文章摘要
尹斌,曹富荣,王顺成,等.稀土元素对连续铸挤Al-Mg-Si合金组织性能的影响[J].精密成形工程,2017,9(6):130-136.
YIN Bin,CAO Fu-rong,WANG Shun-cheng,et al.Effect of Rare Earths on Microstructure and Properties of Al-Mg-Si Alloy Processed by Continuous Casting-Extrusion[J].Journal of Netshape Forming Engineering,2017,9(6):130-136.
稀土元素对连续铸挤Al-Mg-Si合金组织性能的影响
Effect of Rare Earths on Microstructure and Properties of Al-Mg-Si Alloy Processed by Continuous Casting-Extrusion
投稿时间:2017-08-27  修订日期:2017-11-10
DOI:10.3969/j.issn.1674-6457.2017.06.024
中文关键词: 铝合金  连续铸挤  微观组织  力学性能  导电率
英文关键词: aluminum alloy  continuous casting-extrusion  microstructure  mechanical property  electrical conductivity
基金项目:国家自然科学基金(51334006)
作者单位
尹斌 1.东北大学 材料科学与工程学院沈阳 1108192.凯翼汽车有限公司安徽 芜湖 241000 
曹富荣 东北大学 材料科学与工程学院沈阳 110819 
王顺成 广东省工业技术研究院(广州有色金属研究院)金属加工与成型技术研究所广州 510650 
石路 东北大学 材料科学与工程学院沈阳 110819 
许光明 东北大学 轧制与连轧自动化国家重点实验室沈阳 110819 
温景林 东北大学 材料科学与工程学院沈阳 110819 
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中文摘要:
      目的 制备6201(Al-Mg-Si)加稀土的6种铝合金线材,以获得合金细化的组织,高的强度和导电率。方法 借助光学显微镜、透射电镜、X射线分析、扫描电镜和微机控制的拉伸机等手段,研究稀土元素La, Ce, Y, Sc, Er对连续铸挤6201铝合金微观组织、力学性能和导电性能的影响规律。结果 组织观察发现,Sc对晶粒细化效果最明显,横断面晶粒尺寸小于50 μm,Ce次之,晶粒尺寸为100 μm,添加La, Er的合金晶粒尺寸为100~150 μm,而添加Y的合金晶粒尺寸大于200 μm;对6201合金晶粒细化由强到弱的顺序为:Sc, Ce, La, Er, Y。TEM研究发现,含Ce合金中存在含Si和Ce的第二相颗粒和位错。XRD研究发现,含Ce的合金中,α-Al, Fe3Si, Al12Mg17, SiO2, AlCe3, Ce5Si3相存在。SEM断口观察发现,含Ce合金的断裂机理为韧性断裂。力学性能研究发现,含Sc的试样抗拉强度最高,为245 MPa,含Ce试样次之,为238 MPa,且含稀土元素La, Er, Y的抗拉强度均低于216 MPa,6201合金抗拉强度为192 MPa,说明稀土元素对合金具有强化作用;导电性能研究发现,添加稀土的6201合金的导电率介于43.5IACS%~48.5IACS%之间,含稀土的试样导电率低;稀土元素对导电率影响由高到低的顺序为Y, La, Ce, Er, Sc,其中Sc降低导电率的程度最大。结论 稀土元素对6201合金具有强化作用但对合金的导电率有不利影响。
英文摘要:
      The paper aims to fabricate six kinds of(Al-Mg-Si)6201 aluminum alloy wires with the addition of rare earths to obtain fine microstructure, high strength and high electrical conductivity. The influence rules of La, Ce, Y, Sc, and Er on microstructures and properties of these alloys were investigated with light microscope, transmission electron microscopy, X-ray diffract meter, scanning electron microscopy, and micro-computer controlled tensile tester. Sc had the best grain-refinement results and its grain size in cross-section was less than 50 μm; Ce ranked the second and its grain size was 100 μm. The grain sizes of the alloys with addition of La and Er were in the range of 100-150 μm. However, the grain size for Y-added alloy was more than 200 μm. Thus, the sequences of rare earth grain refinement for 6201 alloy from strong to weakness were as follows: Sc, Ce, La, Er, and Y. TEM examination revealed that second phase particles contained Si and Ce and dislocations existed in the Ce-containing alloy. XRD examination revealed that α-Al, Fe3Si, Al12Mg17, SiO2, AlCe3, and Ce5Si3 phases existed in the Ce-containing alloy. SEM fractograph observation revealed that ductile fracture was the fracture mechanism of Ce-containing alloy. Mechanical property tests shown that Sc-containing specimen exhibited the highest ultimate tensile strength (UTS) of 245 MPa. Ce-containing specimen exhibited UTS of 238 MPa. The UTS of La, Er, and Y-containing specimens were all lower than 216 MPa. The UTS of 6201 aluminum alloy was 192 MPa. These findings indicated that rare earths have strengthening effects. Electrical conductivity measurements shown that the electrical conductivities were in the range of 43.5 IACS%~48.5 IACS%, indicating low electrical conductivity. The sequences of rare earth influence on electrical conductivity from high to low were as follows: Y, La, Ce, Er, and Sc, among which Sc reduced the electrical conductivity to the greatest extent. Rare earths have strengthening effects on 6201 alloy but have an adverse influence on the electrical conductivities.
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