NOVEL APPARATUS USING SCANNING LASER EXTENSOMETRY FOR HIGH-TEMPERATURE MATERIALS TESTING AND ITS APPLICATION TO MECHANICAL SPECTROSCOPY STUDIES ON METAL MATRIX COMPOSITES

新型扫描激光引伸高温材料测试装置及其在金属基复合材料力学光谱研究中的应用

• 批准号: 08555161
• 负责人: WAKASHIMA Kenji
• 金额: $ 6.46万
• 依托单位: TOKYO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08555161/
• 关键词: Scanning Laser Extensometry; High-Temperature Mechanical Testing; Cyclic Loading; Mechanical Spectroscopy; Anelasticity; Dynamic Young's Modulus; Internal Friction; Metal Matrix Composites; 低サイクル疲労; 熱疲労

In this two-year research project, supported by a Grant-in-Aid for Scientific Research (A) (2) from the Ministry of Education, Science, Sports and Culture under Contract 08555161, we have constructed a novel experimental setup for high-temperature materials testing on a standard servo-hydraulic machine ; it features a high-precision extensometric system based on a portable "scanning laser caliper" and enabls us to measure the dynamic anelastic response of a material over a temperature range from 300 to 1373 K under low-frequency (1cHz-1dHz) subrresonant conditions of cyclic uniaxial loading. Using the apparatus, the measurements of dynamic Young's modulus and internal friction have been carried out on metal-ceramic composite materials including Al-SiC,Al-9Al_2O_32B_2O_3 and Ni-ZrO_2 systems ; the experimental data on these materials all show clear evidence of anelastic relaxation in two well-separated temperature all show clear evidence of anelastic relaxation in two well-separated tem … More perature ranges, i.e.two internal friction peaks are observed together with marked decreases in dynamic Young's modulus. Kinetic aspects of these relaxation phenomena have been analyzed in detail ; this involves the determination of the activation energy and pre-exponential factor of the relaxation time from the frequency dependence of the peak-top temperature of internal friction, and the comparison of the experimentally determined kinetic parameters with predictions of theoretical models. The analysis identifies one of the observed peaks as the well-known Ke's peak due to viscous grain-boundary sliding. As a possible origin of the remaining peak, we raise the stress-directed diffusive mass flow along metal-ceramic phase boundaries, and make a micromechanics-based calculation to derive theoretical expressions for the resulting dynamic Young's modulus and internal friction of composite materials. The comparison between theory and experiment also proves the actuality of this relaxation mechanism. Less

在这项为期两年的研究项目中，得到了教育，体育和特征部合同下的科学Resilech（a）（2）的赠款的支持，我们已经为高温材料构建了一种新颖的实验设置在标准的伺服式式机器上；已经在金属陶瓷复合材料上进行，包括al-SIC，al-9AL_2O_32B_2O_3和NI-ZRO_2系统；在动态Young的模量中，观察到更多的细胞范围，即在动态Young的模量中观察到的两个。内部摩擦的峰顶温度的频率依赖性，以及对分析的预测的实验动力学参数的比较，将观察到的峰值识别为由于粘性晶粒 - 边界滑动而导致的峰值。剩下的峰值，我们提出了应力的扩散金属 - 陶瓷相边界，并使基于微力学的计算理论表达式肾脏质量较少

项目成果

C.-S.Kang: "Dynamic Young's Modulus and Internal Friction in Particulate SiC/Al Composites" Acta Materialia. 46 (in press). (1998)

C.-S.Kang：“颗粒 SiC/Al 复合材料中的动态杨氏模量和内部摩擦”Acta Materialia。

K.Wakashima: "Unsteady Diffusional Creep of a Dual-Phase Material" Scripta Materialia. 36. 1081-1087 (1997)

K.Wakashima：“双相材料的不稳定扩散蠕变”Scripta Materialia。

C.-S.Kang: "Dynamic Young's Modulus and Internal Friction in Particulate SiC/Al Composites" Acta Materialia. 46(印刷中). (1998)

C.-S.Kang：“颗粒 SiC/Al 复合材料中的动态杨氏模量和内部摩擦”Acta Materialia 46（出版中）。

T.Mori: "Steady-State Creep Rate of a Composite : Two-Dimensional Analysis" Philosophical Magazine Letters, A. 75. 359-365 (1997)

T.Mori：“复合材料的稳态蠕变率：二维分析”哲学杂志快报，A. 75. 359-365 (1997)

T. Mori: "Steady-State Creep Rate of a Composite : Two Dimensional Analysis" Philosophical Magazine Letters. 75. 359-365 (1997)

T. Mori：“复合材料的稳态蠕变率：二维分析”哲学杂志快报。