作　　者： ; ; ;

机构地区： 中南大学材料科学与工程学院

出　　处： 《Transactions of Nanjing University of Aeronautics and Astronautics》 2007年第3期265-269,共5页

摘　　要： 采用透射电子显微镜对固溶单级时效处理7055铝合金中的沉淀相进行了研究。在较短的时效时间里,可以观察到GP区在{111}面上形成,随着时效时间增加,GP区逐渐长大。η′亚稳相在120°C时效4 h的时候被发现,它与基体的取向关系是[0 0 0 1]η′//[1 11]Al及(1 0 11)η′//( 1 1 0 )Al。在时效达到24 h时, η相便析出,它们与基体存在[ 1 1 0 0 ]η// [ 1 1 0 ]Al及(0 0 0 1)η//(1 1 1)Al的取向关系。由于η′亚稳相和η相颗粒的密度相比于区而言较小,所以GP区对提高该时效合金的强度和硬度起至关重要的作用。 Mierostruetural development of a commercial 7055 （Al-Zn-Mg-Cu）alloy is studied by transmission electron mieroseope（TEM） during the process of single-ageing for up to 48 h. It is observed that Guinier-Preston （GP） zones are formed on { 111} planes when the sample is aged for a short time and grows up gradually with increase of ageing time. η＇ phase is formsed after ageing for 4 h at 120℃, having the orientation relationship with the matrix as[0 0 0 1]η＇//[1 1^- 1]Al and （1 0 1^- 1）η＇//（1 1 0）Al.η phase starts to occur after 24 h ageing and has an orientation relationship with matrix as [1^- 1 0 0]η//[1 1 0]Al and （0 0 0 1）η// （1 1 1）Al. Since the density of both η＇ phase and η phase particles is much lower than that of GP zone on aged alloy, GP zones are important to control the properties of the alloy.

关 键 词： 铝合金 时效 透射电子显微镜

领　　域： [金属学及工艺] [金属学及工艺]