研究了定向凝固NiAl-15Cr合金的显微组织和高温拉伸变形行为. 结果表明: 定向凝 固Ni-25Al-15Cr合金由β-NiAl枝晶干、γ/γ' 枝晶间相和γ' 过渡层组成. 合金在1123--1373 K、 初始应变速率为1.67×10 -4--1.67×10 -2 s-1 的条件下表现出超塑性变形行为. 在1323 K和 初始应变速率为8.35×10 -3 s-1 条件下获得的最大延伸率为280%, 应变敏感指数m为0.22. 通过变形过程中显微组织观察, 对其超塑性变形行为的机理进行了初步的讨论.
The microstructure and deformation behavior of high temperature tension of a directionally solidified (DS) NiAl-15Cr alloy have been investigated. The results reveal that the microstructure consists of dendritic β-NiAl phase, interdendritic γ/γ' phase and transient layer γ' phase. The alloy shows superplastic behavior when it is deformed under the conditions of temperature range of 1123--1373 K and initial strain rate range of 1.67×10 -4--1.67×10 -2 s-1. The maximum elongation of 280% with m=0.22 is obtained at 1323 K and an initial strain rate of 8.35×10 -3 s-1. The superplastic mechanism for the alloy is also discussed by the observation of the microstructures evolution during the superplastic deformation process.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] |
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