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首页> 外文期刊>Journal of Materials Engineering and Performance >Study on Low-Temperature Sintering Behavior of 90W-7Ni-3Fe Alloys: The Influence of Sn Addition
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Study on Low-Temperature Sintering Behavior of 90W-7Ni-3Fe Alloys: The Influence of Sn Addition

机译：90W-7NI-3FE合金低温烧结行为的研究：SN添加的影响

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摘要

In this work, we investigate low-temperature sintering behavior of the 90W-7Ni-3Fe alloy by introducing Sn. The 90W-7Ni-3Fe alloy with different Sn contents (0, 0.5, 1.0 and 1.5 wt.%) was fabricated via vacuum sintering at 1300 degrees C for 90 min. When 1 wt.% Sn was added, the liquidus temperature of the 90W-7Ni-3Fe alloy decreased from 1477 to 1265 degrees C, resulting in rapid densification (relative density increased from 77.77 to 98.59%) and an homogeneous liquid-phase sintered microstructure. Electron probe microanalysis (EPMA) and transmission electron microscopy (TEM) observations revealed that, apart from W and the gamma-(Ni, Fe) phase, a new Ni(3)Sn(2)phase appeared in the matrix phase. Furthermore, we discuss in detail the formation of the Ni(3)Sn(2)phase based on element selection theory, which can be associated with the larger atomic radius of Sn and with the negative enthalpy of mixing Sn and Ni. Excessive Sn content (1.5 wt.%) led to the increase in Ni(3)Sn(2)phase, and this deteriorated the relative density and tensile strength of the alloy. The 90W-7Ni-3Fe alloy with the addition of 1 wt.% Sn exhibited a maximum tensile strength value (710 MPa), which was much higher than that of the 90W-7Ni-3Fe alloy that was obtained at 1300 degrees C. Our findings shed light on further research directions and developed a 90W-6.3Ni-2.1Fe-1Sn alloy for low-temperature sintering.
机译：在这项工作中，我们通过引入SN调查90W-7NI-3FE合金的低温烧结行为。通过在1300℃下的真空烧结，90W-7Ni-3Fe合金在1300℃下真空烧结制造90分钟。当加入1重量％时，90W-7Ni-3Fe合金的液相温度从1477℃降低至1265℃，导致快速致密化（相对密度从77.77增加到98.59％）和均匀的液相烧结微观结构。电子探针微扫描（EPMA）和透射电子显微镜（TEM）观察显示，除了W和γ-（Ni，Fe）相中，在基质相中出现了新的Ni（3）Sn（2）相。此外，我们详细讨论了基于元素选择理论的Ni（3）Sn（2）相的形成，其可以与Sn的较大的原子半径相关联，以及混合Sn和Ni的负焓。过量的Sn含量（1.5重量％）导致Ni（3）Sn（2）相增加，这劣化了合金的相对密度和拉伸强度。加入1wt的90W-7Ni-3Fe合金。％Sn具有最大拉伸强度值（710MPa），其高于在1300℃下获得的90W-7Ni-3Fe合金的抗拉强度值调查结果在进一步的研究方向上阐明，并开发了90W-6.3NI-2.1FE-1SN合金，用于低温烧结。

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