摘要
研究了不同变质剂对过共晶铝硅合金微观组织和性能的影响。结果表明:经过不同变质剂变质后,初晶硅更加细小、均匀地分布于基体中,其中Al-Cu-P变质剂变质效果最好,其初晶硅尺寸细化到25μm左右,硬度和强度均提高了20%以上。探讨了固溶和时效处理对合金微观组织的影响,经过T6处理后,析出的强化第二相均匀弥散地分布于基体中,其中经Al-Cu-P变质的合金经T6处理后,其硬度达到153HV,常温抗拉强度达到250MPa。对拉伸试样断口进行分析,发现其变质前后断裂均为脆性断裂,主要是沿晶断裂和穿晶解理断裂的交互进行。
The effects of different modifiers for hypereutectic A1-Si alloy microstructure and properties were studied. The results show that after different modification, the primary silicon is much smaller and more evenly distributed in the matrix; especially after the A1-Cu-P modification, the size of the primary silicon is down to 25 μm, and the hardness and strength are increased by 20%. The effects of the solid solution and aging treatment on the internal microstructttre of the alloy are discussed. After T6 treatment, the precipitation of strengthening second phase is homogeneously distributed in the matrix. The performance of alloy is greatly improved, especially after T6 heat treatment by the Al-Cu-P modification. The hardness reaches 153HV, the normal temperature tensile strength reaches 250 MPa. Through analyzing the fracture, the fracture is found to be brittle fracture, which is mainly intergranular fracture and transgranular cleavage fracture interaction.
出处
《热加工工艺》
CSCD
北大核心
2012年第13期33-36,共4页
Hot Working Technology
关键词
过共晶铝硅合金
变质剂
组织和性能
断口
hypereutectic A1-Si alloy
modificator
microstructure and properties
fracture
