权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Phase stability and high-temperature strength of Fe aluminides with addition of 3d transition metals

添加 3d 过渡金属的铁铝化物的相稳定性和高温强度

基本信息

批准号：
09650759
负责人：
NISHINO Yoichi
金额：
$ 2.18万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

The relation between the phase stability and high-temperature strength has been investigated for the pseudobinary (FeィイD21-xィエD2MィイD2xィエD2)ィイD23ィエD2Al alloys with addition of transition metals M = Ti, V, Cr, Mn and Mo. The substitution of these transition elements results in a remarkable stabilization of the D0ィイD23ィエD2 phase, as proved by an increase in the long-range order parameter and also a coarsening of the D0ィイD23ィエD2 antiphase domains. The rapid increase in the D0ィイD23ィエD2-B2 transformation temperature, ΤィイD2cィエD2, determined from electrical resistivity measurements, can be explained by the electron concentration effect due to the site preference of the substituted atoms. Vickers microhardness measurements show that the present pseudobinary alloys exhibit a significant improvement in the high-temperature strength up to 1000Κand above. Moreover, according to compression tests, a slight substitution of V and Mo induces a sharp decrease in the room-temperature yield stress. Further addition induces an increase in the yield stress due to solid-solution strengthening for Μ = V : precipitation strengthening can also be found for Μ = Mo. As the temperature is raised above 600Κ, the yield stress increases and exhibits a peak at higher temperatures with increasing ΤィイD2cィエD2 by the V and Mo substitution. It is also found that the strain rate sensitivity rises sharply when the peak temperature is reached, whilst it is near zero at lower temperatures. We conclude that, for Μ = V and Mo, the peak temperature varies with the increase ΤィイD2cィエD2, which supports a direct correlation between the loss of D0ィイD23ィエD2 order and the anomalous increase in yield stress.

研究了添加过渡金属 M = Ti、V、Cr、Mn 和 Mo 的准二元 (FeィイD21-xィエD2MィイD2xィエD2)ィイD23ィエD2Al 合金的相稳定性和高温强度之间的关系。这些过渡元素的替代导致了显着的稳定性D0ィイD23ィエD2相，如通过长程有序参数的增加以及 D0ィイD23ィエD2 反相域的粗化证明了这一点。通过电阻率测量确定的 D0ィイD23ィエD2-B2 转变温度 ΤィイD2cエD2 的快速增加可以通过由于取代原子的位点偏好而产生的电子浓度效应来解释。维氏显微硬度测量表明，本发明的准二元合金在高达1000K及以上的高温强度方面表现出显着的改善。此外，根据压缩测试，V和Mo的轻微替代会导致室温屈服应力急剧下降。进一步添加会因 M = V 的固溶强化而导致屈服应力增加：对于 M = Mo 也可以发现沉淀强化。当温度升高到 600Κ 以上时，屈服应力增加，并在较高温度下随着 V 和 Mo 替代而增加 ΤィイD2cィD2，并在较高温度下呈现峰值。研究还发现，当达到峰值温度时，应变率灵敏度急剧上升，而在较低温度下则接近于零。我们得出的结论是，对于 M = V 和 Mo，峰值温度随着 ΤィイD2cィエD2 的增加而变化，这支持 D0ィイD23ィエD2 阶数的损失与屈服应力的异常增加之间的直接相关性。