On the electrochemical behavior of Cu–16%Zn–6.5%Al alloy containing the β′-phase (martensite) in borate buffer

2013 ◽  
Vol 107 ◽  
pp. 238-247 ◽  
Author(s):  
M. Blanco ◽  
J.T.C. Barragan ◽  
N. Barelli ◽  
R.D. Noce ◽  
C.S. Fugivara ◽  
...  
Keyword(s):  
Electrochemical Behavior ◽  
Borate Buffer ◽  
Al Alloy ◽  
Β Phase

scholarly journals The electrochemical behavior of an aluminum alloy anode for rechargeable Al-ion batteries using an AlCl3–urea liquid electrolyte

RSC Advances ◽  
2017 ◽  
Vol 7 (51) ◽  
pp. 32288-32293 ◽  
Author(s):  
Chen Wang ◽  
Junfeng Li ◽  
Handong Jiao ◽  
Jiguo Tu ◽  
Shuqiang Jiao
Keyword(s):  
Aluminum Alloy ◽  
Electrochemical Behavior ◽  
Low Cost ◽  
Pyrolytic Graphite ◽  
Liquid Electrolyte ◽  
Al Alloy ◽  
Alloy Anode ◽  
Aluminum Alloy Anode

A novel Al-ion battery based on an Al alloy anode, pyrolytic graphite paper cathode, and low-cost AlCl3–urea liquid analogue electrolyte was successfully established. The present Al alloy/PG battery can afford a capacity as high as 105 mA h g−1.

Microstructure, Texture and Mechanical Properties of Al Alloy A380 Prepared by Directional Solidification Method

2019 ◽  
Vol 287 ◽  
pp. 18-23
Author(s):  
Hemant Borkar ◽  
Salem Seifeddine ◽  
Anders E.W. Jarfors
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Directional Solidification ◽  
Solidification Rate ◽  
Al Alloy ◽  
Secondary Dendrite Arm Spacing ◽  
Β Phase ◽  
Cu Alloy ◽  
Eutectic Si ◽  
The One

The mechanical properties of Al-Si alloys are affected by several microstructural features such as secondary dendrite arm spacing (SDAS), size and shape of eutectic Si-particles, presence of intermetallics as well as by porosity. In the current study, Al-Si-Cu alloy A380 was prepared by a unique directional solidification method to produce samples with two different SDAS of 9 μm and 27 μm. The lower solidification rate resulted in larger SDAS, larger grain size, larger eutectic Si and larger intermetallics including Fe-rich β phase. The microstructure with higher solidification rate was found to be finer and more homogeneous with smaller eutectic Si and intermetallics. The specimen with larger SDAS exhibited stronger texture than the one with smaller SDAS. The specimen with smaller SDAS showed improved mechanical properties including YS, UTS and ductility.

Behavior of β(Mg17Al12) Phases in Mg-Al Alloy Subject to Cycling Cryogenic Treatment

2013 ◽  
Vol 575-576 ◽  
pp. 390-393 ◽  
Author(s):  
Guirong Li ◽  
Hong Ming Wang ◽  
Yun Cai ◽  
Xue Ting Yuan
Keyword(s):  
Cryogenic Treatment ◽  
Weight Percent ◽  
Al Alloy ◽  
Β Phase ◽  
The Matrix ◽  
Thermo Calc Software ◽  
And Performance ◽  
And Behavior ◽  
Microstructure And Performance ◽  
Electronic Microscope

In Mg-Al alloy β (Mg17Al12) phase is the main precipitate and reinforced phase. The microstructure and performance of alloy are strongly dependent on the morphology and behavior of β phases. In this paper, a kind of Mg-Al alloy is chosen as the research object with 8.92 weight percent aluminum element. The alloy is subjected to cycling cryogenic treatment. The microstructure evolution and thermodynamic balance are analyzed by scanning electronic microscope and Thermo-CALC software. The results show that after two cryogenic treatments the quantity of the precipitate hardening β phase increases and the sizes of the precipitates are refined from 8~10 μm to 2~4μm. This is expected to be due to the decreased solubility of aluminum in the matrix at low temperatures and the significant plastic deformation due to internal differences in thermal contraction between phases and grains.

Crystallographic effect of a high magnetic field on a solidified hypoeutectic Zn–Al alloy

2014 ◽  
Vol 47 (2) ◽  
pp. 606-612 ◽  
Author(s):  
Lei Li ◽  
Zongbin Li ◽  
Yudong Zhang ◽  
Claude Esling ◽  
Haitao Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Orientation Relationship ◽  
High Magnetic Field ◽  
Resistance Force ◽  
Al Alloy ◽  
Magnetic Field Direction ◽  
Continuous Growth ◽  
Β Phase ◽  
Crystallographic Orientation Relationship ◽  
Orientation Modification

Hypoeutectic Zn–4.45 wt% Al solidified under a high magnetic field was investigated crystallographically. With the field, the primary zinc-rich β phase is distributed homogeneously and orients with thecaxis perpendicular to the magnetic field direction. These results are attributed to the magnetic viscosity resistance force and the magnetocrystalline anisotropy of zinc, respectively. The orientation modification also leads to a preferential alignment of the flat-shaped primary β dendrites. Furthermore, with the field, the eutectic β phase shows an orientation character similar to that of the primary β phase. This arises from its continuous growth with the primary β phase. In addition, a specific crystallographic orientation relationship ({0001}β||{111}α, 〈1\overline 210〉β||〈110〉α) exists in some of the eutectics (between the eutectic zinc-rich β and aluminium-rich α phases). However, this orientation relationship is related to the distribution of primary β dendrites, which originates from the independent nucleation of the pseudo-primary α phase attached to the primary β dendrites.

β Phase transformations in the Cu–11mass%Al alloy with Ag additions

2011 ◽  
Vol 106 (2) ◽  
pp. 339-342 ◽  
Author(s):  
A. G. Magdalena ◽  
A. T. Adorno ◽  
T. M. Carvalho ◽  
R. A. G. Silva
Keyword(s):  
Phase Transformations ◽  
Al Alloy ◽  
Β Phase ◽  
Ag Additions

Microstructure of the ordered β phase in TiAl alloy with chromium and vanadium

1994 ◽  
Vol 31 (5) ◽  
pp. 571-575 ◽  
Author(s):  
Ying Gao ◽  
Jing Zhu ◽  
Q.G. Cai
Keyword(s):  
Al Alloy ◽  
Β Phase

TRANSFORMATION BEHAVIOR AND SHAPE MEMORY EFFECT OF A CoAl ALLOY

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1931-1936 ◽  
Author(s):  
FENG CHEN ◽  
BING TIAN ◽  
YUXIANG TONG ◽  
YUFENG ZHENG
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Strain Curve ◽  
Bending Test ◽  
Al Alloy ◽  
Sem Images ◽  
Β Phase ◽  
Fcc Phase

This paper investigates the microstructure, martensitic transformation and shape memory effect of Co -16 Al alloy. The optical micrographs of Co -16 at .% Al alloy quenched from 1200°C show that the ε martensite occurs at room temperature, while some remaining γ phase can also be observed. This microstructure analysis can be supported by XRD pattern. It is shown that the alloy undergoes a martensitic reverse transformation at about 220°C during heating. However, no transformation from the fcc phase to hcp phase is detected by DSC measurement upon cooling. It is thought that the precipitation of β phase by aging at high temperature may suppress the martensitic transformation. The tension strain is 12% and the fracture strength is above 800MPa. No obvious yield deformation is observed from the stress-strain curve. SEM images exhibits many dimples on the fracture surface, which means the fracture mechanism is ductile rupture. Bending test show that only 25% deformation can be recovered due to shape memory effect when the pre-strain is 5%.

Effects of Alloying Elements on the Oxygen Snoek-Type Relaxation in Ti-Nb Alloys

2012 ◽  
Vol 184 ◽  
pp. 75-80 ◽  
Author(s):  
H. Lu ◽  
Chun Xia Li ◽  
Fu Xing Yin ◽  
Qian Feng Fang ◽  
Osamu Umezawa
Keyword(s):  
Variable Temperature ◽  
Ternary Alloys ◽  
Alloying Elements ◽  
Al Alloy ◽  
Lattice Constants ◽  
Β Phase ◽  
A Value ◽  
Ti Alloys ◽  
Ternary Alloying ◽  
Damping Peak

The effect of ternary alloying elements on the oxygen Snoek-type relaxation in the Ti-24Nb-2X-1.7O alloys (X = Al, Sn, Cr, Mn, Fe) was investigated. The dipole shape factor (δλ) of the Snoek-type relaxation was figured out for each ternary alloy based on the measured damping peak with the variable temperature. The value ofδλin the Ti-Nb-Al alloy was the highest among the present ternary alloys. It was found thatδλincreased with the decreasing lattice constant as well as the decreasing valence electron number per atom (e/a) and came to a maximum value when the e/a value was around 4.24, which defined the β phase boundary. Therefore, decreasing the lattice constants and the e/a value as largely as possible with alloying elements in the β-Ti alloys is one of the feasible ways to increaseδλand to design the high damping Ti alloys.

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