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Effects of La-Ce addition on microstructure and mechanical properties of Al-18Si-4Cu-0.5Mg alloy 被引量:12
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作者 Gao-yong LIN Kun LI +3 位作者 Di feng yong-ping feng Wei-yuan SONG Meng-qiong XIAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第8期1592-1600,共9页
The microstructural evolution and mechanical properties of Al-18 Si-4 Cu-0.5 Mg alloy modified by the addition of La-Ce rare earth elements through OM,SEM,EPMA and tensile tests were investigated.The results of OM and... The microstructural evolution and mechanical properties of Al-18 Si-4 Cu-0.5 Mg alloy modified by the addition of La-Ce rare earth elements through OM,SEM,EPMA and tensile tests were investigated.The results of OM and SEM analyses indicated that primary Si particles were significantly refined from coarse block-like and irregular polygonal shapes into fine flaky shapes,while eutectic Si particles were modified from coarse and needle-like into fine and rod-or coral-like shapes with increase of La-Ce addition.The alloy exhibited the minimum primary Si particle size and the best mechanical properties with the addition of 0.3 wt.%La-Ce.The average particle size decreased from 61 to 28 μm,the ultimate tensile strength increased from 222 to 242 MPa and the elongation increased from 3.2% to 6.3%.In addition,modification mechanisms and fracture modes were explored by the means of SEM and EPMA. 展开更多
关键词 Al-18Si-4Cu-0.5Mg alloy primary Si eutectic Si La-Ce addition mechanical properties
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In-situ observation and analysis of solidified structure evolution of S50C steel in soaking furnace
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作者 Kai Liu Shu-sen Cheng +4 位作者 Xing-wen Wei Wen-xuan Xu Ji-peng Li yong-ping feng Olena Volkova 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2023年第10期1963-1973,共11页
The evolution of solidified structure of S50C steel during heat treatment in compact strip production process was studied through an ultra-high-temperature confocal scanning laser microscope.It was found that the soli... The evolution of solidified structure of S50C steel during heat treatment in compact strip production process was studied through an ultra-high-temperature confocal scanning laser microscope.It was found that the solidified structure consisted of dendritic crystals with secondary dendrite arm spacing ranging in 32-120μm,where carbon segregation was evident,and the dendrite arms wereα-Fe.The insignificant change was observed at a soaking temperature of 1180℃,whereas at 1300℃,the finer structure firstly disappeared,and then,the coarsening decreased,indicating that carbon tended to be homogenized.Therefore,the microsegregation was improved at 1300℃for 15 min.The phase transformation ofα-Fe→γ-Fe enhanced the carbon diffusion,and the evolution of the equivalent radius req was controlled by carbon diffusion.The diffusion coefficient of carbon(D=15μm2/s)was determined by using the inverse problem method. 展开更多
关键词 Compact strip production process Solidified structure evolution Carbon diffusivity Inverse problem method
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