Measurement of Intrinsic Mechanical Properties of Brittle Metallic Materials with Ideally Clean Surface and Approach to Environmental Brittlement
具有理想清洁表面的脆性金属材料的固有机械性能的测量和环境脆化的方法
基本信息
- 批准号:07455279
- 负责人:
- 金额:$ 4.93万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:1995
- 资助国家:日本
- 起止时间:1995 至 1996
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Recently, it has been revealed that mechanical properties of metallic materials are strongly dependent on the surface conditions of specimens and on the test environments as well. The purposes of this research are to get intrinsic mechanical properties of metals and alloys and also to get information of environmental brittlement. For these purposes a new tensile test machine was made. It was equipped with an ultra-high vacuum chamber and an Ar ion gun to clean the specimen surface by etching. With this machine, tensile tests were carried out by controlling the specimen surface-state and the test atmosphere in an ideal manner as much as possible.Materials used in this study were five pure metals, Cr, Mo, Ti, Ni, Al, and two alloys, Ti-6%Al-4%V and Fe-3%Si. Except for T-6%Al-4%V,all the specimens were single crystals. A series of experiments was carried out using the specimens with and without surface etching. In addition, the DV-Xalpha molecular orbital calculation was performed to simulate the electronic states of impurity elements, H,O,N,C and B in Cr.The results obtained in this study were summarized as follows ;(1) The existence of oxide films such as NiO on Ni, Al_2O_3 on Al and Fe_2O_3 on Fe-3%Si, was identified by the X-ray photoelectron spectroscopy. The yield stress and tensile stress of bulk metals and alloys were sensitive to the existence of such thin oxide or oxide-like films on the surface. Both the intrinsic yield and tensile stresses of most metals and alloys were supposed to be higher than the reported values which have been obtained by a conventional mechanical test in air using the specimens coated with some oxide films.(2) It was found from the calculation that impurity elements such as B and C tended to make the strong covalent bond with Cr and to affect the mechanical properties of Cr metal.
近年来研究表明,金属材料的力学性能与试样的表面状态和试验环境有很大的关系。本研究的目的是获得金属和合金的本征力学性能,同时也获得环境脆性信息。为此,制造了一种新的拉伸试验机。它配备了一个超高真空室和一个Ar离子枪,通过蚀刻清洁样品表面。采用Cr、Mo、Ti、Ni、Al五种纯金属和Ti-6%Al-4%V、Fe-3%Si两种合金,通过尽可能理想地控制试样表面状态和试验气氛,进行拉伸试验。除T-6%Al-4%V外,其余试样均为单晶。使用表面蚀刻和未蚀刻的试样进行了一系列实验。另外,还利用DV-X α分子轨道方法模拟了Cr中杂质元素H、O、N、C和B的电子态,得到了如下结果:(1)X射线光电子能谱证实了Ni表面NiO、Al表面Al_2O_3和Fe-3%Si表面Fe_2O_3等氧化膜的存在。大块金属和合金的屈服应力和拉伸应力对表面上这种薄的氧化物或类氧化物膜的存在敏感。大多数金属和合金的本征屈服应力和拉应力都高于用氧化膜试样在空气中进行常规力学试验所得到的值。(2)计算结果表明,杂质元素B、C等易与Cr形成较强的共价键,影响Cr金属的力学性能。
项目成果
期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
M.Morinaga, Y.Murata, M.Furui and T.Wada: "Large Enhancement of Yield Stress of Metals by Surface Etching in Ultra-High Vacuum" Scripta Metallurgica et Materialia. (in press).
M.Morinaga、Y.Murata、M.Furui 和 T.Wada:“通过超高真空中的表面蚀刻大幅增强金属的屈服应力”Scripta Metallurgica et Materialia。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
M. Morinaga, Y. Murata, M. Furui and T. Wada: "Large Enhancement of Yield Stress of Metals by Surface Etching in Ultra-High Vacuum" Scripta Metallurgica et Materialia. (印刷中).
M. Morinaga、Y. Murata、M. Furui 和 T. Wada:“通过超高真空表面蚀刻大幅增强金属的屈服应力”Scripta Metallurgica et Materialia(印刷中)。
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- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
M.Morinaga,Y.Murata,M.Furui and T.Wada: "Large Enhancement of Yield Stress of Metals by Surface Etching, in Ultra-High Vacuum" Scripta Metallurgica et Materialia. (発表予定).
M.Morinaga、Y.Murata、M.Furui 和 T.Wada:“超高真空中通过表面蚀刻大幅增强金属的屈服应力”Scripta Metallurgica et Materialia(待提交)。
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MORINAGA Masahiko其他文献
MORINAGA Masahiko的其他文献
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{{ truncateString('MORINAGA Masahiko', 18)}}的其他基金
Energy Expression of the Chemical Bond between Atoms in Rare Earth Metal Compounds and Its Application to the Design of Hydrogen Storage Materials
稀土金属化合物原子间化学键的能量表达及其在储氢材料设计中的应用
- 批准号:
16K06711 - 财政年份:2016
- 资助金额:
$ 4.93万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Approach to the Understanding of Hydrogen Embrittleness of Steels Using Energy Expression of the Chemical Bond and Its Application to Quantum Alloy Design
利用化学键能量表达理解钢氢脆性的方法及其在量子合金设计中的应用
- 批准号:
22560658 - 财政年份:2010
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$ 4.93万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Versatile Analyses in Atomic Scale of Metals and Alloys with High-Density Lattice Defects
具有高密度晶格缺陷的金属和合金原子尺度的多功能分析
- 批准号:
18062003 - 财政年份:2006
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$ 4.93万 - 项目类别:
Grant-in-Aid for Scientific Research on Priority Areas
A unified understanding of the chemical bond in hydrogen storage materials by electron density distributions and its application to quantum materials design
通过电子密度分布统一理解储氢材料中的化学键及其在量子材料设计中的应用
- 批准号:
17106008 - 财政年份:2005
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$ 4.93万 - 项目类别:
Grant-in-Aid for Scientific Research (S)
Nature of chemical bond in view of electron density distributions and a new expression for cohesive mechanism between atoms in metalcompounds
从电子密度分布来看化学键的性质以及金属化合物中原子间内聚机制的新表达
- 批准号:
14205091 - 财政年份:2002
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$ 4.93万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Degradation of alloy properties by super purification and optimum design of advanced steels by the best use of impurity elements
通过超净化降低合金性能,并通过杂质元素的最佳利用来优化设计先进钢
- 批准号:
11305050 - 财政年份:1999
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$ 4.93万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Characteristics of hydrogen storage alloys in view of molecular orbital method and design of magnesium-based alloys with high hydrogen capacity
分子轨道法储氢合金特性及高氢容量镁基合金设计
- 批准号:
09450260 - 财政年份:1997
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$ 4.93万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Molecular Orbital Approach to the Design of Corrosion Resistant Zirconiuim Alloys for Nuclear Applications
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- 批准号:
07555500 - 财政年份:1995
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$ 4.93万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Glassy embrittlement of chromium metal and its improved ductility by alloying elements
铬金属的玻璃脆化及其通过合金元素改善的延展性
- 批准号:
05650671 - 财政年份:1993
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$ 4.93万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
An Electronic Approach to the Prediction of the Mechanical Properties of Aluminium Alloys and its Application to the Design of High Strength Alloys
预测铝合金机械性能的电子方法及其在高强度合金设计中的应用
- 批准号:
04555172 - 财政年份:1992
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$ 4.93万 - 项目类别:
Grant-in-Aid for Developmental Scientific Research (B)
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