摘要
A dense and uniform 50%AlN_p/4032Al(Al-12%Si) composite was fabricated by squeeze casting process that involved pressure infiltration of molten 4032Al into a porous AlN preform. TEM observations show that there are high densities of dislocations in the aluminum, and these thermally induced dislocations are attributed to the difference of coefficients of thermal expansion between AlN and aluminum. The Si phases in the matrix are found to preferentially nucleate around AlN particles, and the reasons influencing heterogeneous nucleation of Si on AlN are discussed. The composite exhibits excellent mechanical properties, with a Brinell hardness of 268 and a bending strength of 556MPa. The modulus of AlN_p/Al composite reaches 145GPa and agrees well with the prediction by Hashin-Shtrikman model.
A dense and uniform 50%AlN_p/4032Al(Al-12%Si) composite was fabricated by squeeze casting process that involved pressure infiltration of molten 4032Al into a porous AlN preform. TEM observations show that there are high densities of dislocations in the aluminum, and these thermally induced dislocations are attributed to the difference of coefficients of thermal expansion between AlN and aluminum. The Si phases in the matrix are found to preferentially nucleate around AlN particles, and the reasons influencing heterogeneous nucleation of Si on AlN are discussed. The composite exhibits excellent mechanical properties, with a Brinell hardness of 268 and a bending strength of 556MPa. The modulus of AlN_p/Al composite reaches 145GPa and agrees well with the prediction by Hashin-Shtrikman model.
出处
《中国有色金属学会会刊：英文版》
CSCD
2005年第S2期256-260,共5页
Transactions of Nonferrous Metals Society of China
基金
Project(G20000672063)supportedbytheNationalBasicResearchProgramofChina
