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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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铸态Al-Mg-Sc-Zr合金退火过程中的硬化行为
DOI: 10.3724/SP.J.1037.2010.00645, PP. 311-316
Keywords: Al-Mg-Sc-Zr合金,退火,沉淀强化,显微组织
Abstract:
采用透射电镜、电子探针、拉伸和硬度测试等方法对铸态Al-6Mg-0.2Sc-0.15Zr(质量分数,%)合金在等温退火过程中的硬化行为进行了研究.结果表明,退火过程中Mg分布的变化对合金强度影响不大,细小、弥散的Al3(Sc,Zr)沉淀相的析出产生了显著的沉淀强化作用.合金在300℃下退火,Al3(Sc,Zr)沉淀相粗化速率较慢,经过24h处理后其直径为5nm,合金屈服强度相对退火前提高约90MPa;随着退火温度的升高,Al3(Sc,Zr)相在退火过程中发生不同程度的粗化.450℃/24h处理后沉淀相直径增大至约30nm,Al3(Sc,Zr)相引起的沉淀强化作用下降至30MPa.铸态Al-6Mg-0.2Sc-0.15Zr合金经过300℃/3h退火处理后可获得最大的沉淀强化效果.
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