Microstructure elaboration and mechanical properties of AlNp/4032Al composite
来源期刊：中国有色金属学报(英文版)2005年第z2期
论文作者：张强 武高辉 韩杰才 陈国钦
文章页码：256 - 260
Key words：AlN； aluminum matrix composite； microstructure； mechanical property
Abstract: A dense and uniform 50%AlNp/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 AlNp/Al composite reaches 145GPa and agrees well with the prediction by Hashin-Shtrikman model.
