3Ti/ADC12復(fù)合材料;顯微組織;力學(xué)性能;斷口"/> 3Ti/ADC12復(fù)合材料微觀組織及力學(xué)性能的影響。通過光學(xué)顯微鏡以及掃描電鏡觀察復(fù)合材料的微觀以及斷口組織。實(shí)驗(yàn)結(jié)果表明：Sr的加入能有效減小α-Al以及Al3Ti顆粒尺寸以及優(yōu)化材料形態(tài)。Sr的最優(yōu)加入量為0.25 wt%。在該加入量條件下,共晶硅由針狀或短棒狀變?yōu)轭w粒狀,α-A1粗枝晶得到較好的細(xì)化。實(shí)驗(yàn)結(jié)果也顯示：Sr的加入有效提升了復(fù)合材料的機(jī)械性能。當(dāng)加入0.25 wt% Sr時,抗拉強(qiáng)度以及延伸率相較于基體材料增加了36.9% 和 58%。斷口形貌表明,在最優(yōu)加入量條件下所制備的復(fù)合材料斷口幾乎看不到解理面和脆性平坦區(qū),韌窩數(shù)量增多,形貌尺寸變得更小且深,同時分布也較為均勻。斷口形貌的變化符合材料力學(xué)性能變化。"/>

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Sr對合成Al3Ti/ADC12復(fù)合材料微觀組織與力學(xué)性能的影響
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南昌大學(xué)機(jī)電工程學(xué)院材料加工工程系,南昌大學(xué)機(jī)電工程學(xué)院材料加工工程系,南昌大學(xué)機(jī)電工程學(xué)院材料加工工程系,南昌大學(xué)機(jī)電工程學(xué)院材料加工工程系

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Effect of Sr Modification on Microstructures and Mechanical Properties of Al3Ti/ADC12 Composites
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Department of Materials Processing Engineering,School of Mechanical and Electrical Engineering,Nanchang University,Department of Materials Processing Engineering,School of Mechanical and Electrical Engineering,Nanchang University,Department of Materials Processing Engineering,School of Mechanical and Electrical Engineering,Nanchang University,Department of Materials Processing Engineering,School of Mechanical and Electrical Engineering,Nanchang University

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    本文研究了不同含量的改性劑Sr對原位合成Al3Ti/ADC12復(fù)合材料微觀組織及力學(xué)性能的影響。通過光學(xué)顯微鏡以及掃描電鏡觀察復(fù)合材料的微觀以及斷口組織。實(shí)驗(yàn)結(jié)果表明：Sr的加入能有效減小α-Al以及Al3Ti顆粒尺寸以及優(yōu)化材料形態(tài)。Sr的最優(yōu)加入量為0.25 wt%。在該加入量條件下,共晶硅由針狀或短棒狀變?yōu)轭w粒狀,α-A1粗枝晶得到較好的細(xì)化。實(shí)驗(yàn)結(jié)果也顯示：Sr的加入有效提升了復(fù)合材料的機(jī)械性能。當(dāng)加入0.25 wt% Sr時,抗拉強(qiáng)度以及延伸率相較于基體材料增加了36.9% 和 58%。斷口形貌表明,在最優(yōu)加入量條件下所制備的復(fù)合材料斷口幾乎看不到解理面和脆性平坦區(qū),韌窩數(shù)量增多,形貌尺寸變得更小且深,同時分布也較為均勻。斷口形貌的變化符合材料力學(xué)性能變化。

    Abstract:

    The effects of Sr modification on the microstructure and properties of Al3Ti/ADC12 composite were systematically investigated. The microstructures and fracture surfaces of composites were examined by optical microscope and SEM. Results showed that the addition of Sr reduced the sizes of the α-Al primary phase and Al3Ti particles and modified the morphology of composites. The optimum level of added Sr content was 0.25 wt%, and the eutectic silicon changed from a acicular or short rod shape into a granule one. Coarse dendritics of the primary α-A1 phases were fully refined. Results also showed that Sr addition led to the improvement inSmechanical properties. Compared with matrix alloys, the tensile strength and elongation of the composite were increased by 36.9% and 58% when the Sr addition was 0.25 wt.%. Furthermore, fractographic examinations revealed that cleavage surfaces and brittle plain area could hardly be seen from the Al3Ti/ADC12 composite with addition of 0.25wt.% Sr. The dimples were increased in quantity and diminished in size, deeper and well-distributed. The fracture appearances matched the tendency of the tensile properties.

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吳慶捷,閆洪,劉淵,胡志. Sr對合成Al3Ti/ADC12復(fù)合材料微觀組織與力學(xué)性能的影響[J].稀有金屬材料與工程,2018,47(3):742~747.[Qing-jie Wu, Hong Yan, Yuan liu, Zhi Hu. Effect of Sr Modification on Microstructures and Mechanical Properties of Al3Ti/ADC12 Composites[J]. Rare Metal Materials and Engineering,2018,47(3):742~747.]
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  • 收稿日期:2016-05-04
  • 最后修改日期:2016-07-05
  • 錄用日期:2016-07-15
  • 在線發(fā)布日期: 2018-04-11
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