论文部分内容阅读
通过光学和透射电子显微镜研究了喷射沉积Al-Fe -V -Si合金在沉积态和不同温度热挤压后的显微组织 ,发现在α-Al基体上均匀分布着高密度的细小硅化物颗粒 ,这些细小硅化物颗粒在高温挤压后仍能保持较好的稳定性 ,在提高合金高温性能中起主要作用 .在 30 0℃及其以上温度的挤压态合金中发现了一些六边形块状相 ,经分析是由于合金局部元素成分波动造成V元素的缺乏促使亚稳α -AlFeSi相矢稳转变而成 ,六边形块状相的存在是影响合金高温性能的主要原因
The microstructures of spray-deposited Al-Fe-V-Si alloy after hot extrusion in the as-deposited and different temperatures were studied by optical and transmission electron microscopy. It was found that the high-density fine silicide particles were uniformly distributed on the α-Al matrix , These fine silicide particles can still maintain good stability after high temperature extrusion and play a major role in improving the high temperature performance of the alloy.Some hexagons are found in the as-extruded alloy at 30 ℃ and above Massive phase, the analysis is due to fluctuations in the composition of the local elements caused by the V element of the lack of a stable metastable α -AlFeSi metastable hexagonal massive phase is the main reason affecting the high temperature performance of the alloy