EFFECT OF Mg AND TEMPERATURE ON Fe–Al ALLOY LAYER IN Fe/(Zn–6%Al–x%Mg) SOLID–LIQUID DIFFUSION COUPLES

2017 ◽  
Vol 24 (Supp01) ◽  
pp. 1850010
Author(s):  
LIU LIANG ◽  
YA-LING LIU ◽  
YA LIU ◽  
HAO-PING PENG ◽  
JIAN-HUA WANG ◽  
...  
Keyword(s):  
Diffusion Couple ◽  
Alloy Layer ◽  
Al Alloy ◽  
Diffusion Couples ◽  
Phase Layer ◽  
Liquid Diffusion ◽  
Time Period ◽  
Phase Layers ◽  
Diffusion Temperature ◽  
Solid Liquid

Fe/(Zn–6%Al–[Formula: see text]%Mg) solid–liquid diffusion couples were kept at various temperatures for different periods of time to investigate the formation and growth of the Fe–Al alloy layer. Scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD) were used to study the constituents and morphology of the Fe–Al alloy layer. It was found that the Fe2Al5Znxphase layer forms close to the iron sheet and the FeAl3Znxphase layer forms near the side of the melted Zn–6%Al–3%Mg in diffusion couples. When the Fe/(Zn–6%Al–3%Mg) diffusion couple is kept at 510[Formula: see text]C for more than 15[Formula: see text]min, a continuous Fe–Al alloy layer is formed on the interface of the diffusion couple. Among all Fe/(Zn–6%Al–[Formula: see text]%Mg) solid–liquid diffusion couples, the Fe–Al alloy layer on the interface of the Fe/(Zn–6% Al–3% Mg) diffusion couple is the thinnest. The Fe–Al alloy layer forms only when the diffusion temperature is above 475[Formula: see text]. These results show that the Fe–Al alloy layer in Fe/(Zn–6%Al–[Formula: see text]%Mg) solid–liquid diffusion couples is composed of Fe2Al5Znxand FeAl3Znxphase layers. Increasing the diffusing temperature and time period would promote the formation and growth of the Fe–Al alloy layer. When the Mg content in the Fe/(Zn–6%Al–[Formula: see text]%Mg) diffusion couples is 3%, the growth of the Fe–Al alloy layer is inhibited. These results may explain why there is no obvious Fe–Al alloy layer formed on the interface of steel with a Zn–6%Al–3%Mg coating.

A Solid–Liquid Diffusion Couple Study of Peritectic Reactions

Metal Science ◽  
1974 ◽  
Vol 8 (1) ◽  
pp. 112-116 ◽  
Author(s):  
A. P. Titchener ◽  
J. A. Spittle
Keyword(s):  
Diffusion Couple ◽  
Liquid Diffusion ◽  
Solid Liquid

Solid–Liquid Diffusion and Phase Growth Kinetics in Mg-Ca Binary System

2015 ◽  
Vol 816 ◽  
pp. 418-423
Author(s):  
Xin Li ◽  
Bin Jiang ◽  
Hong Yang ◽  
Xiang Sheng Xia ◽  
Jia Hong Dai ◽  
...  
Keyword(s):  
Activation Energy ◽  
Diffusion Layer ◽  
Diffusion Mechanism ◽  
Dendritic Structure ◽  
Diffusion Time ◽  
Diffusion Couples ◽  
Phase Growth ◽  
Liquid Diffusion ◽  
Solid Liquid ◽  
Exponential Relation

The solid–liquid diffusion between Mg and Mg-10 at.% Ca alloy was studied at a temperature range of 570°C to 630°C for 10, 20, 30min, respectively. Only one compound, Mg2Ca, was observed in the diffusion couples. As the diffusion time increased, the dendritic structure of the diffusion layer became coarser. The thickness of the diffusion layer had an exponential relation to the experimental temperature. The Mg2Ca phase was observed to follow parabolic growth with diffusion time, which suggested that the growth of the Mg2Ca phase was controlled by diffusion mechanism. The activation energy was determined to be 111.28 kJ/mol.

scholarly journals Interactions of Cu-substrates with titanium-alloyed Sn-Zn solders

2006 ◽  
Vol 42 (1) ◽  
pp. 45-56 ◽  
Author(s):  
D. Soares ◽  
J. Barbosa ◽  
C. Vilarinho
Keyword(s):  
Thermal Analyses ◽  
Copper Substrate ◽  
Reaction Times ◽  
Chemical Compositions ◽  
Eutectic Alloys ◽  
Diffusion Couples ◽  
Phase Layer ◽  
Cu Substrates ◽  
Series Of Experiments ◽  
Solid Liquid

The interactions of copper substrate with titanium-alloyed Sn-Zn eutectic solders have been studied. Two series of experiments have been performed. The first one consisted in differential thermal analyses of Sn-Zn nearly eutectic alloys containing from 1.3 to 2.2 wt. % Ti. Diffusion couples consisted of Cu-wires and Sn-Zn-Ti liquid solders, produced at 250 and 275 OC have been prepared in the second series,. The contact times were up to 3600 s. The contact zones have been characterized by optical and scanning electron microscope. Two layers have been found along the interfaces solid/liquid. The first and the second layers are identical, respectively, with ? and ? phases of the Cu-Zn system. No changes of the chemical compositions were detected for the tested temperatures and reaction times. Continuous parabolic growth of the total diffusion zone thickness with the time of diffusion is observed. The growth is due mainly to one the formed layers (? ) while the thickness of the ?-phase layer, stays almost constant for all tested diffusion times and temperatures.

Study on Fe–Al layers of Fe/(Zn-11%Al-3%Mg-0.2%Si) solid–liquid diffusion couples

2017 ◽  
Vol 32 (11) ◽  
pp. 1290-1295 ◽  
Author(s):  
Jianhua Wang ◽  
Kun Ma ◽  
Haoping Peng ◽  
Changjun Wu ◽  
Xuping Su
Keyword(s):  
Diffusion Couples ◽  
Liquid Diffusion ◽  
Solid Liquid

Diffusion Paths for the Formation of Half-Heusler Type Thermoelectric Compound TiNiSn

2008 ◽  
Vol 1128 ◽  
Author(s):  
Chihiro Asami ◽  
Yoshisato Kimura ◽  
Takuji Kita ◽  
Yoshinao Mishima
Keyword(s):  
Thermoelectric Properties ◽  
Single Phase ◽  
Waste Heat ◽  
Electric Energy ◽  
Diffusion Couples ◽  
Phase Layer ◽  
Equilibrium Solidification ◽  
Diffusion Paths ◽  
Solid Liquid ◽  
Ternary Peritectic Reaction

AbstractHalf-Heusler compound TiNiSn is one of the most promising candidates of thermoelectric materials which can be used to directly convert the waste heat to clean electric energy at high temperatures (around 1000 K). Thermoelectric power generation is an appealing approach for conserving energy and preserving the global environment. Half-Heusler compounds have the cubic C1b type ordered structure and show semiconducting behavior when their valence electron count (VEC) is around 18. TiNiSn is the most attractive one not only because it has excellent thermoelectric properties but also it consists of eco-friendly elements which are neither toxic nor costly. However, TiNiSn has a bothersome problem that fabrication of single phase TiNiSn alloy is quite difficult. We have found that TiNiSn phase forms by the ternary peritectic reaction. Thereby, inevitable non-equilibrium solidification results in the formation of impurity coexisting phases which tend to decrease thermoelectric properties. In the present work, to establish the basis of new fabrication processes for TiNiSn alloys, we have started from the investigation on the diffusion paths which are closely related to the formation of TiNiSn phase. The diffusion behavior was evaluated using solid/liquid diffusion couples composed of the binary Ti-Ni intermetallic compounds and Sn liquid phase, where we have selected TiNi, TiNi3 and Ti2Ni as solid phases for instance. The most interesting result is that the single-phase TiNiSn phase layer forms at the TiNi/Sn(L) interface during annealing at 1073 K for only 1 h. Moreover, faceted grains of TiNiSn single-crystal grow at the interface toward the liquid Sn phase. We have confirmed two interesting microstructural features using EBSD analyses. One is that most of these TiNiSn single-crystals have the same crystallographic orientation, and the other is that TiNiSn phase layer formed on the TiNi side of the interface consists of very fine sub-microns grains. While TiNiSn solely forms at the TiNi interface, Heusler TiNi2Sn also forms with TiNiSn at the TiNi3 interface and Ti6Sn5 tends to coexist at the Ti2Ni interface.

scholarly journals A Solid-Liquid Diffusion Couple Study of a Peritectic Reaction in Iron-Carbon System.

1993 ◽  
Vol 33 (5) ◽  
pp. 583-587 ◽  
Author(s):  
Kiyotaka Matsuura ◽  
Youichi Itoh ◽  
Toshio Narita
Keyword(s):  
Diffusion Couple ◽  
Peritectic Reaction ◽  
Liquid Diffusion ◽  
Solid Liquid ◽  
Carbon System

scholarly journals Rate of Peritectic Reaction in Iron-Carbon System Measured by Solid/Liquid Diffusion Couple Method.

1995 ◽  
Vol 35 (2) ◽  
pp. 183-187 ◽  
Author(s):  
Kiyotaka Matsuura ◽  
Hisashi Maruyama ◽  
Youichi Itoh ◽  
Masayuki Kudoh ◽  
Kuniyoshi Ishii
Keyword(s):  
Diffusion Couple ◽  
Peritectic Reaction ◽  
Liquid Diffusion ◽  
Solid Liquid ◽  
Couple Method ◽  
Carbon System

Synthesis of Cr–Si intermetallic compounds by field-activated combustion synthesis

2000 ◽  
Vol 15 (5) ◽  
pp. 1098-1109 ◽  
Author(s):  
F. Maglia ◽  
U. Anselmi-Tamburini ◽  
N. Bertolino ◽  
C. Milanese ◽  
Z. A. Munir
Keyword(s):  
Field Strength ◽  
Diffusion Couple ◽  
Combustion Synthesis ◽  
Microstructural Evolution ◽  
Combustion Front ◽  
Major Phase ◽  
Liquid Diffusion ◽  
Liquid Phases ◽  
Solid Liquid ◽  
Synthesis Reactions

The use of an electric field to activate the combustion synthesis of chromium silicides was investigated. Despite their relatively low adiabatic temperatures, all four silicides were synthesized by field-activated combustion synthesis. However, although self-propagating synthesis reactions were initiated, the products were not pure but contained other silicides and reactant phases. The purity of the samples increased with increasing field strength, and under the highest field, the products contained the desired silicide as the major phase with minor amounts of other stoichiometries. Observation of microstructural evolution in quenched reactions revealed the key role played by the liquid phases in the propagation of the combustion front. The phase Cr5Si3 was the first product of the interaction between the reactants when either solid–solid or solid–liquid processes were involved. These results were confirmed by isothermal solid–solid and solid–liquid diffusion couple experiments.

Sign in / Sign up

Export Citation Format

Share Document