Cast aluminum-matriz composite materials with refractory nanoparticles
1.Introduction In recent years,the new approaches in synthesis methods of multifunctional composite materials (CM) have been developed which grounded on using different mechanisms and scale levels of reinforcing-from mac roscopie to nanosize.Increasing the properties of cast CMs can be realized beth by the introduction of dispers ed refractory fillers in the matrix melt ex-situ and by in ternally producing reinforcement in the matrix due to controlled metallurgical in-situ reactions between a ma trix meh and reacted active element or their com pounds. The internally produced reinforcements are more coherent with the matrix and have many advanta ges such as finer particle size,a more homogenous dis tribution,clear interface and thermodynamically stabili ty in comparison the ex-situ processes 1.In the pres ence of nanoscale additives the in-situ synthesis method can lead to nanostructuring of CMs. The modifying abil ity of nanoscale additives in cast CMs is based on their high energy potential and huge specific surface area; that latter ensures coverage of the entire area of inter faces in a CM at an insignificant content of nanoparti cles (less then 0.1%). Therefore,it can expect the manifestation of the very high activity of nanoadditions as barriers on the surface of growing crystals. Another possibility consists in the inoculation of melts by nanophases,I.e.,in the formation of artificial nuclea tion centers. Although this assumption is most widely used,it also needs a detailed experimental support.
T.A.Chernyshova L.I.Kobeleva I.E.Kalashnikov L.K.Bolotova
Baikov Institute of Metallurgy and Materials Science,Russian Academy of Sciences,Leninskii pr.49,Moscow,119991 Russia
国际会议
The 10th China-Russia System on Advanced Materials and Technologies(第十届中俄新材料新工艺研讨会)
浙江嘉兴
英文
179-183
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）