航空材料学报2012，Vol.32Issue(5)：54-59,6.DOI:10.3969/j.issn.1005-5053.2012.5.009
喷射沉积SiCp/Al-8.5Fe-1.3V-.17Si热暴露过程的显微组织演变
Microstructure Evolution of Spray Deposited SiCp/Al-8.5Fe-1.3V-1.7Si during Exposure at Elevated Temperatures
摘要
Abstract
SiCp/Al-8. 5Fe-l. 3V-1. 7Si composite prepared by spray deposition was densified by hot pressing, and then was rolled into the sheets. Evolution of second-phase dispersions, SiC/Al interface and dislocation density of the composite sheet during hot exposure were investigated, and phase transformation during hot exposure were analyzed by X-Ray Diffraction. The results showed that the dispersions kept fine without brittle phase formation and the SiC/Al interface kept clean. The second-phase grew hardly during the exposure at 500℃ for 200h. This phase grew slightly without obvious brittle phase formation during the exposure at 550℃ for 200h, while the phase coarsened rapidly when exposure temperature was above 550℃. Al4C3 phase formed near the SiC/Al interface, and dispersions grew to 400 ~500nm with Al13Fe4 phase formation after the exposing at 600T for 10 hours. Dislocation density increased along with the increase of exposure time at 550T1 . Decomposition of SiC particles results in elevated Si concentration, and restrains Al12 ( Fe, V)3Si from coarsening and transforming into Al13Fe4. The composite is characterzied with good thermal stability when exposed below 550℃ , heat resistance of the composite worsens when exposed above 550℃ , dislocation is propogated during the exposure at 550℃.关键词
喷射沉积/耐热铝合金/复合材料/热暴露/显微组织Key words
spray deposition/ heat resistant alloy/ composite/ hot exposure/ microstructure分类
矿业与冶金引用本文复制引用
贺毅强,屠宏,冯立超,杨建明,陈振华..喷射沉积SiCp/Al-8.5Fe-1.3V-.17Si热暴露过程的显微组织演变[J].航空材料学报,2012,32(5):54-59,6.基金项目
国家自然科学基金(51004050),淮海工学院人才引进科研启动基金(KQ09028) （51004050）
