金相观察表明，形貌不规则的B4 C颗粒随机分布在2009Al基体中，分布比较均匀，颗粒尺寸大约为7μm。利用透射电子显微镜对复合材料的微观形貌进行观察发现，大部分B4 C颗粒和2009Al基体的界面平直、干净，只有在少数颗粒的尖角处发现Al3 BC的产生，这表明B4 C/2009Al系统比较稳定，界面结合良好。复合材料的屈服强度和抗拉强度都有了显著的提高，结合拉伸断口分析可知B4 C颗粒断裂是复合材料拉伸失效的主要原因，此外还发现有少量界面脱粘现象。
The metallographic observations revealed that the irregular shaped B4 C particles in sizes of about 7μm were distributed in the 2009Al matrix randomly and uniformly. In addition,the microstructures of composite were observed by transmission electron microscope. Most of the interfaces between B4 C particles and 2009Al matrix were very clean and straight,though a few of Al3 BC could be found nearby the sharp corner of B4 C particles. It was indi-cated that the B4 C/2009Al system was stable relatively and the interfacial bonding was good. And,the improved yield and tensile strength of the composites were consistent with the previous conclusion. Further,the fractograph analyses revealed that the tensile failure was attributed to the fracture of B4 C particles primarily though a few of in-terfacial decohesion could be found.
参考文献
| [1] | S.C. Tjong;G.S. Wang;Y-.W. Mai.High cycle fatigue response of in-situ Al-based composites containing TiB_2 and Al_2O_3 submicron particles[J].Composites science and technology,200510(10):1537-1546. |
| [2] | 邹利华;樊建中;左涛;马自力;魏少华.粉末冶金15%SiCp/2009Al复合材料的高周疲劳性能[J].中国有色金属学报,2010(10):1955-1961. |
| [3] | 周云峰;毛昌辉;杨剑;梁秋实;刘坤.WCp/2024Al复合材料疲劳性能研究[J].稀有金属,2010(6):870-874. |
| [4] | GANG LIU;J.K.SHANG.FATIGUE CRACK TIP OPENING BEHAVIOR IN PARTICULATE REINFORCED A1-ALLOY COMPOSITES[J].Acta materialia,19961(1):79-91. |
| [5] | 黎常浩;陈振华;陈鼎;李微.喷射沉积SiCp/Al-20Si复合材料高周疲劳行为研究[J].机械工程学报,2012(10):40-44. |
| [6] | 李微 .喷射沉积SiCp/Al-Si复合材料的疲劳行为研究[D].湖南大学,2011. |
| [7] | 邹利华;樊建中;左涛;张琪;魏少华.SiC颗粒对SiC_p/2009Al复合材料疲劳短裂纹扩展的影响[J].中国有色金属学报,2009(10):1795-1801. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%