岳嵩,邓显波,张嘉艺,王斌,王海生

• 1:国网西藏电力有限公司电力科学研究院
• 2:中国电力科学研究院
• 3:中南大学材料与工程学院

摘要(Abstract)：

采用光学显微镜(OM)、扫描电镜(SEM)和透射电镜(TEM)等研究了在70 MPa的拉应力下90、120和150℃时Sc微合金化对8xxx系铝合金导线的蠕变性能及其组织形貌的影响。结果表明:在蠕变试验中,Al-0.7Fe-0.2Sc合金的稳态蠕变速率在90~150℃/70 MPa范围内为1.203×10~(-8)s~(-1)~4.346×10~(-7)s~(-1),在150℃/70 MPa下,Al-0.7Fe的稳态蠕变速率为2.027×10~(-6)s~(-1),是Al-0.5Fe-0.2Sc合金的4.6倍。Sc的添加能抑制Al_3Fe相的形核及析出。另外,在70 MPa时,低温蠕变下,Al_3Fe和Al_3Sc相的形状和尺寸没有显着变化。TEM图像显示Al_3Fe相不均匀地分布在亚晶界而不是内部晶粒中,位错环由Al_3Sc沉淀相钉扎,阻碍位错移动。

关键词(KeyWords)： Al-Fe合金;Al3Sc沉淀相;蠕变抗性;组织

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(412030003)

作者(Author): 岳嵩,邓显波,张嘉艺,王斌,王海生

DOI: 10.13289/j.issn.1009-6264.2017-0150

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