+高级检索
水冷铜模中Ni-(50-x)Al-xSc合金凝固组织及性能
作者:
作者单位:

河南理工大学 材料科学与工程学院

作者简介:

通讯作者:

中图分类号:

TG132.3+2

基金项目:

国家自然科学基金(51571086, 51271073);河南理工大学自然科学基金(B 2010-20)


Microstructures and Mechanical Properties of Ni-(50-x)Al-xSc Alloys solidified in water-cooled copper mold
Author:
Affiliation:

School of Materials Science and Engineering,Henan Polytechnic University

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    用真空电弧炉在水冷铜模亚快速凝固条件下制备Ni-(50-x)Al-xSc(at%)合金,用光学显微镜(OM)和扫描电子显微镜(SEM)观察合金组织,用X射线衍射(XRD)和能谱(EDS)分析合金的相组成,结合差式扫描量热法(DSC)分析合金凝固过程,用维氏显微硬度计和纳米压痕仪分别测定合金的硬度和弹性模量,采用两相系统简化模型估算合金整体弹性模量。结果表明,Ni-50Al、Ni-45Al-5Sc、Ni-40Al-10Sc和Ni-35Al-15Sc合金的亚快速凝固组织分别为NiAl、NiAl+AlNi2Sc、NiAl+AlNi2Sc和NiAl+AlNi2Sc+(AlNi2Sc+Ni-16.93Al-21.53Sc)。合金中各相析出的先后顺序为NiAl、AlNi2Sc和(AlNi2Sc+Ni-16.93Al-21.53Sc)。AlNi2Sc生长的Jackson因子α = 0.2,凝固界面是粗糙界面。Sc使初生NiAl相的硬度提升,AlNi2Sc相的硬度大于NiAl相的硬度。Sc使初生NiAl相弹性模量减小,Ni-(50-x)Al-xSc合金的整体弹性模量与NiAl金属间化合物相比有减小。

    Abstract:

    Ni-(50-x)Al-xSc (at%) alloys were prepared by using vacuum arc smelting furnace with a water-cooled copper mold. The microstructures of the alloys were observed by optical microscope and scanning electron microscope (SEM). The phases of the alloys were analyzed by X-ray diffraction (XRD) and energy spectrum (EDS). The solidification processes of the alloys were analyzed based on scanning calorimetry (DSC) analyzing results. The mechanical properties of the alloys were analyzed by micro Vickers hardness test and nanoindentation test. With the two-phase system simplified model, the overall elastic moduli of the alloys were estimated. The results show that the sub-rapid solidification structures of Ni-50Al, Ni-45Al-5Sc, Ni-40Al-10Sc and Ni-35Al-15Sc alloys are NiAl, NiAl+AlNi2Sc, NiAl+AlNi2Sc and NiAl+AlNi2Sc+(AlNi2Sc+Ni-16.93Al-21.53Sc), respectively. The precipitation ordered of each phase in the alloys are in the ordered of NiAl, AlNi2Sc and (AlNi2Sc+Ni-16.93Al-21.53Sc) accordingly. The value of crystal growth Jackson factor of AlNi2Sc compound was α = 0.2, which is much smaller than 2, which means AlNi2Sc phase growths in a continuous manner and a coarse solid/liquid interface. The hardness of the primary NiAl phase is increased by alloying with Sc element and the hardness of the secondary phase AlNi2Sc is greater than the primary NiAl phase. Therefore, the hardnesses of the Ni-(50-x)Al-xSc alloys increased. Alloying with Sc can reduce the elastic modulus of the primary NiAl phase, and the overall elastic moduli of Ni-(50-x)Al-xSc alloys decrease compared with that of the NiAl intermetallic compound.

    参考文献
    相似文献
    引证文献
引用本文

雷鸣科,郭学锋,吴亚丽,崔红保,于合帅.水冷铜模中Ni-(50-x)Al-xSc合金凝固组织及性能[J].稀有金属材料与工程,2020,49(9):3209~3217.[Lei Mingke, Guo Xuefeng, Wu Yali, Cui Hongbao, Yu Heshuai. Microstructures and Mechanical Properties of Ni-(50-x)Al-xSc Alloys solidified in water-cooled copper mold[J]. Rare Metal Materials and Engineering,2020,49(9):3209~3217.]
DOI:10.12442/j. issn.1002-185X.20190725

复制
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2019-09-05
  • 最后修改日期:2019-12-10
  • 录用日期:2019-12-11
  • 在线发布日期: 2020-10-15
  • 出版日期: