摘要
利用熔铸技术制备了原位自生Al2O3-TiC/ZL109复合材料。借助SEM,TEM和高温材料实验机等仪器,对铝硅合金ZL109和Al2O3-TiC/ZL109复合材料的高温压缩变形行为和机制进行较为深入的探讨。结果表明,材料的流变应力随压缩变形温度的上升而下降,高的应变速率将提高流变应力的整体水平。ZL109铝硅合金在523～723K,Al2O3-TiC/ZL109复合材料在523～623K温度区间以晶内位错运动为主要特征;在623～723K压缩温度区间Al2O3-TiC/ZL109复合材料以晶内位错运动和晶界滑移并存为主要特征。
The in-situ Al2O3-TiC/ZL109 composite was fabricated by melting cast method. By means of SEM, TEM and tensile test machine, the deformation mechanism and behavior of the aluminum-silicon alloy （ZL109） and Al2O3-TiC/ZL109 composite were investigated. The results showed that the flow stress decreased with temperature increasing, and high strain rates raised the whole levels of deformation curves of both materials. The mechanisms of compressive deformation of ZL109 alloy from 523 K to 723 K and the composite from 523 - 623 K were characterized by the movement of dislocations in the grains; the mechanisms of compressive deformation of the composite from 623 to 723 K were the characteristics of the movement of dislocations in the grains and sliding of grain boundaries.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2009年第5期696-701,共6页
Chinese Journal of Rare Metals
基金
国家教育部重点科学技术项目(206046)
黑龙江省博士后科研启动基金项目(LHK-04039)资助
关键词
原位自生
复合材料
高温压缩
变形机制
in-situ
composite
compression at elevated temperature
deformation mechanism
