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Effect of Ni/Fe ratio on activation sintering and mechanical properties of molybdenum nickel iron alloy

Ni/Fe比对钼镍铁合金活化烧结及力学性能的影响

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Abstract

In order to improve the low ductility of the Mo-Ni alloy, Fe is added and the effects of Ni/Fe mass ratio on the densification behavior, microstructure evolution and mechanical properties of alloy were investigated. The experimental results show that when iron is added to 95Mo-5Ni alloy, the formation of brittle intermetallic phase δ-MoNi at the grain boundary is avoided. Meanwhile, the grain growth of Mo is also effectively inhibited in the sintering process. However, the addition of iron reduces the degree of densification of alloy since the activation effect of Ni is superior to that of Fe. From the experimental results, it could be concluded that the maximum hardness and bending strength are achieved by 95Mo-1.5Ni-3.5Fe alloy, which are HV 614 and 741 MPa, respectively. Combined with the analyses of bending fracture mechanism, the improvement relative to Mo-Ni alloy is likely attributed to the inhibition of the brittle phase.

摘要

为了改善Mo-Ni合金的低塑性,在合金中加入Fe,并研究了Ni/Fe质量比对合金致密化行为、 组织演变和力学性能的影响。结果表明,在95Mo-5Ni 合金中加入Fe,可避免晶界处脆性金属中间相 δ-MoNi 的形成,同时在烧结过程中也可以有效抑制Mo的晶粒长大。但是由于Ni 的活化效果优于Fe, Fe 的加入降低了合金的致密化程度。实验结果显示:95Mo-1.5Ni-3.5Fe 合金的硬度和抗弯强度最高, 分别为HV 614 和741 MPa。结合弯曲断裂机理分析,相对于Mo-Ni合金,性能的改善可能归因于抑制 脆性相的形成。

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Jun-ru Liu  (刘俊汝), Zhi-bo Li  (李志博), Ben Chen  (陈奔), Kuo-chih Chou  (周国治) & Guo-hua Zhang  (张国华)

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  1. Jun-ru Liu  (刘俊汝)
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Contributions

LIU Jun-ru, ZHANG Guo-hua and CHOU Kuo-chih developed the overarching research goal. LIU Jun-ru, LI Zhi-bo and CHEN Ben conducted the experiments, analyzed the test data, and wrote the initial draft of the manuscript.

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Correspondence to Guo-hua Zhang  (张国华).

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LIU Jun-ru, LI Zhi-bo, CHEN Ben, CHOU Kuo-chih and ZHANG Guo-hua declare that they have no conflict of interest.

Foundation item: Project(51734002) supported by the National Natural Science Foundation of China

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Liu, Jr., Li, Zb., Chen, B. et al. Effect of Ni/Fe ratio on activation sintering and mechanical properties of molybdenum nickel iron alloy. J. Cent. South Univ. 29, 1423–1436 (2022). https://doi.org/10.1007/s11771-022-5014-9

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