Structures and properties of ceramics dispersed TiAl-base alloys for high temperature uses

反应性交错Ti-43.4 at % Al-1.6 at %Mn合金已被测试或不被测试过的TiB_2粒子的机械和微结构特性。由HIP （热等离子压力机）生产的材料是一种热提取的钛和铝锰合金元素粉末混合物的处理。而且，实验性结果在这个调查中得到了巩固，并在随后进行。TiB_2颗粒的分化对抑制1653 K HIP'ed材料的谷物生长有影响（HIP治疗的最大升温温度为1653 K）。973 K HIP'ed材料的密度增加了大气压力下的亚序热处理。当973 K HIP'材料在1653 K处被热处理时，其密度将与1653 K HIP'ed之一相比。973 K HIP'ed材料可以很容易地在1273 K的低应用压力下改变，这使973 K HIP'ed材料的微观结构能够通过热机械治疗来广泛控制。1653 K HIP'ed材料的拉曼拉方向几乎是平行的，是向外扩散方向的。This result comes from the original <101^^-0> fiber texture of plastically deformed elem\Ti.因此，对元素钛粉的晶体方向的控制是一种有效的方法，用于控制反应性衬层的钛合金的方向。

The mechanical and microstructural properties of reactive sintered Ti-43.4at%Al-1.6at%Mn alloys with or without TiB_2 particles were examined. The materials were produced by HIP (Hot Isostatic Pressing) treatment of a hot-extruded mixture of Ti and Al-Mn alloy elemental powder. And the experimental results obtained in this investigation are concluded as follows.・The dispersion of the TiB_2 particles is effective to inhibit the grain growth of the 1653K HIP'ed material (the maximum heating temperature of HIP treatment is 1653K).・The density of the 973K HIP'ed material increased by subsequent heat treatment under atmospheric pressure. When the 973K HIP'ed material was heat treated at 1653K,the density became comparable with that of 1653K HIP'ed one.・The 973K HIP'ed material can easily deform under a low applied stress at 1273K.This enables the microstructure of the 973K HIP'ed material to be controlled widely by using thermomechanical treatment.・The lamellar orientation of 1653K HIP'ed material is almost parallel to the extrusion direction. This result comes from the original <101^^-0> fiber texture of plastically deformed elemental Ti. Therefore, the control of crystal orientation of the elemental Ti powder is an effective method of controlling the lamellar direction of reactive sintered TiAl alloy.