摘要
对ＭＢ１５合金和（Ｂ４Ｃｐ＋ＳｉＣｗ）／ＭＢ１５复合材料在１７０℃的时效特性进行了比较研究。ＤＳＣ结果表明，复合材料中时效相的析出过程比基体合金提前，且析出量增加，而析出相的溶解过程推迟。ＴＥＭ观察发现，复合材料中析出物仍为ＬａｖｅｓＭｇＺｎ２′相，且在ＳｉＣｗ／Ｍｇ与Ｂ４Ｃｐ／Ｍｇ两种界面上和界面反应物ＭｇＢ２上优先析出。维氏硬度测试表明，复合材料有明显的时效加速，达到峰时效只需６ｈ，而基体合金需４０ｈ，但复合材料与基体合金的时效强化效果相近。
Aging characteristics at 170℃ of MB15 alloy and (B 4C p+SiC w)/MB15 composite have been compared using DSC , TEM and HV hardness testings. The DSC shows that precipitating temperature is lower and dissolution temperature is higher in composite than in the base alloy,and aging precipitation content in composite is also higher than in base alloy . TEM shows that aging precipitate in composite is still of Laves MgZn 2′ phase and formes preferentially at interfaces of SiC w/Mg and B 4C p/Mg , and on surfaces of reaction products MgB 2. The results of HV hardness tests show that the aging process in composite is significantly accelerated because of the presence of reinforcements,and hardness peak is obtained at 6 h of aging for the composite and 40 h for base alloy at 170℃ as a result. However, the final aging hardening effect in the composite is same as in the base alloy.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
1999年第2期26-29,共4页
Aerospace Materials & Technology
