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Effect of Solidification Condition on Secondary Dendrite Arm Spacing of the A357 Alloy under Counter-pressure Casting米国发School of Materials Science and Engineering,Henan Polytechnic University摘 要:The effect of counter-pressure casting parameters on secondary dendrite arm spacing (SDAS) of A357 alloy under different process parameters was studied. Quartz......
the corrosion resistance of the Al-Si alloy. ARRABAL et al [24] found that the microstructure of A356 can be refined by adding rare earth Nd and Nd-rich phases leading to the improvement of the pitting corrosion resistance of A356. ZOU et al [25] found that adding varying contents of rare earth metal Yb to the ADC12 alloy can effectively refine the grain size and enhance the corrosion resistance......
the number of primary austenite dendrites,reduces secondary dendritic arm spacing,and changes the eutectic size and quantity.When rare earth alloy is added into gray cast iron,the morphology and quantity...Effect of Rare Earth Alloy Modification on High Carbon Equivalent Gray Cast Iron of Automotive Brake Drum张道文School of Transportation and Automotive Engineering,Xihua University摘 要:
Evaluation of the microstructure, secondary dendrite arm spacing, and mechanical properties of Al–Si alloy castings made in sand and Fe–Cr slag moldsI.Narasimha Murthy,J.Babu RaoDepartment... castings were prepared. Cast products with no porosity and a good surface finish were achieved in all of the molds. These castings were evaluated for their metallography, secondary dendrite arm spacing......
, WENDROCK H, PRIEDE J, GERBETH G, BUECHNER B. Effect of melt convection on the secondary dendritic arm spacing in peritectic Nd-Fe-B alloy [J]. J Alloys Compd, 2009, 480: 295-298. [20] LI Shuang.... The microstructural scales involving the primary dendrite arm spacing (PDAS) and the secondary dendritic arm spacing (SDAS) have been carried out in directional solidification of various peritectic......
electromagnetic field can intensify the temperature fluctuation of the aluminum alloy melt, which helps the secondary arm roots of a dendritic or a rosette-like primary α(Al) grain to be fused and causes... Rheo-squeeze casting of semi-solid A356 aluminum alloy slurry MAO Wei-min(毛卫民), ZHENG Qiu(郑 秋), ZHU Da-ping(朱达平) School of Materials Science and Engineering, University of Science and Technology......
are considered in the model. For solidification speed, the calculation results show good agreement with the experimental data. Tertiary dendritic arm spacing calculated with phase-field model... on microstructure. Finally, two-dimensional simulation produced a dendrite that is similar to that found in the experiment. Key words: hypoeutectic Al-Cu alloy; effective partition coefficient; dendritic arm......
dendrite arm spacing (SDAS) [5,6], microporosity [7,8], intermetallics [9], eutectic silicon particles [10,11], and heat treatments [2,12]. The as-cast microstructure of A356 is usually characterized... treatment at an extremely high temperature [J]. Scripta Materialia, 1999, 41: 767-771. [5] RADHAKRISHNA K, SESHAN S, SESHADRI M R. Dendrite arm spacing in alumium alloy castings [J]. Transactions......
and dendritic A356 brake calipers to determine whether the differences in microstructures have any significant effects. Table 1 Chemical composition limits for alloy A356[3], as well as compositions of alloys... produces a much finer microstructure than SSM-HPDC. Image analysis reveals a secondary dendrite arm spacing (SDAS) of approximately 20 μm in the GDC calipers, whereas the average globule size in CSIR SSM......
structures.Investigations on primary and secondary dendrite arm spacings of primary α-phase during directionally solidified Pb-26wt%Bi hypo-peritectic alloy were carried out in this research,and systematic studies were...Effect of sample diameter on primary and secondary dendrite arm spacings during directional solidification of Pb-26wt.%Bi hypo-peritectic alloyHU Xiaowua,YAN Honga,CHEN Wenjingb,LI Shuangmingc,and FU......