郝雅娇,刘凯,陈立佳

• 1:沈阳工业大学材料科学与工程学院
• 2:沈阳鼓风机集团核电泵业有限公司公司核电部

摘要(Abstract)：

通过进行光学显微镜、扫描电镜观察及拉伸性能测试,研究了时效态Al-5.5Cu-0.9Mg-0.2Sc-0.15Zr-1.0Ti合金的显微组织及不同温度下的拉伸性能。结果表明:Ti元素的添加,可以在合金晶粒内部产生Al3Ti相。随着时效时间的增加该合金室温抗拉强度和屈服强度均呈先增加后降低的趋势,并在时效8 h时达到最大值。断后伸长率随时效时间的增加呈现出下降的趋势。对T6态的Al-5.5Cu-0.9Mg-0.2Sc-0.15Zr-1.0Ti合金进行高温拉伸试验,其结果表明,随着试验温度的升高,合金的拉伸强度有所下降,而断后伸长率升高。利用SEM对合金的拉伸断口形貌进行观察,结果表明,在常温拉伸加载条件下,合金的拉伸断裂方式是以脆性为主的韧脆混合断裂;在高温拉伸加载条件下,合金断口处存在大量韧窝,断裂方式为韧性断裂。比较室温拉伸与高温拉伸的拉伸断口形貌可知,合金断裂方式由韧脆混合断裂转变为韧性断裂。

关键词(KeyWords)： Al-Cu-Mg合金;时效;显微组织;拉伸性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 郝雅娇,刘凯,陈立佳

DOI: 10.13289/j.issn.1009-6264.2017-0344

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