铸态和<strong>T6</strong>热处理<strong>Al-Si-Cu-Ni-Ce-Cr</strong>铸造耐热铝合金的组织和力学性能

doi:10.11901/1005.3093.2018.693

材料研究学报

2019, Vol. 33

Issue (8): 588-596 DOI: 10.11901/1005.3093.2018.693

研究论文

本期目录 | 过刊浏览

铸态和T6热处理Al-Si-Cu-Ni-Ce-Cr铸造耐热铝合金的组织和力学性能

赵天佑,郭二军,冯义成(

),赵思聪,付原科,王丽萍

哈尔滨理工大学材料科学与工程学院哈尔滨 150040

Microstructure and Mechanical Properties of as Cast and Heat-treated Al-Si-Cu-Ni-Ce-Cr

Tianyou ZHAO,Erjun GUO,Yicheng FENG(

),Sicong ZHAO,Yuanke FU,Liping WANG

School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China

引用本文:

赵天佑, 郭二军, 冯义成, 赵思聪, 付原科, 王丽萍. 铸态和T6热处理Al-Si-Cu-Ni-Ce-Cr铸造耐热铝合金的组织和力学性能[J]. 材料研究学报, 2019, 33(8): 588-596.
Tianyou ZHAO, Erjun GUO, Yicheng FENG, Sicong ZHAO, Yuanke FU, Liping WANG. Microstructure and Mechanical Properties of as Cast and Heat-treated Al-Si-Cu-Ni-Ce-Cr[J]. Chinese Journal of Materials Research, 2019, 33(8): 588-596.

全文: PDF(30248 KB) HTML

摘要:

使用OM、SEM观察、XRD物相分析和拉伸性能测试等手段研究了铸态、固溶态和时效Al-Si-Cu-Ni-Ce-Cr铸造耐热铝合金的组织和力学性能。结果表明：对Al-Si-Cu-Ni-Ce-Cr合金进行490℃×2 h+520℃×2 h双步固溶处理，不仅使θ-Al₂Cu相完全固溶进基体中，还使更多的γ-Al₇Cu₄Ni相和δ-Al₃CuNi相充分固溶进基体中，实现了更好的固溶效果；经过490℃×2 h+520℃×2 h和185℃×6 h热处理后，Al-Si-Cu-Ni-Ce-Cr合金的室温抗拉强度为336.8 MPa、高温(300℃)抗拉强度为153.3 MPa，比铸态分别提高了74%和19.3%。

关键词 ：金属材料, 显微组织, 力学性能, 耐热铝合金, 固溶处理, 时效处理

Abstract：

The microstructure and mechanical properties of Al-Si-Cu-Ni-Ce-Cr alloy after different heat treatment were investigated by optical microscope, scanning electron microscope, X-ray diffraction and universal tensile testing. Results show that the θ-Al₂Cu phase completely dissolved into the matrix and the γ-Al₇Cu₄Ni and most of the δ-Al₃CuNi phases dissolved into the matrix after two steps solution treatment. When the Al-Si-Cu-Ni-Ce-Cr alloy was treated by 490°C×2 h+520°C×2 h+185°C× 6 h, the ultimate tensile strength at room temperature and 300°C is 336.8 MPa and 153.3 MPa, respectively. Compare with the as-cast Al-Si-Cu-Ni-Ce-Cr alloy, the value of tensile strength at room temperature and 300°C increases 74% and 19.3%, respectively.

Key words： metallic material microstructure mechanical property heat-resistant aluminum solid solution treatment ageing treatment

收稿日期: 2018-12-06

ZTFLH:

TG146.2

基金资助:黑龙江省自然科学基金(Nos. ZD2016011);黑龙江省自然科学基金(Nos. E2018045)

作者简介: 赵天佑，男，1994年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.693 或 https://www.cjmr.org/CN/Y2019/V33/I8/588

表1 Al-Si-Cu-Ni-Ce-Cr合金的名义化学成分(质量分数，%)

图1 拉伸试样的示意图

图2 不同状态合金的金相组织

表2 图3和图5标识区域的EDS能谱分析(原子分数，%)

图3 铸态合金的扫描电镜照片

图4 不同状态合金的XRD衍射分析

图5 固溶处理合金的扫描电镜照片

图6 时效处理合金的扫描电镜照片

图7 铸态合金中Ce的分布

图8 固溶处理后Ce的分布

图9 时效处理后Ce的分布

图10 不同状态合金的室温和高温拉伸强度

图11 不同状态合金的室温拉伸断口形貌

图12 不同状态合金的高温拉伸断口形貌

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