Development of the Method for the Measurement of Single Crystal Elastic Constants from Polycrystalline Specimen

多晶样品测量单晶弹性常数方法的研制

• 批准号: 06555179
• 负责人: HAYAKAWA Motozo
• 金额: $ 1.86万
• 依托单位: Tottori University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555179/
• 关键词: Actuator for X-Ray Measurement; Shape Memory Alloy; TiNi Alloy; X-ray Stress Measurement; Single Crystal Elastic Constants; X線回折用応力負荷ジグ,; 形状記憶合金,; TiNi合金,; X線応力測定,; 単結晶弾性定数,

The aim of the present research was to make an actuator for exerting a biaxial stress on a disk shaped specimen for X-ray diffractometer and utilize it for a method to determine the single crystal elastic constants from a polycrystalline specimen which is developed by Hayakawa et al. (J.Appl.Cryst.. (1985) 513-518).1. Manufacturing of an actuator of TiNi shape memory alloyA ring shaped actuator (inner diameter 18.5mm, outer diameter 22.5-28.5mm, thickness 4mm) was made of TiNi alloy. A aging treatment brought the Ms temperature below 0ﾟC and Af above room temperature. At a temperature near Ms, the inner diameter of a ring was expanded by inserting a tapered rod with a larger diameter. A disk shaped specimen was inserted in the expanded ring while keeping the temperature below Ms. A subsequent heating the ring and specimen above Af and cooling to room temperature bring the ring to the initial shape, and thus exerts a biaxial compressive stress on the inserted specimen. The applied stres … More s was obtained by the strain measured through a strain gage pasted on the specimen and Young's modulus.Different level of stress up to 250MPa could be obtained at room temperature by modifying the Ms and As temperature by changing the aging treatment and by using different thickness of the actuator.2. Measurement of single crystal elastic constants from a polycrystalline specimenOnce a few different levels of stress were applied on a polycrystalline specimens and the d-spacings from various reflections were obtained, the calculation of the single crystal clastic constants were straightforward following the recipe presented by the above mentioned paper. For an Fe-35wt%Ni, the following values were obtained :C_<11>=1.249 <plus-minus> 0.100, C_<12>=0.720 <plus-minus> 0.073, C_<44>=1.219 <plus-minus> 0.096 [10^5MPa]The results compare well with the constants obtained for an Fe-30Ni alloy from a single crystal (C_<11>=1.463, C_<12>=0.881, C_<44>=1.132 [10^5MPa]).An application for a cubic zirconia is in progress. Less

本研究的目的是制造一种用于 X 射线衍射仪的在盘形样品上施加双轴应力的致动器，并将其用于确定由 Hayakawa 等人开发的多晶样品的单晶弹性常数的方法。 (J.Appl.Cryst..(1985)513-518).1.TiNi形状记忆合金致动器的制造环形致动器(内部直径18.5mm，外径22.5-28.5mm，厚度4mm）由TiNi合金制成，时效处理使Ms温度低于0°C，Af在接近Ms的温度下，环的内径为通过插入带有较大插入件的锥形杆来膨胀，同时将温度保持在 Ms A 以下。随后将环和样品加热到 Af 直径以上并冷却至室温，使环达到初始温度。形状，从而插入对样本施加双轴压应力，通过粘贴在样本上的应变计测量的应变和杨氏模量获得施加的应力。在室温下可以获得高达250MPa的不同水平的应力。通过改变时效处理和使用不同厚度的致动器来修改Ms和As温度来测量多晶样品的单晶弹性常数。2．将应力施加在多晶样品上，并获得来自各种反射的 d 间距，按照上述论文中提出的配方，单晶弹性常数的计算很简单。对于 Fe-35wt%Ni，以下值。​得到：C_<11>=1.249<正负>0.100，C_<12>=0.720<正负> 0.073, C_<44>=1.219 <正负> 0.096 [10^5MPa]结果与单晶 Fe-30Ni 合金获得的常数 (C_<11>=1.463, C_<12>= 0.881, C_<44>=1.132 [10^5MPa]).立方体的应用氧化锆正在进行中。