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首页> 外文期刊>Materials Science and Engineering >Microstructure and mechanical property of directionally solidified NiAl-Cr(Mo)-(Hf, Dy) alloy at different withdrawal rates
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Microstructure and mechanical property of directionally solidified NiAl-Cr(Mo)-(Hf, Dy) alloy at different withdrawal rates

机译：定向凝固NiAl-Cr（Mo）-（Hf，Dy）合金在不同抽速下的组织和力学性能

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摘要

The microstructure and mechanical property of directionally solidified Ni-30.95Al-32Cr-6Mo-0.05Hf (at%)-0.1Dy (wt%) alloy were investigated by means of OM, SEM, TEM, EPMA, three-point bending tests and high-temperature tensile tests. With the withdrawal rate increasing from 6 to 120 μm/s, the microstructure changes from planar eutectic to cellular or dendritic eutectic, and both the interlamellar spacing and eutectic cell size decrease gradually. The relation between interlamellar spacing and withdrawal rate can be obtained as λ = 4.55 V~(-0.40). The corresponding room temperature fracture toughness first increases and then decreases, which should be attributed to the microstructural evolution at different withdrawal rates. Moreover, some toughness mechanisms are responsible for the improvement of fracture toughness, such as crack bridging, interface debonding and microcrack linkage. The high-temperature tensile strength is low at the planar growth rate (10 μm/s), and it increases gradually with the increase of withdrawal rate. The strengthening mechanism is also discussed.
机译：通过OM，SEM，TEM，EPMA，三点弯曲试验和定向拉伸试验研究了定向凝固Ni-30.95Al-32Cr-6Mo-0.05Hf（at％）-0.1Dy（wt％）合金的组织和力学性能。高温拉伸试验。随着撤离速率从6增加到120μm/ s，微观结构从平面共晶转变为细胞或树状共晶，层间间距和共晶胞尺寸均逐渐减小。层间距与退出速率之间的关系可以通过λ= 4.55 V〜（-0.40）获得。相应的室温断裂韧性先增加然后降低，这应归因于在不同抽出速率下的微观结构演变。此外，一些韧性机制负责提高断裂韧性，例如裂纹桥接，界面剥离和微裂纹连接。高温抗拉强度在平面生长速率（10μm/ s）时较低，并且随着拉伸速率的增加而逐渐增加。还讨论了加强机制。

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  • 来源
    《Materials Science and Engineering》 |2014年第23期|113-121|共9页
  • 作者

    Lei Wang; Jun Shen; Zhao Shang; Jianfei Zhang; Yujun Du; Hengzhi Fu;

  • 作者单位

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;

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  • 正文语种 eng
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  • 关键词

    NiAl intermetallics; Microstructure; Fracture toughness; High-temperature strength;

    机译：NiAl金属间化合物;微观结构断裂韧性;高温强度;

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