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High Temperature Strength of Al-Fe-(Cr, Mn, V)-Ti Alloys with Dispersed Quasi-Crystalline Particles Solidified by Powder Metallurgy

粉末冶金凝固弥散准晶颗粒Al-Fe-(Cr、Mn、V)-Ti合金的高温强度

基本信息

批准号：
18560687
负责人：
KIMURA Hisamichi
金额：
$ 2.44万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

Abstract of contents: Alloy design policies of Al-base alloys with high temperature strength was as follows: 1) Atomic sizes of composition elements should be widely different, 2) Alloys should be multi-components, 3) Heat of mixing among main component elements should be negative and 4) Added elements should have lower diffusion coefficient. As a result, we found that a liquid quenched Al-Fe-Cr-Ti-Co-Mo alloy system have a certain composition range where the fine particles of quasi-crystals are dispersed in fcc-Al phase.Rapidly quenched alloy powder of the above composition (content of Al was 93-95 at%) was solidified by PM under conditions of extrusion temperature = 673 K and extrusion ratio = 11. The high temperature strength of thus prepared PM alloy was excellent showing the tensile strength (σuts) of >300 MPa and >150 MPa at 573 K and 673 K, respectively. Transmission electron microscopy (TEM) showed that quasi-crystallites of about 100 nm in size with high temperature stability and high hardness were dispersed in the fcc Al-phase. The high temperature strength was attributed to the structure observed by TEM. Especially, ours of Al_<93>Fe_<2.45>Cr_<2.45>Ti_<0.8>Co_<0.8>Mo_<0.5> alloy was very high, that is, 364 MPa and 203 MPa at 573 K and 673 K, respectively.Significance= The target figure of the high temperature strengh of Al-alloy was >300 MPa at 573 K. The high temperature strengh of Al_<93>Fe_<2.45>Cr_<2.45>Ti_<0.8>Co_<0.8>Mo_<0.5> alloy PM material developed by present research is much higher the figure, and therefore, we attained the purpose.Importance: This developed Al-alloys having light-weight and high temperature strength can be used for the high temperature part of the transportation machines to seek the fuel cost improvement. And therefore, this developed Al-alloys are very important materials as one of candidate for the environmental problems solution.

内容提要：高温强度铝基合金的设计方针是：1)成分元素的原子尺寸应相差很大，2)合金应是多元合金，3)主要成分元素间的混合热应为负值，4)添加元素应具有较低的扩散系数。结果表明，液态淬火的Al-Fe-Cr-Ti-Co-Mo系合金具有一定的成分范围，准晶细小颗粒弥散分布在面心立方-Al相中。在挤压温度为673K、挤压比为11的条件下，用粉末冶金对上述成分(Al含量为93~95at%)的快速淬火合金粉末进行了粉末冶金凝固。制备的粉末冶金合金具有优良的高温强度，在573K和673K下的抗拉强度分别为&gT；300 Mpa和&gT；150 Mpa。透射电子显微镜分析表明，在面心立方Al相中弥散分布着尺寸约为100 nm的高温稳定性高硬度准晶。高温强度归因于用透射电子显微镜观察到的组织。特别是我们的Al_&lt；93&gt；Fe_&lt；2.45&gt；Cr_&lt；2.45&gt；Ti_&lt；0.8&gt；Co_&lt；0.8&gt；Mo_&lt；0.5&gt；合金的高温强度很高，在573K和673K时分别达到了364和203 Mpa。本研究开发的2.45&gt；Cr_&lt；2.45&gt；Ti_&lt；0.8&gt；Co_&lt；0.8&gt；Mo_&lt；0.5&gt；合金粉末冶金材料具有较高的性能指标，达到了预期目的。重要的是：研制出的轻质高温强度铝合金可用于运输机械的高温部件，以寻求燃料成本的提高。因此，这种发展起来的铝合金作为解决环境问题的候选材料之一是非常重要的。