Superplastisity and deformation in ceramics and cermets

陶瓷和金属陶瓷的超塑性和变形

• 批准号: 04555168
• 负责人: SAKUMA Taketo
• 金额: $ 11.58万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04555168/
• 关键词: Superplastisity; High-temperature deformation; Ceramics; Zirconia; Alumina; Cermet; サーメット; 微細結晶粒セラミックス; TZP(正方晶ジルコニア多結晶); Al_2O_3(アルミナ); WC-Co

1. The improvement of ductility is resulted from the suppression of the grain growth during high-temperature deformation. For example, which is obtained in this examination, the grain growth is inhibited and the ductility is improved largely in the case of Al2O3 with a small addition of spinel second phase.2. The systems was discovered in this study that the ductility is not improved in spite of fine grained structure. Although Al2O3-ZrO2 alloys has fine grained structure and the grain size does not increase during high-temperature deformation, the improvement of ductility could not be obtained.3. It is cleared up that the moderate addition of glass-phase has the large merit on the reduction of stress and the improvement of ductility during deformation. TZP with a small SiO2 is the example obtained in this study. In this alloy, the much large elongation more than 100% is obtained.4. In TiC-Ni based cermets, it is cleared up that Mo2C has the effect on the improvement of ductility. Moreover the relation between stress and strain rate can be described by the sigmoidal curve and that behavior cab separated into three regions. This results has the same of the WC-Co alloy's.

1。延展性的改善是由于在高温变形过程中抑制了晶粒生长。例如，在这项检查中获得的，在AL2O3的情况下，晶粒的生长受到抑制，并且在少量添加Spinel第二相中，延展性大大改善。2。在这项研究中发现该系统尽管存在精细的谷物结构，但仍未改善延展性。尽管Al2O3-ZRO2合金具有细晶粒结构，并且在高温变形期间晶粒尺寸不会增加，但无法获得延展性的改善。3。可以清楚地说，玻璃相中的中等添加对减少应力和变形过程中延性的改善具有很大的优点。具有小SIO2的TZP是本研究中获得的例子。在这种合金中，获得的大量伸长率超过100％。4。在基于TIC-NI的Cermets中，可以清除MO2C对延展性改善的影响。此外，应力与应变率之间的关系可以通过乙状结肠曲线描述，而行为驾驶室分为三个区域。该结果具有WC-CO合金的相同。

项目成果

T.Sakuma,Y.Yoshizawa and K.Okada: "Superplasticity in tetrogonal zirconic polycrystal" Ann.Chim.,Fr.18. 361-367 (1993)

T.Sakuma、Y.Yoshizawa 和 K.Okada：“四方锆多晶中的超塑性”Ann.Chim.，Fr.18。

T.Sakuma,Y.Yoshizawa and K.Okada: "High-temperature plastic flow and cavitation in fine-grained ceramics" Creep and Fracture of Engineering Materials and Structures. 305-314 (1993)

T.Sakuma、Y.Yoshizawa 和 K.Okada：“细粒陶瓷中的高温塑性流动和空化”工程材料和结构的蠕变和断裂。

T.Sakuma, Y.Yoshizawa and K.Okada: "High-temperature plastic flow and caribration of fine-grained ceramics" Creep and Fracture of Engineering Materials and Structures. 305-314 (1993)

T.Sakuma、Y.Yoshizawa 和 K.Okada：“细晶陶瓷的高温塑性流动和渗碳”工程材料和结构的蠕变和断裂。

T.Sakuma and H.Hondo: "Plastic flow in WC-13ut%Co at high tewperatures" Mater.Sci.Eng.,. A156. 125-130 (1992)

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T.Sakuma: "micrograin superplasticity in ceramics" Proc.1st Pacific Rim.Int.Conf.on Advanced Meterials and Processing. 881-886 (1993)

T.Sakuma：“陶瓷中的微晶超塑性”Proc.1st Pacific Rim.Int.Conf.on Advanced Meterials and Manufacturing。