WC_p/2024Al复合材料的热变形行为  

Hot Deformation Behavior of WC_p/2024Al Composite

作　　者：王涛[1] 毛昌辉[1] 杨剑[1] 

机构地区：[1]北京有色金属研究总院先进电子材料研究所,北京100088

出　　处：《材料科学与工程学报》2010年第4期558-562,567,共6页Journal of Materials Science and Engineering

摘　　要：WCp/2024Al复合材料是一种具有良好力学性能和辐射屏蔽性能的新型铝基复合材料。目前缺乏对其进行塑性加工的研究,因此采用热模拟实验机研究了WCp/2024Al复合材料在623K^773K,应变速率为0.01、0.1和1s-1下的热变形行为。结果显示,复合材料的流变应力随变形温度的升高、应变速率的降低而降低。在较高的应变速率下复合材料的变形机制为动态回复,而在较低的应变速率下为动态再结晶和动态回复。采用Power-Arrhenius型速率方程计算了复合材料的应变速率敏感系数m和热变形激活能Q。结果显示随着温度的升高,复合材料的m值升高而Q值降低,说明升高温度有利于复合材料的高温塑性变形。WC_p/2024Al composite is a new kind of aluminum matrix composite material with excellent mechanical performances and radiation shielding properties. For lack of research on its plastic working,hot deformation behavior of WC_p/2024Al composite was investigated by using a dynamic testing machine at different temperatures and strain rates ranging from 623K to 773K and 0.01s-1 to 1s-1,respectively.The results indicate that the flow stress of WCp/2024Al composite decreases with increasing the deformation temperature and with decreasing the strain rate.At higher strain rate,deformation mechanism of the composite is dominated by dynamic recovery,while at lower strain rate the dominating mechanism is dynamic recrystallization and dynamic recovery.The strain rate sensitive coefficient m and the hot deformation activation energy Q of the composite are calculated by using the Power-Arrhenius function.The results show that with the increase of temperature,the value of m increases but Q decreases,which indicates the elevating temperature plays a positive role on the deformation ability of WCp/2024Al composite.

关 键 词：铝基复合材料 热变形 动态回复 动态再结晶 

分 类 号：TB331[一般工业技术—材料科学与工程]