为了解混合稀土Pr/Ce变质对ADC12合金组织及性能的影响,采用光学显微镜、扫描电镜、能谱分析等手段对其进行观察和分析.结果表明:当加入质量分数0.6%的Pr/Ce时,组织中粗大的初生α-Al相枝晶已变得较为细小,甚至有些α-Al晶粒变得圆整了,富铁相则由原来的条状、块状变为颗粒状,较均匀地分布在晶粒边界上,而共晶Si相也呈细小弥散分布的颗粒状;混合稀土Pr/Ce能与该合金成分中的Al、Si、Fe、Cu 4种元素结合生成稀土金属间化合物,这些化合物在扫描电镜下呈亮白色,其形貌有针状、块状、颗粒状3种;此外,当Pr/Ce的质量分数为0.6%时,该合金具有良好的综合力学性能,其抗拉强度达到251.67 MPa,延伸率达3.04%,分别比基体合金的提高了34.91%和51.24%.
The effects of mischmetal Pr/Ce on microstructures and mechanical properties of ADC12 alloy were investigated by means of optical microscopy, scanning electron microscopy, and energy dispersive spectrometry. The experiment results show that the microstructures of the alloy can be refined significantly when 0.6wt.% Pr/Ce is added to the alloy. Coarse dendritic crystals of primary α-A1 phases are tiny, and some grains are round. The morphology of iron-rich phase is changed into particle-like shape from original strip-like shape or bulk-like shape, and distributed much uniformly in the boundarys of grains. The eutectic silicon phases become fine and dispersed granular shape. Mischmetal Pr/Ce can combine with Al, Si, Fe, Cu elements of the alloy to form rare-earth intermetallic compounds, which are shiny white under the scanning electron microscope, and with shapes of acicular, lumpish, granular. In addition, comprehensive mechanical properties of ADC12 alloy are better when the addition of Pr/Ce is 0.6wt.%. The tensile strength and elongation reach 251.67 MPa and 3.04%, respectively, which are 34.91%and 51.24% higher than that of the matrix, respectively. Cleavage surfaces of the alloy are lessened, and the dimples are increased in quantity, diminished in size, and well-distributed, showing obviously the characteristic of ductile fracture.
参考文献
| [1] | 朱明冬 .变质处理和热处理对Al-Si合金组织及性能的影响[D].哈尔滨工业大学,2013. |
| [2] | 檀廷佐 .变质及热处理对铸造铝硅合金组织及性能的影响[D].南京航空航天大学,2012. |
| [3] | HUANG Xin;YAN Hong.Effect of Trace La Addition on the Microstructure and Mechanical Property of As-cast ADC12 Al-Alloy[J].武汉理工大学学报（材料科学版）（英文版）,2013(1):202-205. |
| [4] | Min Zuo;Degang Zhao;Xinying Teng;Haoran Geng;Zhongshi Zhang.Effect of P and Sr complex modification on Si phase in hypereutectic Al-30Si alloys[J].Materials & design,2013May(May):857-864. |
| [5] | 王会阳;安云岐;李承宇;晁兵.稀土在铝和铝合金中应用的研究及进展[J].稀土,2012(1):74-80. |
| [6] | 范理;郝启堂;韩文科.RE对铸造铝铜合金显微组织及力学性能的影响[J].铸造技术,2013(8):958-960. |
| [7] | 李海;杨迎新;郑子樵;王芝秀.少量Sc对7055铝合金组织与性能的影响[J].材料科学与工艺,2006(1):46-49. |
| [8] | Xiaowu Hu;Fugang Jiang;Fanrong Ai.Effects of rare earth Er additions on microstructure development and mechanical properties of die-cast ADC12 aluminum alloy[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2012:21-27. |
| [9] | 雷文魁;王顺成;郑开宏;张志敏;丁俊旺;翟元辉.La,Ce混合稀土对6201电工铝合金组织性能的影响[J].材料研究与应用,2015(1):20-24. |
| [10] | 唐小龙;彭继华;黄芳亮;许德英;杜日升.混合稀土含量对A356铝合金组织结构的影响[J].中国有色金属学报,2010(11):2112-2117. |
| [11] | 胡慧芳;李华基;孔凡校.混合稀土变质高硅铝活塞合金[J].铝加工,2008(3):19-21. |
| [12] | Qju Hongxu;Yan Hong;Hu Zhi.Effect of samarium (Sm) addition on the microstructures and mechanical properties of Al-7Si-0.7Mg alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2013:77-81. |
| [13] | 秦肖 .稀土Er对1420铝锂合金组织和性能的影响[D].北京工业大学,2004. |
| [14] | K. Nogita;H. Yasuda;M. Yoshiya.The role of trace element segregation in the eutectic modification of hypoeutectic Al-Si alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,20102(2):415-420. |
| [15] | Di Xu;Vinay Sriram;Vidvuds Ozolins;Jenn-Ming Yang;K.N. Tu;Gery R. Stafford;Carlos Beauchamp;Inka Zienert;Holm Geisler;Petra Hofmann;Ehrenfried Zschech.Nanotwin formation and its physical properties and effect on reliability of copper interconnects[J].Microelectronic engineering,200810(10):2155-2158. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%