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Development of a mechanical spectroscopy measurement system for an extended temperature range and its applications.

扩展温度范围的机械光谱测量系统的开发及其应用。

基本信息

批准号：
13559004
负责人：
NUMAKURA Hiroshi
金额：
$ 7.1万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13559004/
关键词：
anelasticity elastic energy loss forced-vibration method point defects diffusion atomic jumps ordered alloys intermetallic compounds 強制振動法

项目摘要

(1) Development of the systemA system for characterizing the elasticity and anelasticity of solids has been successfully developed, which works by the forced-vibration method in the frequency range between 10^<-5> Hz and 10 Hz from room temperature to 1,000℃. It measures the relation between the stress and strain (the real and imaginary parts of the complex elastic modulus) under forced torsional vibration of a rod or plate-shaped specimen, of 0.5-1 mm in thickness and 10-50 mm in length, with a strain amplitude between 10^<-5> to 10^<-4>. The measurement sequence is fully automated with a computer. With the temperature held constant, measurements are repeated with sweeping the frequency, thereby obtaining the elastic modulus and internal friction as functions of frequency. It is also capable of free-decay measurements in resonance vibration, at a constant temperature or under a steady temperature variation.(2) ApplicationsAnelastic relaxation due to jumps of antisite atoms in L1_2 ordered alloys has been measured, from which the jump rates of the atoms and the diffusion coefficients have been successfully evaluated. The relaxation effects due to stress-induced reorientation of interstitial solute atoms in bcc metals have been systematically measured, and it has been verified that the instrument can determine the relaxation strengths and relaxation rates at satisfactory accuracy.

(1)一种用于表征固体弹性和滞弹性的系统已经研制成功，该系统在室温至1,000℃的频率范围内采用强迫振动法工作，频率范围为10 <-5>~ 10 Hz。它测量在厚度为0.5-1 mm、长度为10-50 mm的杆或板形试样的受迫扭转振动下应力和应变之间的关系（复弹性模量的真实的部分和虚部），应变振幅在10 °<-5>至10 °之间<-4>。测量序列是完全自动化的计算机。在温度保持恒定的情况下，通过扫描频率重复测量，从而获得作为频率的函数的弹性模量和内摩擦。它还能够在恒温或稳定的温度变化下进行共振振动的自由衰减测量。(2)应用测量了L1_2有序合金中反位原子跳跃引起的滞弹性弛豫，成功地计算了反位原子的跳跃率和扩散系数。本文系统地测量了体心立方金属中间隙溶质原子应力诱导重取向的弛豫效应，并证实该仪器能以满意的精度测定弛豫强度和弛豫速率。