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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >An investigation of thermal aging effects on the mechanical properties of a Ni_3Al based alloy by nanoindentation
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An investigation of thermal aging effects on the mechanical properties of a Ni_3Al based alloy by nanoindentation

机译：纳米压痕研究热时效对Ni_3Al基合金力学性能的影响

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摘要

Ni_3Al-based intermetallic alloys are composed of a gamma network and gamma' domains. In general, through precipitation, the gamma' phase is used as a hardening source for this alloy. This study examined how gamma' acts as a hardening material in a cast Ni_3Al-based intermetallic alloy. Specimens cut from a centrifugally cast tube were aged in Ar at elevated temperatures for up to 1600 h. Hardness tests were then performed in air at room temperature. Vickers microhardness and nanoindentation tests were carried out on specimens aged at 900 deg C and 1100 deg C. The microstructures were examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The microhardness of bulk Ni_3Al decreased dramatically with increasing thermal aging time at 900 deg C, but the nanohardness measured by the nanoindenter did not significantly decrease. The nanohardness data suggested that the hardening effects were caused by the precipitation of the gamma' phase on the gamma and gamma' cells.
机译：Ni_3Al基金属间合金由γ网络和γ'域组成。通常，通过沉淀，γ′相被用作该合金的硬化源。这项研究检查了γ'在铸造Ni_3Al基金属间合金中如何作为硬化材料。从离心铸造管上切下的样品在氩气中在高温下老化1600小时。然后在室温下在空气中进行硬度测试。在900℃和1100℃时效的样品上进行了维氏显微硬度和纳米压痕测试。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）检查了显微组织。 Ni_3Al的显微硬度随900℃下的热老化时间的增加而急剧下降，但纳米压头测得的纳米硬度并未显着下降。纳米硬度数据表明，硬化作用是由γ′相在γ和γ′细胞上的沉淀引起的。

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