| 1. | The approaches to ameliorate morphologies of primary silicon in hypereutectic al - si alloys
高硅铝合金中初晶硅形态控制研究进展 |
| 2. | Due to the hijjji cooling rate of the mlsd technology , the primary si is very fine and the distribution of si phase is uniform
由于该工艺的冷却速度较高，初晶硅十分细小且分布均匀，平均粒径为1 . 04mm左右。 |
| 3. | The microstructure of as - deposit hypereutectic ai - si - cu - mg alloy is composed of particulate - shaped si particle and equiaxed grain a - al and few interstices
多层喷射沉积高硅铝合金的显微组织由- al基体，初晶硅及孔隙组成。 |
| 4. | Adding the different amount of alloying elements mn and ti to the al - 20si - 5fe alloy makes the primary silicon and the rich iron - phase refined very well
添加不同数量的合金元素mn 、 ti后， al - 20si - 5fe合金中的初晶- si和富铁相得到了明显的细化。 |
| 5. | The second phase of alloy changes very much for the reheating . all of the primary silicon and iron - phase in al - 20si - 5fe - 3mn alloy is transformed into little well - distributed block
Al - 20si - 5fe - xti中初晶硅不仅被细化，而且趋向于球形，铁相转化为短片状。 |
| 6. | Because of the effect of sip porous skeleton , the primary si and the eutectic si were separated on the surface of sip porous skeleton under slow cooling conditions , and there were no typical eutectic microstructures in the al - alloys phase of the composites . 6
处于si相颗粒间隙的过共晶al - si合金液在缓慢冷却凝固时，初晶si和共晶si会附着在si多孔体骨架上析出，在最终的复合材料中没有典型的al - si共晶组织。 |
| 7. | Based on these parameters , the performs with the outer diameter 1200mm , the inner diameter 600mm and thickness 100mm were prepared . composition and microstructure homogeneity combined with fine primary silicon grain and uniform distribution of sic reinforced particles of 15 % were achieved
并在此工艺参数下,制备出了不同硅含量的铝基复合材料环坯,其尺寸为1200 600 100mm ,沉积坯的组织均匀、初晶硅细小,增强相sic颗粒的分布均匀,体积分数约为15 % 。 |
| 8. | The results show that , after transformation the size , shape and distribution of primary silicon in hypereutectic al - si alloy have a serious effect on the tool life and the machined surface quality of the alloy , the alloy whose primary silicon is fine , spread and dull angular has a better machinability
试验结果表明：过共晶铝硅合金经变质处理后组织中初晶硅的大小、形状和分布状况对切削刀具寿命和合金的切削加工表面质量影响极大，具有细小、分散而形状圆钝化初晶硅的合金有比较好的切削性能。 |
| 9. | The eutectic crystal al3fe often is " needle " shape or short line shape but the shape of primary crystal al3fe is relative to the adding amount of fe powder and the temperature of heat preservation stirring . while the adding amount of pure fe powder is few and the temperature of heat preservation stirring is higher than the temperature of liquidus of al - fe binary alloys equilibrium phase diagram , the reaction synthetical primary crystal al3fe exhibits short worm shape
加入量少，保温搅拌温度在al - fe二元合金液相线以上，则形成的初晶al _ 3fe呈短蠕虫状； fe加入量大，保温温度在液相线以上，初晶al _ 3fe以平面方式生长，复合材料中的初晶al _ 3fe呈块状或粒状，尺寸较大( 10 m以下) 。 |
| 10. | The experimental results show that the fraction of primary silicon grains increase with increasing of silicon content and the diameter of these grains is less than 5 m , which demonstrates a higher cooling rate ; besides , the hardness and ultimate tensile strength of composite increase with increasing of silicon content . 2
结果表明:随母合金中硅含量的增加,初晶硅的数量增加,但初晶硅尺寸均在5 m以下,这说明该工艺具有较强的快速凝固效果;另外,复合材料的硬度和抗拉强度均随硅含量的增加而增加。 |
