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TOUGHENING OF BRITTLE MATERIALS BY GRAIN BOUNDARY DESIGN AND CONTROL

通过晶界设计和控制来增韧脆性材料

基本信息

批准号：
02452241
负责人：
WATANABE Tadao
金额：
$ 3.26万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02452241/
关键词：
Grain Boundary Design and Control Grain Boundary Character Distribution Intergranular Brittleness Control Brittle Materials Refractory Metal Intermetallics Ni_3Al Brittle Magnets 強磁性脆性合金 N_<i3>Al 粒界設計制御工学脆性材料の強靭化先端高温材料Ni_3Al 磁場

项目摘要

The grain boundary character distribution (GBCD) was investigated on three different types of brittle polycrystalline materials produced by different processing methods: refractory metal molybdenum, directionally solidified Ni_3Al and rapidly solidified Fe-50%Co alloy ribbon.It has been found that the grain boundary character distribution (GBCD) condition of processing and subsequent heat treatments. It has been reveal ed that intergranular brittleness can be controlled by enhancement of the frequency of low-energy boundaries which are resistant to intergranular fracture, or conversely by reduction of the frequency of high-energy random boundaries which are prone to intergranular fracture.Other microstructural factors associated intergranular brittleness have been investigated: The grain boundary correlation number and the grain boundary triple junction character have been proposed and experimentally studied for real polycrystalline materials.The modelling of fracture processes and characteristics in polycrystals has made clear that the fracture toughness and brittle-ductile transition strongly depend on the grain boundary character distribution (GBCD) and geometrical arrangements of grain boundaries. This finding has provided a strong support to the basic concept of toughening of brittle materials by grain boundary design and control achieved in this investigation. The result obtained from this work may be applied to ceramics.

本文研究了难熔金属钼、定向凝固Ni_3Al和快速凝固Fe-50%Co合金薄带三种不同加工方法制备的脆性多晶材料的晶界特征分布（GBCD）。艾德指出，通过提高抵抗沿晶断裂的低能边界的频率，或相反地通过降低倾向于沿晶断裂的高能随机边界的频率，可以控制沿晶脆性。研究了与沿晶脆性相关的其它微观结构因素：本文提出并实验研究了真实的多晶材料的晶界关联数和晶界三结点特征，对多晶材料断裂过程和断裂特征的模拟表明，多晶材料的断裂韧性和脆塑转变强烈地依赖于晶界特征分布（GBCD）和晶界的几何排列。这一发现提供了强有力的支持，脆性材料的韧化的基本概念，晶界设计和控制，在这项调查中取得的。所得结果可应用于陶瓷材料。