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Thermal properties and glass-forming ability of bulk glassy alloys

大块非晶合金的热性能和玻璃形成能力

基本信息

批准号：
15360397
负责人：
WASEDA Yoshio
金额：
$ 9.09万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

Pd-based and Zr-based glassy alloys are well known to exhibit glass transition with a wide supercooled liquid region. These bulk amorphous alloys allow us to investigate thermal properties and electrical resistivity of these alloys. The main purpose of this work is to discuss the glass-forming ability of these alloys on the basis of the obtained values. The thermal diffusivity values of the alloys were measured with a laser flash technique. The electrical resistivity was measured by a direct current four probe technique. The specific heat was measured by the heat flux type differential scanning calorimeter with a triple cell system. The thermal diffusivity values of the alloys in the liquid state are summarized in the linear equations with positive temperature dependency. The lower the thermal diffusivity values of the alloys at liquidus temperature, the lower the critical cooling rate to obtain amorphous alloy becomes. Thus, the thermal diffusivity values of alloy liquids might be an indicator of their glass forming ability. The thermal diffusivity values of Zr_<55>Al_<10>Ni_5Cu_<30> alloy show positive temperature dependence in the glassy state. The thermal diffusivity values of the alloy increase suddenly at crystallization temperature (Tc). The thermal diffusivity values increase gradually showing three stages in the crystallization temperature range with increasing temperature. The electrical resistivity values suddenly decrease at Tc and gradually decrease showing same tendency of the thermal diffusivity values. The specific value of Zr_<55>Al_<10>Ni_5Cu_<30> in the glass state was measured to be 0.372 Jg^<-1>K^<-1>. The specific heat values for liquid Pd-based alloys were also obtained. These values show small negative temperature dependence. It was also suggested from analysis with Wiedemann Franz law that principal mechanism of Pd-based alloy is likely to be controlled by electron in the super cooled liquid and liquid states.

众所周知，钯基和锆基玻璃合金表现出具有宽过冷液体区域的玻璃化转变。这些大块非晶合金使我们能够研究这些合金的热性能和电阻率。这项工作的主要目的是根据获得的值讨论这些合金的玻璃形成能力。使用激光闪光技术测量合金的热扩散率值。通过直流四探针技术测量电阻率。比热通过具有三池系统的热流型差示扫描量热仪来测量。液态合金的热扩散率值总结在具有正温度依赖性的线性方程中。合金在液相线温度下的热扩散率值越低，获得非晶态合金的临界冷却速率就越低。因此，合金液体的热扩散率值可能是其玻璃形成能力的指标。 Zr_<55>Al_<10>Ni_5Cu_<30>合金的热扩散率值在玻璃态下表现出正温度依赖性。合金的热扩散率值在结晶温度（Tc）下突然增加。随着温度的升高，热扩散率值逐渐增加，在结晶温度范围内呈现出三个阶段。电阻率值在 Tc 处突然下降并逐渐下降，表现出与热扩散率值相同的趋势。测定玻璃态的Zr_ 55 Al_ 10 Ni_5Cu_ 30 的具体值为0.372Jg ^ -1 K ^ -1 。还获得了液态钯基合金的比热值。这些值显示出较小的负温度依赖性。通过Wiedemann Franz定律分析还表明，Pd基合金的主要机理很可能是在过冷液态和液态下受电子控制。

项目成果

期刊论文数量（14）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Systematic measurement of thermal diffusivity of Pd 40 Cu 40 − x Ni x P 20 ( x = 0 ,10,40) alloys in liquid, glassy, crystallized, and supercooled liquid states by the laser flash method

DOI：
10.1103/physrevb.70.174204
发表时间：
2004-11
期刊：
Physical Review B
影响因子：
3.7
作者：
T. Nishi;H. Shibata;H. Ohta;N. Nishiyama;A. Inoue;Y. Waseda
通讯作者：
T. Nishi;H. Shibata;H. Ohta;N. Nishiyama;A. Inoue;Y. Waseda

Systematic measurement of thermal diffusivity of Pd40Cu40-xNixP20(x=0,10,40) alloys in liquid, glassy, crystallize, and supercooled liquid states by the laser flash method

激光闪光法系统测量Pd40Cu40-xNixP20(x=0,10,40)合金液态、玻璃态、晶态和过冷液态的热扩散率

DOI：
发表时间：
2004
期刊：
PHYSICAL REVIEW B 70
影响因子：
0
作者：
Tadatomo SATO;Giuseppe ABREU;Ryuji KOHNO;M.Fukumoto;Tsuyoshi Nishi
通讯作者：
Tsuyoshi Nishi

3つのセルを有する熱流速型DSCを用いたPd基合融体の比熱測定

使用三池热流型 DSC 测量 Pd 基复合材料的比热

DOI：
发表时间：
2004
期刊：
日本金属学会誌 68(8)
影响因子：
0
作者：
末武正充;真鍋健一;宮本俊介;小山寛;谷上哲也;楊明;桑原正史ら;西剛史
通讯作者：
西剛史

Electrical Resistivity Measurement of Pd40Cu30Ni10P20 Alloy in Supercooled Liquid and Liquid State

Pd40Cu30Ni10P20合金过冷液态和液态电阻率测量

DOI：
发表时间：
2004
期刊：
Materials Transactions 45(8)
影响因子：
0
作者：
M.Fukumoto;I.Ohgitani;Y.Tanaka;E.Nishioka;T.Shima et al.;阿部浩也;Tsuyoshi Nishi
通讯作者：
Tsuyoshi Nishi

Electrical Resistivity Measurement of Pd40Cu30Ni1OP20 Alloy in Supercooled Liquid and Liquid State'

Pd40Cu30Ni1OP20合金过冷液态和液态电阻率测量