[1]李召明,姜海昌,王昀立,等.含钪7N01铝合金中Al3(Sc, Zr, Ti)相的析出及其作用机制[J].中国材料进展,2019,(08):787-792.[doi:10.7502/j.issn.1674-3962.201803019]
　LI Zhaoming,JIANG Haichang,WANG Yunli,et al.The Precipitation and Functional Mechanism of Al3(Sc, Zr, Ti) Phase in 7N01 Aluminum Alloy with Sc Addition[J].MATERIALS CHINA,2019,(08):787-792.[doi:10.7502/j.issn.1674-3962.201803019]
点击复制

含钪7N01铝合金中Al3(Sc, Zr, Ti)相的析出及其作用机制()
分享到：

中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
期数:
2019年第08期
页码:
787-792
栏目:
前沿综述
出版日期:
2019-08-30

文章信息/Info

Title:
The Precipitation and Functional Mechanism of Al3(Sc, Zr, Ti) Phase in 7N01 Aluminum Alloy with Sc Addition
作者:
李召明; 姜海昌; 王昀立; 张舵; 闫德胜; 戎利建
（中国科学院金属研究所 核材料安全与评价重点实验室，辽宁 沈阳 110016）
Author(s):
LI Zhaoming;  JIANG Haichang;  WANG Yunli;  ZHANG Duo;  YAN Desheng;  RONG Lijian
( CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China)
关键词:
7N01铝合金; 钪添加; Al3(Sc;  Zr;  Ti)相; 再结晶; 弥散强化
Keywords:
7N01 aluminum alloy;  Sc addition;  Al3(Sc;  Zr;  Ti) phase;  recrystallization;  dispersion strengthening
分类号:
TG146
DOI:
10.7502/j.issn.1674-3962.201803019
文献标志码:
A
摘要:
钪是铝合金中常见的添加元素，但关于钪在铝合金中的作用机制研究还不够深入。通过电阻炉熔炼方法制备了传统7N01铝合金与新型含钪7N01铝合金，经均匀化处理后将合金热挤压成板材并进行双级人工时效处理。采用电子背散射衍射（EBSD）和透射电镜（TEM）对比分析了传统7N01铝合金与新型含钪7N01铝合金的微观组织，对时效态热挤压板材力学性能进行了表征，并分析了合金强化的作用机制。结果表明：经470 ℃/24 h均匀化处理后，传统7N01铝合金中析出了少量的纳米Al3(Zr, Ti)相，而含钪7N01铝合金中析出了大量纳米Al3(Sc, Zr, Ti)相。这种高密度、与基体保持共格的Al3(Sc, Zr, Ti)相对晶界迁移的钉扎效果显著，明显提升了再结晶形核的临界亚晶尺寸，抑制了热挤压过程中的动态再结晶，使含钪7N01铝合金几乎由完全的纤维结构组成。同时，含钪7N01铝合金的抗拉强度和屈服强度分别较传统7N01铝合金提高了10.7%和13.3%。计算结果表明，添加钪引起7N01铝合金的细晶强化和弥散强化效果分别为7和57 MPa，强化效果主要来源于Al3(Sc, Zr, Ti)相的弥散强化。
Abstract:
Sc is a common additive element in aluminum alloys, while the functional mechanism of Sc in aluminum alloys is not completely understood. The traditional 7N01 aluminum alloy and novel Sc modified 7N01 aluminum alloy were prepared by electrical resistance furnace melting. After homogenization treatment, two kinds of 7N01 alloys were hot extruded into plates, then exposed to two-stage artificial aging. Microstructures were comparatively analyzed by electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The mechanical properties of aged hot-extruded plates were measured by electronic universal testing machine. Meanwhile, the functional mechanism to strengthen the alloy was analyzed. The results show that a small number of nanometer-sized Al3(Zr, Ti) phases are precipitated in traditional 7N01 aluminum alloy, while a large amount of nanometer-sized Al3(Sc, Zr, Ti) phases exist in 7N01 aluminum alloy with 0.12wt% Sc after homogenization treatment at 470 ℃ for 24 h. The high-density Al3(Sc, Zr, Ti) phases which are coherent with matrix have a significant pinning effect on the migration of grain boundaries. It obviously improves the critical subgrain size for recrystallization nucleating. Also, the dynamic recrystallization in the hot extruding process is effectively inhibited. As a result, 7N01 aluminum alloy with 0.12wt% Sc is almost constitutive of full fiber-like structure. At the same time, the tensile strength and yield strength of 7N01 aluminum alloy with 0.12wt% Sc are 10.7% and 13.3% higher than those of traditional 7N01 aluminum alloy. The calculated results indicate that fine-grain strengthening and dispersion strengthening caused by Sc addition are 7 and 57 MPa, respectively. The strengthening effect is mainly derived from dispersion strengthening of Al3(Sc, Zr, Ti) phases.

备注/Memo

备注/Memo:
收稿日期：2018-03-20修回日期：2018-06-04 基金项目：国家重点研发计划项目（2016YFB1200602）第一作者：李召明，男，1988年生，博士通讯作者：姜海昌，男，1977年生，研究员，Email:hcjiang@imr.ac.cn
更新日期/Last Update: 2019-09-15