scholarly journals Retracted: Influence of Al Content on Degradation Behavior of Cu-Doped Mg-Al Alloys for Drill-Free Plugging Applications

2021 ◽  
Vol 2021 ◽  
pp. 1-1
Author(s):  
Advances in Materials Science and Engineering
Keyword(s):  
Al Alloys ◽  
Degradation Behavior ◽  
Al Content

scholarly journals Influence of Al Content on Degradation Behavior of Cu-Doped Mg-Al Alloys for Drill-Free Plugging Applications

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Li Kang ◽  
Yixuan Shi ◽  
Xiaoping Luo ◽  
Baosheng Liu
Keyword(s):  
Degradation Rate ◽  
Low Cost ◽  
Al Alloys ◽  
Degradation Behavior ◽  
Secondary Phases ◽  
Nacl Solution ◽  
Practical Solution ◽  
X Ray ◽  
Al Content ◽  
Degradation Properties

Herein, we report low-cost and rare-earth-free Cu-doped Mg-Al alloys for drill-free plugging applications and present the influence of Al content on degradation behavior. The phase composition and microstructure of fabricated alloys were characterized by using a scanning electron microscope (SEM) and X-ray diffractometer (XRD). Also, degradation properties were investigated using hydrogen evolution tests and the electrochemical measurements. The results reveal that the Al content is directly related to the proportion of secondary phases, such as Mg2Cu, Mg17Al12, and MgAlCu. Moreover, the Mg17Al12 and MgAlCu phases are distributed at α-Mg grain boundaries, whereas the MgAlCu phase is distributed within the Mg matrix. Acceleration of degradation rate is found due to microgalvanic corrosion in Mg-xAl-2Cu (in wt.%, named as ACx2, x = 0, 3, 5, and 9) alloys. In this regard, Mg2Cu, Mg17Al12, and MgAlCu phases act as a microgalvanic cathode against anodic magnesium matrixes. As such, the degradation rate of ACx2 alloys in 3.5% NaCl solution is ranked from AC02, AC32, AC52, to AC92. In this context, the AC02 alloy shows the fastest degradation rate, 46 times higher than the AC92 alloy. This may provide a practical solution to develop good alternatives for drill-free plugging materials.

Room Temperature Superplasticity in Fine/Ultrafine-Grained Zn-Al Alloys with Different Phase Compositions

2018 ◽  
Vol 385 ◽  
pp. 72-77
Author(s):  
Muhammet Demirtas ◽  
Harun Yanar ◽  
Onur Saray ◽  
Gençağa Pürçek
Keyword(s):  
Grain Size ◽  
Room Temperature ◽  
Grain Boundary Sliding ◽  
Al Alloys ◽  
Phase Boundaries ◽  
Superplastic Behavior ◽  
Al Content ◽  
Α Phase ◽  
Ultrafine Grained ◽  
Superplastic Elongation

Three Zn-Al alloys, namely Zn-22Al, Zn-5Al and Zn-0.3Al, were subjected to equal-channel angular pressing (ECAP), and the effect of ECAP on their microstructure and room temperature (RT) superplastic behavior were investigated in detail referring to previous studies reported by the authors of the current study. ECAP remarkably refined the microstructures of three alloys as compared to their pre-processed conditions. While the lowest grain size was achieved in Zn-22Al alloy as 200 nm, the grain sizes of Zn-5Al and Zn-0.3Al alloys were ~540 nm and 2 µm, respectively, after ECAP. After the formation of fine/ultrafine-grained (F/UFG) microstructures, all Zn-Al alloys exhibited superplastic behavior at RT and high strain rates. The maximum superplastic elongations were 400%, 520% and 1000% for Zn-22Al, Zn-5Al and Zn-0.3Al alloys, respectively. It is interesting to point out that the highest RT superplastic elongation was obtained in Zn-0.3Al alloy with the largest grain size, while Zn-22Al alloy having the lowest grain size showed the minimum superplastic elongation. This paradox was attributed to the different phase compositions of these alloys. The formation of Al-rich α/α phase boundaries, where grain boundary sliding is minimum comparing to Zn-rich η/η and η/α phase boundaries of Zn-Al alloys, is the lowest level in Zn-0.3Al alloy among all the alloys. Therefore, it can be concluded that if it is desired to achieve high superplastic elongation in Zn-Al alloys at RT, keeping Al content at a possibly minimum level seems to be the most suitable way.

Effect of Casting Method and Al Contents on Microstructure in AM-Type Magnesium Alloys

2010 ◽  
Vol 654-656 ◽  
pp. 663-666 ◽  
Author(s):  
Katsumi Watanabe ◽  
Kenji Matsuda ◽  
Takumi Gonoji ◽  
Tokimasa Kawabata ◽  
Katsuya Sakakibara ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Hardness Test ◽  
Al Alloys ◽  
Age Hardening ◽  
Casting Method ◽  
Absorption Properties ◽  
Al Content ◽  
Hardening Behavior ◽  
The Difference ◽  
Impact Absorption

Magnesium alloys have received considerable attention because of their lightweight and recyclability. AM-type and AZ-type Mg-Al alloys have been used for industrial products widely, particularly for AM-type alloys because of the better toughness and impact absorption properties than AZ-type alloys. However, there is little report about the effect of casting method on age-hardening behavior and microstructure of AM-type alloys. The purpose of this study is to investigate the difference of the age-hardening behavior and microstructures of three AM-type alloys cast with steel, copper and sand molds using hardness test and scanning electron microscopy (SEM) observation. Furthermore, the effect of Al content is also investigated in this study using three alloys of AM30 (3%Al), AM60 (6%Al) and AM90 (9%Al).

Isothermal Aging Behavior in Ti-10 Cr-Al Alloys for Medical Applications

2010 ◽  
Vol 89-91 ◽  
pp. 232-237 ◽  
Author(s):  
Shota Hatanaka ◽  
Masato Ueda ◽  
Masahiko Ikeda ◽  
Michiharu Ogawa
Keyword(s):  
Surface Modification ◽  
Elastic Modulus ◽  
Single Phase ◽  
Al Alloys ◽  
Aging Behavior ◽  
X Ray ◽  
Al Content ◽  
Upper Limit ◽  
Al Addition ◽  
Ice Water

The effect of Al addition on the elastic modulus and aging behavior in Ti-10 Cr alloys was investigated by means of electrical resistivity, X-ray diffractometry and Vickers hardness measurements. All of the alloys used were formed from solutions treated at 1173 K for 3.6 ks and then quenched into ice water (STQ). Following STQ, all Al-containing specimens exhibited a  phase, with the athermal  appearing only for alloys with zero Al addition. The elastic modulus was found to decrease with addition of Al from approximately 80 to 70 GPa, due to the suppression of the athermal . The specimens following STQ were isothermally aged at 573 K, 673 K and 773 K. The addition of Al was found to retard the onset of precipitation of the isothermal  phase and decrease the upper limit temperature for precipitation of this phase. On the other hand, as the Al content was increased, precipitation of the  phase was accelerated in the presence of an existing isothermal  phase. By contrast, this precipitation was suppressed under single  phase conditions. Surface modification for osteointegration was also performed. When the modified specimens were immersed in simulated body fluid, the surface modification was found to promote the deposition of HAp.

Influence of Al content on diamond nucleation and growth on Fe-Al alloys in CH4-H2 plasma atmosphere

2016 ◽  
Vol 688 ◽  
pp. 460-467 ◽  
Author(s):  
T.J. Pan ◽  
F. Ye ◽  
X.J. Li ◽  
L.L. He ◽  
M. Sanchez-Pasten ◽  
...  
Keyword(s):  
Nucleation And Growth ◽  
Al Alloys ◽  
Diamond Nucleation ◽  
Al Content

Effect of Al content on the microstructures and mechanical properties of Mg–Al alloys

2009 ◽  
Vol 508 (1-2) ◽  
pp. 129-133 ◽  
Author(s):  
L. Zhang ◽  
Z.Y. Cao ◽  
Y.B. Liu ◽  
G.H. Su ◽  
L.R. Cheng
Keyword(s):  
Mechanical Properties ◽  
Al Alloys ◽  
Al Content ◽  
Microstructures And Mechanical Properties

The Oxidation of Nickel-Aluminum and Iron-Aluminum Alloys

1984 ◽  
Vol 39 ◽  
Author(s):  
John V. Cathcart
Keyword(s):  
Oxidation Behavior ◽  
Void Formation ◽  
Al Alloys ◽  
Nickel Aluminum ◽  
Temperature Oxidation ◽  
Al Content ◽  
Iron Aluminum ◽  
Ordered Alloys ◽  
High Temperature Oxidation Behavior ◽  
Iron Aluminum Alloys

ABSTRACTThe high-temperature oxidation behavior of several ordered alloys in the Ni-Al and Fe-Al systems is reviewed with special emphasis on Ni3Al and NiAl. Ordering influences oxidation through its effect on the activities of the alloy components and by changing the point defect concentration in an alloy. Three categories of Ni-Al alloys are distinguished based on Al content and oxidation behavior. A characteristic feature of the oxidation of high-aluminum Ni-Al and Fe-Al alloys is the formation of voids in the substrate at the oxide-metal interface. The mechanism of void formation and its suppression by minor additions of oxygen-active elements is discussed. A brief description of the effect of preoxidation on the reactions of Ni3Al-base alloys in SO2/O2 environments is also included.

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