Study of thermal stabilization of an intermetallic compound-α-Fe(Sn) solid solution layered system

2010 ◽  
Vol 109 (5) ◽  
pp. 461-468
Author(s):  
A. K. Zhubaev ◽  
V. S. Rusakov ◽  
K. K. Kadyrzhanov
Keyword(s):  
Solid Solution ◽  
Intermetallic Compound ◽  
Thermal Stabilization ◽  
Layered System

Investigation on the Diffusion Behavior of Mo-Ni Interface

2010 ◽  
Vol 152-153 ◽  
pp. 1607-1610 ◽  
Author(s):  
Wei Chan Cao ◽  
Shu Hua Liang ◽  
Yue Xin Xue ◽  
Xian Hui Wang
Keyword(s):  
Solid Solution ◽  
Diffusion Coefficient ◽  
Electron Microscope ◽  
Intermetallic Compound ◽  
Diffusion Layer ◽  
Interdiffusion Coefficient ◽  
The Self ◽  
Diffusion Behavior ◽  
Self Diffusion ◽  
Self Diffusion Coefficient

In order to gain a deep insight into the mechanism of Ni-doped Mo activated sintering process, the diffusion behavior of Mo-Ni interface was studied utilizing a Mo-Ni diffusion couple. The phase structure and composition on the diffusion layer were characterized and analyzed by means of scanning electron microscope and transmission electron microscope, the self diffusion coefficient and interdiffusion coefficient were calculated. The results show that a diffusion layer is formed between Mo and Ni after sintering at 1223k for 1h, which is comprised of a δ-NiMo intermetallic compound and a limit solid solution containing small amounts of nickel. The self diffusion coefficient and interdiffusion coefficient are 2.068×10-18cm2/s and 4.5×10-12cm2/s, respectively. It is suggested that the diffusion rate of Mo in δ-NiMo intermetallic compound and a limit solid solution containing small amounts of nickel is 106 times bigger than that of self diffusion, and the intermetallic compound layer provides a short diffusion path for Mo activated sintering.

Phase Transformations in the Zirconium-Aluminum-Hydrogen System

1975 ◽  
Vol 33 ◽  
pp. 28-29
Author(s):  
D. Faulkner ◽  
D. J. Cameron
Keyword(s):  
Solid Solution ◽  
Intermetallic Compound ◽  
Phase Transformations ◽  
Single Phase ◽  
Structural Materials ◽  
Al Alloys ◽  
Al Alloy ◽  
Hydrogen System ◽  
A Value ◽  
Al Matrix

Zr-Al alloys based on the intermetallic compound Zr3Al are presently being considered as structural materials for use in nuclear environments. Theoretically, the single-phase Zr3Al alloy should contain 8.97% Al, but in practice single phase material is not produced, and alloys containing approximately 8.0 to 8.5% Al contain a dispersion of α-Zr solid solution in the Zr3Al matrix (fig. 1). At higher Al concentrations Zr2Al may also be present.In this paper we describe the structures observed in a Zr-8.3% Al alloy containing up to 1300 μg/g hydrogen. Hydrogen was introduced into the alloy in two ways. The first technique involved the exposure of a weighed sample, at 650°C to a known volume of hydrogen at a predetermined pressure. The pressure was monitored during hydriding until it dropped to a value corresponding to the required uptake of hydrogen.

Microstructure Evolution and Hardness of AlCrFeNixMo0.2 High Entropy Alloy

2016 ◽  
Vol 849 ◽  
pp. 40-44 ◽  
Author(s):  
Yong Dong ◽  
Dong Xu Qiao ◽  
Huan Zhi Zhang ◽  
Yi Ping Lu ◽  
Tong Min Wang ◽  
...  
Keyword(s):  
Solid Solution ◽  
Phase Composition ◽  
Intermetallic Compound ◽  
Microstructure Evolution ◽  
Molar Ratio ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Influence Mechanism ◽  
Ni Content ◽  
Compound Matrix

The microstructures, phase composition and hardness of the AlCrFeNixMo0.2 high entropy alloy (x=0.5, 0.8, 1.2 and 1.5, the x values refer to molar ratio) were reported. When the value of x was smaller than 1.2, the alloys consisted of BCC and B2 structures. The BCC and B2 phases were identified to be (Cr, αFe) solid solution and NiAl intermetallic compound, respectively. With the increase of x from 0.5 to 1.2, the microstructure transformed from dendrite/inter-dendrite to eutectic microstructures. When the x was equal to 1.5, besides BCC and B2 phases, another CrFe2.32MoNi phases formed and Net-like (Cr, αFe) phases distributed in the NiAl intermetallic compound matrix. The hardness first decreased then increased with the increase of Ni content. Generally, Ni element is a FCC stabilizer. However, in AlCrFeNixMo0.2 alloys, Ni element promoted the formation of B2 and CrFe2.32MoNi phases. The influence mechanism of Ni element was discussed systematically.

Bulk Mechanical Alloying of Al/Fe Multilayer by Accumulative Roll-Bonding Process

2007 ◽  
Vol 26-28 ◽  
pp. 695-698 ◽  
Author(s):  
Takuro Nakamura ◽  
Hiromoto Kitahara ◽  
Jung Goo Lee ◽  
Nobuhiro Tsuji
Keyword(s):  
Solid Solution ◽  
Intermetallic Compound ◽  
Mechanical Alloying ◽  
Accumulative Roll Bonding ◽  
Supersaturated Solid Solution ◽  
Shear Bands ◽  
Equivalent Strain ◽  
Bonding Process ◽  
Accumulative Roll Bonding Process ◽  
Roll Bonding

Pure Al (99%) and pure Fe (99.5%) sheets were mutually stacked and severely deformed up to equivalent strain of 16 by the accumulative roll bonding (ARB) process in an attempt to achieve bulk mechanical alloying. The deformation was carried out at RT. The Al/Fe sheets ARB processed by 1 cycle showed a number of shear bands penetrating the stacked layers. The Fe layers, which were harder than the Al layers, were subdivided by the shear bands into diamond-shaped regions. Dissolution of Fe into Al was observed and a supersaturated solid solution was formed in the specimen ARB processed by 10 cycles. It was also found that local amorphization occurred at interface regions via formation of Al5Fe2 intermetallic compound.

The synthesis of NbSi2 by mechanical alloying

1997 ◽  
Vol 12 (5) ◽  
pp. 1172-1175 ◽  
Author(s):  
Taiping Lou ◽  
Guojiang Fan ◽  
Bingzhe Ding ◽  
Zhuangqi Hu
Keyword(s):  
Solid Solution ◽  
Differential Scanning Calorimetry ◽  
Intermetallic Compound ◽  
Mechanical Alloying ◽  
Ball Milling ◽  
Temperature Rise ◽  
Milling Time ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray

The stoichiometric intermetallic compound NbSi2 has been synthesized by mechanical alloying (MA) elemental Nb and Si powders. The alloying process has been investigated by means of x-ray diffraction (XRD) and differential scanning calorimetry (DSC). It was found that the formation of the Nb2Si intermetallic compound occurs abruptly after 65 min of milling without any interruptions during the alloying process. However, short interruptions at a 5 min interval during ball milling result in a gradual reaction for the formation of the NbSi2 compound as well as a new metastable bcc structured solid solution. We conclude that the temperature rise during mechanical alloying plays an important role in initiating the abrupt reaction after an incubation milling time.

Analysis of Organizations of Brazed Seam 5052 Al Alloy Contact Reactive Brazing

2013 ◽  
Vol 690-693 ◽  
pp. 2598-2600 ◽  
Author(s):  
Fen Fang Tan ◽  
Kang Du
Keyword(s):  
Solid Solution ◽  
Intermetallic Compound ◽  
Reaction Layer ◽  
Al Alloy ◽  
Layer Material ◽  
Cu Foil ◽  
Ternary Intermetallic Compound ◽  
Binary Intermetallic Compound

Test of 5052 Al alloy contact reactive brazing has been conducted in the case of special brazing parameters, using Cu foil-Mg power-Cu foil as reaction layer material, the microstructure were analyzed and discussed primarily. The results show that the brazing seam structure consisted of α-Al solid solution and CuAl2 intermetallic compound; the organizations of brazed seam include Al (Mg, Cu) solid solution CuAl2 binary intermetallic compound, complicated ternary intermetallic compound and Al2MgO4.

The Microstructure of Ni-Based Surface Infiltrated Layer on Cast Steel Substrate

2011 ◽  
Vol 117-119 ◽  
pp. 1133-1136
Author(s):  
Gui Rong Yang ◽  
Wen Ming Song ◽  
Ying Ma ◽  
Yuan Hao
Keyword(s):  
Solid Solution ◽  
Intermetallic Compound ◽  
Raw Materials ◽  
Steel Substrate ◽  
Cast Steel ◽  
Hardness Distribution ◽  
Micro Hardness ◽  
Casting Technique ◽  
Gradient Change ◽  
And Diffusion

The Ni-based alloying powder was successfully used as the raw materials for fabricating surface infiltrated layers on cast steel ZG45 substrate through a vacuum infiltration casting technique (VICT). The microstructures of surface Ni-based infiltrated layer, the micro-hardness distribution are investigated. The infiltrated layer includes three areas that are surface part-melting area, melting completely fusion area and diffusion solid solution area. The main composition of surface infiltrated layer was intermetallic compound Cr2B，NiB and solid solution. The main phase of transition layer was solid solution. The micro-hardness of Ni-based infiltrated layer presented gradient change from surface infiltrated layer to substrate. The average micro-hardness was about 550HV.

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