process

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Journal of materials Science & Technology 2010年第2期26卷 151-155页

作者： zhenya zhang, huashun yu , shaoqing wang, haitao wang and guanghui min key laboratory of liquid structure and heredity of materials, ministry of education, shandong university, jinan 250061, china key laboratory of liquid structure and heredity of materials Ministry of Education Shandong University Jinan 250061 China

This study investigated the microstructures and mechanical properties of ZK60 alloy prepared by a simplified rapid solidification powder metallurgy （RS P/M） processing system （S-RS P/M）, which consists of warm press in dry air and hot extrusion. Microstructure characterizations showed that S-RS P/M alloy consisted of magnesium matrix and oxide stringers of ~1 #m in width. TEM （transmission electron microscopy） observations illustrated nano-size magnesia particles （10-30 nm） constituted oxide stringer in detail. Due to a relatively higher volume of nano-size magnesia particle produced during S-RS P/M process, 0.2% yield strength of S-RS P/M ZKO0 alloy was found to be as high as 382 MPa, which is 10% higher than that of RS P/M alloy. The improvement in mechanical properties is mainly attributed to the combination effects of Orowan mechanism and coefficient of thermal expansion （CTE） mismatch because of the approximately same average grain size.

关键词： Microstructure Mechanical properties Rapid solidification powder metallurgy Nano-size magnesia

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Microstructural Evolution of Rapidly Solidified ZK60 Powders during Extrusion

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Journal of materials Science & Technology 2011年第2期27卷 159-164页

作者： zhenya zhang huashun yu shaoqing wang Hui yu guanghui min key laboratory for liquid-Solid Structural Evolution and Processing of materials Ministry of EducationShandong UniversityJinan 250061China School of materials Science and Engineering Jiangsu UniversityZhenjiang 212013China

The microstructural evolution of rapidly solidified（RS） ZK60 powders extruded at 250 C was *** was shown that formation of new ultrafine grains took place through continuous dynamic recrystallization（CDRX）,accompanied by the perfect bonding of powders via severe plastic *** a low strain level,a well-defined structure made up of equiaxed and elongated subgrains was ***,the operation of basal and non-basal dislocation slip led to the formation of low-angle dislocation cells（LADC） within the elongated *** increasing strain,the number and average misorientation of LADC increased,resulting in fragmentation of original elongation subgrains into a finally homogeneous fine-grained *** full-recrystallized structure with an average grain size of 0.4 μm was finally evolved after large cumulative *** results suggested that structural change was connected with thermal strain,where dislocation activities dominated this process.

关键词： Microstructure Extrusion ZK60 powders Dislocation slip

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Effect of Aluminium and Silicon on High Temperature Oxidation Resistance of Fe-Cr-Ni Heat Resistant Steel

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Transactions of Tianjin university 2009年第6期15卷 457-462页

作者：王海涛赵奇于化顺张振亚崔红卫闵光辉 key laboratory of liquid structure and heredity of materials of ministry of education School of Materials Science and Engineering Shandong University School of materials Engineering Yantai Nanshan University

Fe-Cr-Ni heat resistant steels with different contents of Al and Si were cast in intermediate frequency induction furnace with non-oxidation method. With oxidation weight gain method, the oxidation resistance of test alloys was examined at 1 200 ℃ for 500 h. The effects of Al and Si on oxidation resistance were studied through analyses of X-ray diffraction （XRD） and scanning electron microscope （SEM）. It is shown that the composition of oxide scales is a decisive factor for the oxidation resistance of heat resistant steels. The compounded scale composed of Cr203, α-Al2O3, SiO2 and Fe （Ni）Cr2O4, with flat and compact structure, fine and even grains, exhibits complete oxidation resistance at 1 200 ℃. Its oxidation weight gain rate is only 0.081 g/（m^2.h）. By the criterion of standard Gibbs formation free energy, a model of nucleation and growth of the compounded scale was established. The formation of the compounded scale was the result of the competition of being oxidated and reduction among Al, Si, and the matrix metal elements of Fe, Cr and Ni. The protection of the compounded scale was analyzed from the perspectives of electrical conductivity and strength properties.

关键词： heat resistant steel oxide scale oxidation resistance

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