SiC_P/Al复合材料温度变化引致尺寸不稳定性的研究  

Studies on Temperature Induced Dimensional Instability of Silicon Carbide Particulate Reinforced Aluminium Composite Materials

作　　者：张帆[1] 李小璀[1] 张国定[1] 

机构地区：[1]上海交通大学金属基复合材料国家重点实验室,上海200030

出　　处：《热加工工艺》2000年第1期5-7,共3页Hot Working Technology

基　　金：国家自然科学基金!(59871027)

摘　　要：研究了ＳｉＣｐ／Ａｌ系复合材料经不同热处理后在温度反复变化时的尺寸稳定性。结果表明，在温度反复循环后会产生累积残余应变εｃｒ，随循环次数的增多，εｃｒ减小，尺寸趋于稳定。预处理对热循环累积残余应变有影响，退火态εｃｒ最大，时效态次之，而预循环态最小。复合材料中颗粒尺寸越大、颗粒体积分数越高以及基体越硬均对抵抗环境温度变化尺寸稳定性有利。与均质的纯铝相比较，复合材料的热循环累积残余应变较大，抵抗温度反复变化尺寸稳定性较低。Dimensional stability of silicon carbide particulate reinforced aluminum composites (SiC P/Al) during thermal cycling between 25℃ and 150℃,which was used to simulating temperature fluctuation at ambient atmosphere condition,has been studied .The results showed that the composites presented positive cumulative residual strains( ε cr ) in length direction of the specimens during thermal cycling,i.e.existed non reversible dimensional changes.With increase in cyclic number the ε cr decreased.Preheat treatment could influence the ε cr value.The ε cr of annealed specimens was largest,subsequent was the as aged,pre thermal cycled specimens exhibited the least ε cr ,suggesting that the pre thermal cycled composites had the best anti temperature fluctuation dimensional stability(ATFDS).For SiC P/Al system,larger particle size,less particle volume fraction or harder matrix would be beneficial to ATFDS.It was also found that the composites were of lower ATFDS compared to the pure aluminum.

关 键 词：SICP/AL 复合材料 尺寸稳定性 热循环 预处理 

分 类 号：TB333[一般工业技术—材料科学与工程]