Effect of temperature field on types and distribution of reinforcing phases in “in-situ” weld-alloying/PAW of SiC_p/6061Al

Based on theories of heat transfer,physical metallurgy and hydro-mechanical,in order to analyze the effect of welding parameters on species and distribution of reinforcing phases visually and legibly,finite element software ANSYS was used to simulate transient temperature field for SiC_p/AI in“in-situ”weld-alloying/plasma arc welding.The results show that the calculated results approximately agreed with the experimental measured results.So the model is basically correct and credible.Based on the numerical solutions and experimental results,effect of temperature field in different welding process parameters(welding current,welding velocity)on species and distribution of reinforcing phases is analyzed.The results show that adjusting and optimizing temperature field appropriately is an effective method to obtain welded joint with better microstructure and property.     

Effect of different heat treatment process on damping peak of 6061Al/SiCp MMC produced by spray codeposition

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超声频电弧对SiCp/6061Al等离子弧焊缝微观组织的影响

应用高通滤波器原理设计了一台隔离耦合装置,实现了交流弧焊电源与高频 激励源的隔离与耦合,成功在交流电弧中激励出超声波.以自主研制的A1-5Ti-5Si药芯焊丝为填充材料对SiCp/6061A1基复合材料进行等离子弧原位合金化焊接,在不同频率电弧超声作用下研究了电弧超声频率对焊缝组织的影响.对比0(不加超声),30,40...     

Interfacial microstructure of 20% SO2/Al matrix composites reinforced with in situ formation ceramic phases

Al matrix composites reinforced with in situ ceramic phases by adding 20% SiO2 were fabricated by powder metallurgy process.The interfacial microstructure of the composites was studied by means of SEM and HREM.It was shown that the ceramic phases mainly composed of spinel MgAl2O4 are formed in situ in the original SiO2 particle and the size of small MgAl2O4 crystallites is about dozens of nanometers,which can adjacent to Al and Si.MgO could not found in original SiO2 particle but a little in matrix and may exist with Si,Mg2Si and Al.Si is mostly distributed in matrix and forms some segregation zones.The size of Mg2Si is about 50-100nm and can usually be seen in the matrix.