摘要
采用差示扫描量热技术和透射电镜显微分析技术,研究了铸造SiCp/2024金属基复合材料基体沉淀的动力学过程。结果表明:相对于无SiC的基体材料,SiC的加入加速了GP区和中间相S′(Al_2CuMg)的析出,析出反应的蜂值温度下降,GP区和S′相的脱溶反应焓明显降低。TEM分析发现合金元素Mg在SiC-Al界面上偏聚,使界面附近基体中的Mg被耗尽,形成无沉淀区和沉淀稀疏区,相脱溶量下降。
The kinetic process of precipitation in matrix of cast SiCp / Al composite was studied by differential scanning calorimetry and transmission electron microanalysis techniques. In comparison with the matrix free from SiC, an additive of SiC in composite may accelerate the precipitation of GP zone and intermediate phase S'(Al_2CuMg) and decrease the peak temperature. The enthalpy of precipitation of both GP zone and S'-phase reduces substantially. TEM analysis showed that the alloying element Mg segregates at the SiC-Al interface. Thus, the Mg nearby the interfaces in matrix depleted, and the precipitate-free zone and precipitate-sparse zone formed near the interface, the amount of precipitate decreased.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第10期B465-B470,共6页
Acta Metallurgica Sinica
基金
国家自然科学基金
上海交通大学金属基复合材料国家重点实验室资助
关键词
基体沉淀
金属复合材料
SiCp/2024, differential scanning calorimetry, precipitation in matrix
