(Al11La3+Al2O3)/Al复合材料的高温性能及其强化机制

doi:10.11901/1005.3093.2022.157

材料研究学报

2023, Vol. 37

Issue (2): 81-88 DOI: 10.11901/1005.3093.2022.157

研究论文

本期目录 | 过刊浏览

(Al₁₁La₃+Al₂O₃)/Al复合材料的高温性能及其强化机制

周聪¹^,², 昝宇宁¹^,³(

), 王东¹, 王全兆¹^,³, 肖伯律¹, 马宗义¹^,³

^1.中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016
^2.中国科学技术大学材料科学与工程学院沈阳 110016
^3.中国科学院金属研究所中国科学院核用材料与安全评价重点实验室沈阳 110016

High Temperature Properties and Strengthening Mechanism of (Al₁₁La₃+Al₂O₃)/Al Composite

ZHOU Cong¹^,², ZAN Yuning¹^,³(

), WANG Dong¹, WANG Quanzhao¹^,³, XIAO Bolv¹, MA Zongyi¹^,³

^1.Shi -Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^3.CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

周聪, 昝宇宁, 王东, 王全兆, 肖伯律, 马宗义. (Al₁₁La₃+Al₂O₃)/Al复合材料的高温性能及其强化机制[J]. 材料研究学报, 2023, 37(2): 81-88.
Cong ZHOU, Yuning ZAN, Dong WANG, Quanzhao WANG, Bolv XIAO, Zongyi MA. High Temperature Properties and Strengthening Mechanism of (Al₁₁La₃+Al₂O₃)/Al Composite[J]. Chinese Journal of Materials Research, 2023, 37(2): 81-88.

全文: PDF(13067 KB) HTML

摘要:

利用Al-La₂O₃的原位反应和粉末冶金工艺制备出(Al₁₁La₃+Al₂O₃)/Al复合材料。结果表明，高能球磨和高温烧结促进了原位反应，使Al与La₂O₃充分反应并制备出致密无缺陷的材料。对其微观组织的分析表明，微米Al₁₁La₃和纳米Al₂O₃颗粒均匀分散于基体之中。这种复合材料的室温抗拉强度为328 MPa、延伸率为10.5%，350℃的高温抗拉强度为119 MPa、延伸率为10.2%。与传统Al-Cu-Mg-Ag和Al-Si-Cu-Mg耐热铝合金相比，本文的制备的(Al₁₁La₃+Al₂O₃)/Al复合材料其高温抗拉强度提高了大约20%。这种材料的室温强化机制源于Al₁₁La₃和Al₂O₃的位错强化和载荷传递强化，而高温强化机制则源于Al₂O₃的晶界钉扎。

关键词 ：复合材料, 高能球磨, 微观组织, 力学性能

Abstract：

A (Al₁₁La₃+Al₂O₃)/Al composite was prepared by powder metallurgy process through the in-situ reaction of Al-La₂O₃. It was found that the high energy ball milling can promote the in-situ reaction and facilitate high-temperature sintering, thus a sufficient in-situ reaction between Al and La₂O₃ was achieved, and a dense and defect-free material was obtained. The microstructure analysis showed that micro-Al₁₁La₃ and nano-Al₂O₃ particles were uniformly dispersed in the matrix. The room-temperature tensile strength of the composite reached 328 MPa, the elongation was 10.5%, the tensile strength at 350℃ reached 119 MPa, and the elongation was 10.2%. Compared with the traditional Al-Cu-Mg-Ag and Al-Si-Cu-Mg heat-resistant aluminum alloys, the high-temperature tensile strength of the (Al₁₁La₃+Al₂O₃)/Al composite was enhanced by about 20%. The strengthening effect at room temperature may come mainly from the dislocation strengthening and load-transfer strengthening effect of Al₁₁La₃ and Al₂O₃, while the strengthening effect at high temperature may be ascribed to the grain boundary pinning effect of Al₂O₃.

Key words： composite high energy ball milling microstructure mechanical properties

收稿日期: 2022-03-21

ZTFLH:

TG146.2

基金资助:中核集团“青年英才”项目;国家自然科学基金(52171056);中国科学院金属研究所创新基金(2021-ZD02);辽宁省“兴辽英才计划”(XLYC1902058)

作者简介: 周聪，男，1997年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2022.157 或 https://www.cjmr.org/CN/Y2023/V37/I2/81

图1 铝粉、氧化镧颗粒和球磨粉末的形貌

图2 高能球磨粉末和复合材料的X射线衍射谱

图3 复合材料的低倍和高倍SEM照片、元素面扫和能谱分析

图4 复合材料的TEM照片

图5 纯铝基体的TEM照片和相同位置的能谱分析

图6 复合材料和铝基体的室温和350℃高温抗拉曲线

表1 复合材料和铝基体的拉伸性能

/MPa

∆ σ y m

Al₂O₃

Al₁₁La₃

∆ σ L - T

/MPa

$∆ σ O r o$

/MPa

$∆ σ G N D$

/MPa

∆ σ L - T

/MPa

$∆ σ O r o$

/MPa

$∆ σ G N D$

/MPa

表2 复合材料和铝基体的屈服强度计算

图7 复合材料的室温和350℃拉伸断口的SEM照片

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