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首页> 外文会议>International Symposium on Eco-Materials Processing amp; Design; 20060108-11; Chengdu(CN) >Relationship between Microstructure and Tensile Strength in the Directionally Solidified (23-27) at. Al-Ni Alloys
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Relationship between Microstructure and Tensile Strength in the Directionally Solidified (23-27) at. Al-Ni Alloys

机译：定向凝固（23-27）时组织与拉伸强度的关系。 ％Al-Ni合金

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摘要

Directional or single crystal technique was applied to enhance the ductility, and two phases of γ (Ni) phase or β (NiAl) phase in γ'(Ni_3Al) matrix were also considered to increase the strength and ductility. In this study, directionally solidified rods were prepared at the solidification rate of 50μm/s in 23-27 at.% Al-Ni alloys, and tensile strengths of these rods were analyzed at room temperature. Directionally solidified samples showed the γ dendrite fibers formed in the Ni_3Al matrix in the hypo eutectic composition of 23 at.% Al, the γ' single phase in the eutectic composition of 24.5 at. % Al, and the β dendrite fibers in the γ' matrix in the hyper eutectic compositions of 25,26,27 at.% Al. The hypoeutectic alloy including γ dendrites with γ' matrix exhibited a large elongation of over 70% with ductile transgranular fracture at room temperature. With increasing Al contents, the γ dendritic microstructure changed to the β dendrite in the γ' matrix, which resulted in decreasing the elongation by increasing the volume fraction of the brittle β dendrites in the ductile γ' matrix.
机译：应用定向或单晶技术来提高延展性，还考虑了在γ'（Ni_3Al）基体中的两相γ（Ni）相或β（NiAl）相来提高强度和延展性。在这项研究中，定向凝固棒在23-27 at。％Al-Ni合金中以50μm/ s的凝固速率制备，并在室温下分析了这些棒的拉伸强度。定向凝固的样品显示在亚共晶成分为23 at。％Al的Ni_3Al基体中形成的γ树枝状纤维，在24.5 at。的共晶成分中的γ'单相。含量为25.26.27 at。％的Al的过共晶成分中的γ'基体中的β枝晶纤维。含γ'树枝状γ树枝晶的亚共晶合金在室温下呈现出超过70％的大伸长率，并具有延性的经晶断裂。随着Al含量的增加，γ'树枝状组织转变为γ'基体中的β树枝状晶体，这通过增加韧性γ'基质中脆性β树枝状晶体的体积分数而降低了延伸率。

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