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高压凝固Al2O3/Al-10Si复合材料组织热稳定性及力学性能研究
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作者单位:

1.安徽工程大学;2.衢州学院

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基金项目:

浙江省自然科学基金(LY18E010003,LQ20E010003);国家自然科学基金(51801112,51501100,51704001,);


Effect of Heat Treatment on Thermal Stability of Microstructure and Mechanical Properties of High Pressure Solidified Al2O3/Al-10Si
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Affiliation:

1.School of Mechanical and Automotive Engineering,Anhui polytechnic University;2.School of Mechanical Engineering Key Laboratory of Air-driven Equipment Technology of Zhejiang Province,Quzhou University

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    摘要:

    本文采用高压凝固的方法分别在3、4、5 GPa的压力下制备了Al2O3/Al-10Si复合材料,并分别在160 ℃保温2、4、6 h的条件下研究了高压凝固Al2O3/Al-10Si复合材料的组织热稳定性以及力学性能转变规律。研究表明:热处理导致高压凝固Al2O3/Al-10Si复合材料α相固溶的Si在热激活的作用下脱溶析出,聚集长大形成细小颗粒弥散分布于α相内,形成沉淀强化;160 ℃热处理后α相固溶的Si析出,过饱和程度下降,材料性能逐渐趋于稳定,在沉淀强化的共同作用下,Al2O3/Al-10Si复合材料抗压强度和压缩率较热处理前均有所上升。而160℃保温4 h的条件下,材料的综合力学性能最好。尤其在5 GPa压力下凝固的Al2O3/Al-10Si复合材料,抗压强度可达到716 MPa。

    Abstract:

    Al2O3/Al-10Si composites were prepared by high pressure solidification at 3, 4, 5 GPa, and then heat treated at 160 °C for 2, 4, and 6 h. Thermal stability of microstructure and mechanical properties of Al2O3/Al-10Si composites under high pressure were systematically studied. The results showed that heat treatment leads to the precipitation of Si particles due to the supersaturation in α phase.The precipitation of Si leads to a decrease of supersaturation. The compression strength and ration shows a slight increase after heat treatment due to the combination of precipitation strengthening and solid solution strengthening. At 160℃/4h, Al2O3/Al-10Si composites showed the best mechanical properties. After solidified under 5GPa and heat treatment at 160℃/4h, Al2O3/Al-10Si composites got the maximum compressive strength which is about 716MPa.

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朱冬冬,陈志鹏,王刚,董多,王晓红,张艳衡.高压凝固Al2O3/Al-10Si复合材料组织热稳定性及力学性能研究[J].稀有金属材料与工程,2020,49(9):3260~3264.[Zhu Dongdong, Chen Zhipeng, Wang Gang, Dong Duo, Wang Xiaohong, Zhang Yanheng. Effect of Heat Treatment on Thermal Stability of Microstructure and Mechanical Properties of High Pressure Solidified Al2O3/Al-10Si[J]. Rare Metal Materials and Engineering,2020,49(9):3260~3264.]
DOI:10.12442/j. issn.1002-185X.20200071

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  • 收稿日期:2020-02-07
  • 最后修改日期:2020-04-28
  • 录用日期:2020-05-08
  • 在线发布日期: 2020-10-15
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