压铸SiC_W/6061Al复合材料中晶须取向分布与热残余应力  

Whisker Orientation and Distribution of Residual Stress in Squeeze Casting SiC_W/6061A1 Composites

作　　者：姜传海[1] 牟宗花[1] 李寰[1] 王德尊[1] 王中光[2] 徐静[3] 

机构地区：[1]哈尔滨工业大学,哈尔滨150001 [2]中科院金属所材料疲劳与断裂国家重点实验室,沈阳110015 [3]哈尔滨汽轮机有限责任公司,哈尔滨150040

出　　处：《宇航材料工艺》1998年第2期47-49,共3页Aerospace Materials & Technology

基　　金：国家自然科学基金

摘　　要：应用扫描电镜一图像仪联机系统，定量测量压铸态SiCW／6061Al材料中晶须取向分布。借助X射线应力仪，测定复合材料中的残余应力。结果表明，晶须在垂直压铸方向有择优性，残余应力在垂直压铸方向的分量较大。随温度升高，残余应力的变化为：拉应力→零应力→压应力，各应力分量具有相近的零应力温度。低温处理可降低材料室温残余应力及零残余应为温度。The oritentation of whisker in squeeze casting SiCW/Al composites is mearsured by SEM and image analyser. The residual stress is measured by X - ray stress analyser. Results show that the whisker prefers orientation normalto the direction of squeeze, and there is a large stress normal to the direction of squeeze. With a series of testing temperature, the residual stress varies from positive to zero and then to negative, there are similar zero residual stress temperaturein different direction. Residual stress and zero residual stress tempelature can be reduced by low - temperature treatment.

关 键 词：压铸态 复合材料 残余应力 碳化硅 铝 晶须取向 

分 类 号：TB333.03[一般工业技术—材料科学与工程]