Study on Phase Stability of Light Weight-High Temperature LlィイD22ィエD2-AlィイD23ィエD2Ti Based Alloys.

金属复合物Al-D23-D2 Ti是一种具有吸引力的高温度结构材料，因为它相对于高熔点、低密度和良好的氧化抵抗力。However，它具有低对称性的四重奏DO D222结构，并且在环境温度非常差。一种使用低对称性晶体结构进行排序的交替金属的可能方法，可以改变这些更高对称性的结构。The DOイD222エD2 structure of AlイD23エD2Ti can be changed to the related cubic LlイイD22エD2 structure with the addition of a third element， such as Zn， Ni， Cu， or Fe。此外，对铝Ti-X的许多研究（X=Ni、Fe、Cu、Mn、Cr、Ag和Pd等）systems have focused on the mechanical properties of the ternary Ll·D22·D2 trialuminide compounds。这些（Al， X）Y D23 Y D2 Ti化合物可能具有良好的氧化抵抗力和一些导电性，因为LY D22结构有必要的五个独立滑动系统。 ... More Homogeneous deformation。The ternary Lly D22エD2 compounds， However， are brittle in tension and/or bending， although they exhibit appreciable compressive ductility at ambient temperature。最近，在微观结构上产生了大量的工作，特别是第二阶段和污染物，一般是由同源化治疗引起的，特别是由同源化治疗引起的，特别是第二阶段和污染物，一般是由同源化治疗引起的，以及与长期Ll-D22-D2 Trialuminide化合物的微结构-机械特性关系。在目前的研究中，我们报告说，Ti-9 Mn-66 Al和Ti-8 Cr-67 Al合金在环境温度下处于某些内部弯曲的导电性，Ti-14 Mn-61 Al和Ti-14 Cr-61 Al合金在弯曲中有更多的导电性，塑料丝高达0.4%和0.9%的记录，尊敬的。在这些高锰和铬含量的合金中，在同源化后没有极性被观察到。骨质疏松症的形成是由Kirkendall机制在同源化治疗期间解决的第二阶段。也是最近，在Al-Ti-Mn and Al-Ti-Cr systems were carried out to study functionally graded diffusion layers中， the respective bondings and coatings of Ll-D22-type and Ll-D20-type and Ll-D20-D2 （TiO） alloys in the Al-Ti-Mn and Al-Ti-Cr systems were carried out to study functionally graded diffusion layers。Thus the microstructure and mechanical properties of the ternary Ll D22 compound are closely associated with the composition of Ll D22/equilibrium second phases surrounding the Ll D22/D2 phase。Less（低）

The intermetallic compound AlィイD23ィエD2Ti is attractive as a potential high-temperature structural material because of its relatively high melting point, low density, and good oxidation resistance. However, it has the low-symmetry tetragonal DOィイD222ィエD2 structure and is very brittle at ambient temperature. One possible approach to ductilize ordered intermetallics with low-symmetry crystal structures is to change their structures to those of higher symmetry. The DOィイD222ィエD2 structure of AlィイD23ィエD2Ti can be changed to the related cubic LlィイD22ィエD2 structure with the addition of a third element, such as Zn, Ni, Cu, or Fe. Also, many studies on the Al-Ti-X (X=Ni, Fe, Cu, Mn, Cr, Ag and Pd etc.) systems have focused on the mechanical properties of the ternary LlィイD22ィエD2 trialuminide compounds. These (Al, X)ィイD23ィエD2Ti compounds will potentially have good oxidation resistance and some ductility because the LlィイD22ィエD2 structure has the requisite five independent slip systems required for … More homogeneous deformation. The ternary LlィイD22ィエD2 compounds, however, are still brittle in tension and/or bending, although they exhibit appreciable compressive ductility at ambient temperature. Recently, much work has been made on the microstrucure, especially second phases and porosity generally induced by a homogenization treatment, and the microstructure, especially second phases and porosity generally induced by a homogenization treatment, and the microstructure-mechanical property relationships of the ternary LlィイD22ィエD2 trialuminide compounds.In the present study, we reported that Ti-9Mn-66Al and Ti-8Cr-67Al alloys with the LlィイD22ィエD2 structure does posses some intrinsic bend ductility at ambient temperature, and Ti-14Mn-61Al and Ti-14Cr-61Al alloys are more ductile in bending, with a plastic strain to 0.4% and 0.9% being recorded, respectively. In these higher manganese and chromium content alloys, no porosity was observed after homogenization. The formation of porosity was caused by Kirkendall mechanism with the second phases solutionized during homogenization treatment. Also recently, the respective bondings and coatings of LlィイD22ィエD2-type and LlィイD20ィエD2 (TiAl) alloys in the Al-Ti-Mn and Al-Ti-Cr systems were carried out to study functionally graded diffusion layers. Thus the microstructure and mechanical properties of the ternary LlィイD22ィエD2 compound are closely associated with the composition of LlィイD22ィエD2 formation and equilibrium second phases surrounding the LlィイD22ィエD2 phase. Less