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

高温用陶瓷弥散TiAl基合金的结构和性能

• 批准号: 07455274
• 负责人: TSUJIMOTO Tokuzou
• 金额: $ 4.22万
• 依托单位: Ibaraki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455274/
• 关键词: reactive sintering; TiB_2; microstructure control; grain control; high temperature strength; extrusion; texture; material production; TiAl基合金; チタンボライド; 加工熱処理; 変形特性

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.

研究了反应烧结Ti-43.4at%Al-1.6at%Mn合金在添加和不添加TiB_2颗粒时的力学性能和显微组织。该材料通过热等静压（HIP）处理Ti和Al-Mn合金元素粉末的热挤压混合物来生产。在本研究中获得的实验结果如下。TiB_2颗粒的分散对1653 K热等静压艾德材料的晶粒长大有明显的抑制作用（热等静压处理的最高加热温度为1653 K）。973 K热等静压艾德化材料的密度通过随后的常压热处理而增加。当973 K热等静压艾德处理后的材料在1653 K热处理时，其密度与1653 K热等静压艾德处理的材料相当。973 K热等静压艾德处理材料在1273 K时能在较低的应力下发生变形，这使得973 K热等静压艾德处理材料的显微组织可以通过形变热处理得到广泛的控制。1653 K热等静压艾德材料的片层取向几乎平行于挤压方向。这一结果来自于塑性变形元素Ti的原始<101^^-0>纤维织构。因此，控制元素Ti粉的晶向是控制反应烧结TiAl合金片层方向的有效方法。

项目成果

T.Suzuki,Y.Tomota,T.Tsujimoto,T.Furuyama,K.Shibue: "Control of lamellar orientation in TiAl-base alloy using a combination of heavy extrusion and reactive sintering" Philosophical Magazine Letters.

T.Suzuki、Y.Tomota、T.Tsujimoto、T.Furuyama、K.Shibue：“使用重挤压和反应烧结相结合控制 TiAl 基合金中的层状取向”哲学杂志快报。

T.Suzuki, Y.Tomota, T.Tsujimoto, T.Furuyama, K.Shibue: "Control of lamellar orientation in TiAl-base alloy using a combination of heary extrusion and reactive sintering" Philosophical Magazine Letters.

T.Suzuki、Y.Tomota、T.Tsujimoto、T.Furuyama、K.Shibue：“使用热挤压和反应烧结相结合控制 TiAl 基合金中的层状取向”哲学杂志快报。