Structure and mechanical properties of NiAl and Ni3Al-based alloys
Structure and mechanical properties of NiAl and Ni3Al-based alloys
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DOI：
10.1016/s0020-7403(99)00087-9
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发表时间：
2000-08-01
影响因子：
7.3
通讯作者：
Wierzbinski, S
中科院分区：
文献类型：
--
作者：
Czeppe, T;Wierzbinski, S
对Ni-Al-Fe-Ti-B合金进行了研究，以确定铁和少量钛和硼的添加对相组成、显微组织和力学性能的影响，特别是在高温变形条件下。这些合金含有35.8at%的Al和3.6-8.6- 17.6at%的Fe，由高纯度组分和含有Ti（2）B颗粒的Al中间合金制备。研究了铬和铁的合金化添加对定向凝固Ni-Al-Cr-Fe合金力学性能的影响。同时添加8at%的Cr和2at%的Fe，可使合金的强度比纯Ni、Al高，但塑性因β '相的形成而降低。Ni-20 Al-8 Cr-2Fe合金的典型层状组织在高温变形过程中发生凝固。通过单轴压缩试验，确定了NiAl和Ni，Al基合金高温变形过程中的力学特性，并将其组织变化顺序与力学特性联系起来。在这些合金的应力-应变曲线上已经确定了两个加工硬化范围。发现Ni-Al-Fe-Ti-B合金变形的第一个范围对应于单个晶粒内的沿晶滑移系，而第二个范围则与穿晶滑移有关。在定向凝固Ni-20 Al-8 Cr-2Fe合金中，观察到了类似的加工硬化曲线，其显微组织从片状、椭圆形到圆形的演变过程。(C)2000爱思唯尔科技有限公司版权所有。
The investigation of Ni-Al-Fe-Ti-B alloys was carried out to determine the influence of iron and small titanium and boron additions on the phase composition, microstructure and mechanical characteristic, particularly with respect to high-temperature deformation conditions. These alloys, containing Al 35.8 at% and Fe 3.6-8.6-17.6 at% were prepared from high-purity components and Al master alloy containing Ti(2)B particles. The influence of alloying additions of chromium and iron on the mechanical properties of directionally solidified Ni-Al-Cr-Fe alloy was investigated. Additions of both Cr 8 at% and Fe 2 at% result in higher strength than exhibited by unalloyed Ni, Al. However, the ductility is reduced by the formation of the beta' phase. The typical, lamellar structure of Ni-20Al-8Cr-2Fe alloy undergoes coagulation during a high-temperature deformation process. The sequence of structural changes of NiAl and Ni, Al-based alloys has been correlated with mechanical characteristics of high-temperature deformation process, determined in uni-axial compression tests. Two ranges of work hardening have been identified on the stress-strain curves of these alloys. It has been found that the first range of the deformation of Ni-Al-Fe-Ti-B alloys corresponds to the intergranular slip system operating within individual grains, while the second one is connected with transgranular slip. In the directionally solidified Ni-20Al-8Cr-2Fe alloy similar work hardening curves were observed in relation to the microstructural evolution from the lamellae shape, through elliptical shape into circular shape. (C) 2000 Elsevier Science Ltd. All rights reserved.