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Fabrication and Microstructure Control of High-temperature-resistant Light Alloys Containing Fine Intermetallic Compounds

含细金属间化合物的耐高温轻合金的制备及微观组织控制

基本信息

批准号：
05452286
负责人：
SATO Tatsuo
金额：
$ 4.1万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

Aluminum alloys containing transition elements and rare earth elements such as Zr, Sc, Y,Er and Yb were produced using DC-cast and rapid solidification techniques. Al-Li alloys containing Ag, Au, Cu and Zn were also produced. Magnesium alloys containing Y,Nd and Sm were carefully fabricated. Precipitation microstructurs, deformed and recrystallized microstructures were observed and mechanical properties at high temperatures were evaluated.In the alloys containing Sc fine Al_3Sc precipitates with the L1_3-type structure were formed at temperatures around 623K.These precipitates were found to be more effective to retardrecrystallization than Al_3Zr ones. Rapidly solidified Al-Er and Al-Yb alloys produced extremely fine compounds which are expected to be effective to improve alloy properties. The phase stability of the delta'phase in Al-Li alloys was increased with the additional elements of Ag, Au and Mg. The coarsening rate of the delta'particles was also greatly suppressed by the additions of Ag, Au and Mg.Mgalloys containing rare earth elements exhibited markedly increased age-hardening due to the precipitation of the metastable phases. The mechanical strength at high temperatures was higher than that of the conventional Mg alloys. This is explained by the suppressed cross-slip deformation in the Mg alloys containing Y,Nd and Sm.To conclude Al and Mg alloys containing transition elements and rare earth elements produce well controlled microstructures and exhibit improved mechanical properties at high temperatures.

采用直流铸造和快速凝固技术制备了含过渡元素和稀土元素Zr、Sc、Y、Er、Yb的铝合金。还制备了含有Ag、Au、Cu和Zn的Al-Li合金。制备了含Y、Nd和Sm的镁合金。在623 K左右，含Sc合金中形成了细小的Al_3Sc析出相，具有L1_3型结构，这些析出相比Al_3Zr析出相更有效地延缓再结晶。快速凝固的Al-Er和Al-Yb合金产生了极细的化合物，这些化合物有望有效地改善合金性能。添加Ag、Au和Mg元素后，Al-Li合金中δ '相的相稳定性提高。Ag、Au和Mg的加入也大大抑制了δ '颗粒的粗化速率。由于亚稳相的析出，含稀土元素的镁合金的时效硬化性能显着增强。高温下的机械强度高于常规镁合金。这是解释抑制交叉滑移变形的镁合金中含有Y，Nd和Sm。得出结论，铝和镁合金含有过渡元素和稀土元素产生良好的控制显微组织，并表现出改善的高温力学性能。