摘要
研究了原位自生成TiCP体积分数为15%的TiCP/2024复合材料在不同温度下的蠕变性能。结果表明原位自生成该复合材料具有良好的抗高温蠕变能力。复合材料的密度变化量随着蠕变应变量和蠕变时间的增加而增加,并且在较低温度时的密度变化量高于较高温度时的密度变化量,当密度变化达到一定数量时产生的蠕变损伤即引起材料蠕变断裂。由于位错与第二相粒子的交互作用,提高了复合材料的抗蠕变能力。蠕变断口形貌表明蠕变过程产生的空穴多在一个颗粒或几个颗粒的聚集处形成,随着温度的升高,空穴不断扩展,直至最后发生延性断裂。温度对蠕变过程具有显著的影响。
The creep properties of in-situ 15%TiCP/2024Al composite were evaluated at various temperatures.The results show that the in-situ 15%TiCP/2024Al composites exhibit high temperature creep strength.The density changes of the composites increase with the increase of creep strain and creep time.And the changes of the density at lower temperature are higher than that at higher temperature.The creep damage can cause creep rupture when the density changes reach a certain extent.Being the interaction between the dislocations and the second-phaseparticles,the creep strength of the composites can be increased.The morphology of creep fracture shows that the cavities usually create at the habitat of one particle of several particles.The cavities spread continuously and ductility rupture will happen in the end.The temperature shows distinct affects to the creep process.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2007年第S1期179-181,共3页
Special Casting & Nonferrous Alloys
