摘要
采用KBF4和K2TiF6混合盐反应工艺制备了原位TiB2颗粒增强Al-5Cu复合材料。运用XRD,扫描电镜和维氏硬度测量仪等材料分析手段研究了复合材料的微观组织和固溶时效行为。研究结果表明,原位内生TiB2颗粒不仅显著细化了复合材料的凝固组织,而且使材料的硬度明显提高。TiB2颗粒的引入加速了复合材料的时效进程,这是由于TiB2颗粒与基体合金的热膨胀系数差别较大,固溶淬火时由热错配产生的空位和高密度位错促进了过渡相的形核和长大。
In-situ TiB2 particles reinforced Al-4.5Cu alloy composites were synthesized successfully by the reaction of halide salts of KBF4 and K2TiF6 with aluminum melt. Solidification structure and solid solution-aging behavior of the composites were investigated by XRD (X-ray diffraction), SEM (scanning electron microscope) and Vickers hardness tester. The results show that with the addition of TiB2 particles, solidification structure of the composites is refined apparently with the great increase of hardness. TiB2 particles accelerate the aging process in the Al-4.5Cu alloy, which is attributed to the fact that vacancy and high density dislocation generate from thermal mismatch as a result of great thermal expansion coefficient difference between the TiB2 particles and the Al matrix promote nucleation and growth of the transition phase.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2011年第3期263-265,194,共3页
Special Casting & Nonferrous Alloys
基金
江西省教育厅2010年度青年科学基金资助项目(GJJ10198)
关键词
TIB2颗粒
复合材料
固溶时效
位错
TiB2 Phase, Composites, Solid Solution and Aging, Dislocation
