Effects of cooling rate on the microstructure control and liquid–liquid phase separation behavior of Cu–Fe–P immiscible alloys

Li, Yongli; Xia, Wenli; Wang, Xinglong; Ju, Yan; Liu, Tongtong; Zhao, Degang; Zuo, Min

doi:10.1016/j.mtcomm.2022.104300

Cited by 5 publications

(4 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can also be seen from Table 3 that the Co element mainly appears in the α-Fe phase. Element P is not found in either phases of Figure 6 a, because the solid solubility of element P in α-Fe and Cu-rich phases is very limited, so they tend to be enriched at defects, such as grain boundaries and sintering pores [ 45 ].…”

Section: Results and Analysismentioning

confidence: 99%

Effect of Cu-Sn Addition on Corrosion Property of Pressureless Sintered Fe-Cu-Co Substrate Alloys

Tao

Chen

et al. 2023

Materials

View full text Add to dashboard Cite

Fe-Cu-Co prealloyed powder is used for bonding metal of diamond tools. In order to obtain diamond tools with good mechanical properties by pressureless sintering, it is necessary to add Cu-Sn sintering aids. The substrate also has high corrosion resistance requirements, which is conducive to the chemical erosion of diamond tools. This paper mainly studies the effects of Cu-Sn on the corrosion behavior of pressureless sintered Fe-Cu-Co substrate. The results show that the linear contraction rate and relative density of pressureless sintered Fe-Cu-Co alloy at 875 °C reach their peak when the Cu-Sn content is 8 wt.%, 15.13% and 97.5%, respectively. The substrate is mainly composed of α-Fe and Cu-rich phases, and selective corrosion occurs during electrochemical corrosion; namely, α-Fe grains are more prone to corrosion than Cu-rich grains to form porous corrosion surfaces. With the increase in Cu-Sn addition, the volume fraction of the Cu-rich phase increases, the corrosion current density and the passive current density gradually decrease, and the corrosion resistance of the alloy is improved. The amount and integrity of anodic passive film on the Fe-Cu-Co surface increases with the increase in Cu-Sn addition. The oxygen content of the anodic passivation film is lower than that of the active corrosion products of the α-Fe phase, thus reducing the oxygen concentration gradient and slowing down the corrosion. The addition of Cu-Sn is conducive to improving the corrosion resistance of Fe-Cu-Co alloy as the substrate of diamond tools.

show abstract

Section: Results and Analysismentioning

confidence: 99%

Effect of Cu-Sn Addition on Corrosion Property of Pressureless Sintered Fe-Cu-Co Substrate Alloys

Tao

Chen

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…Furthermore, it was observed that the particle sizes of second precipitations in these immiscible alloys were obviously decreased, which might be due to the weakening effect of Co addition on the Marangoni convection during the solidification process, However, the decrease of Marangoni convection in immiscible alloys was reported to be attributed to the changes of interfacial energy between L 1 and L 2 before and after the addition of Co. Cho et al reported that as for Cu–Fe alloy the addition of Zr was highly effective to activate γ-Fe nucleation by decreasing the mixing enthalpy and also accelerating heterogeneous nucleation, resulting in the significant microstructure evolution of immiscible alloys . Furthermore, the density difference between the two liquid phases could also be reduced to a certain extent, resulting in the weakening of liquid phase separation caused by stokes motion . Besides these, the catalytic properties of Fe–P@Cu alloy before and after the addition of Co were also evaluated.…”

Section: Resultsmentioning

confidence: 99%

“…18 Furthermore, the density difference between the two liquid phases could also be reduced to a certain extent, resulting in the weakening of liquid phase separation caused by stokes motion. 36 Besides these, the catalytic properties of Fe−P@Cu alloy before and after the addition of Co were also evaluated. Due to the obvious refinement of the second phase with Co addition, more active sites of (Fe x Co 1−x ) 2 P would be exposed, resulting in the improvement of catalytic performance.…”

Section: Methodsmentioning

confidence: 99%

Effects of Co Addition on Microstructure Evolution and Efficient Hydrogen Evolution of Self-Supported Fe–P@Cu Immiscible Alloy

Zuo

Xia

et al. 2023

ACS Appl. Eng. Mater.

Self Cite

View full text Add to dashboard Cite

In this article, the effects of Co addition on microstructure evolution and catalytic efficiency variation of an Fe−P@Cu immiscible alloy were systematically studied. According to the first-principles molecular dynamics simulations, it was found that P in the Fe−P@Cu alloy with Co addition would be preferentially bonded with Fe and/or Co in the first coordination shell, and Cu and (Fe+Co) atoms tended to appear on the opposite side of P atom in the three-dimensional cluster configuration, which would have a significant guiding effect on the subsequent solidification process. Through the microstructure analysis, it was observed that the addition of Co element had an inhibitory action on the liquid phase separation behavior due to the changes of interfacial tension, resulting in the formation of a fine second phase structure. Through the electrochemistry characteristics, it was found that the overpotentials of Fe−P@Cu metallic catalysts containing 8% Co and 16% Co with a current density of 10 mA/cm 2 have been improved to be 160 and 155 mV in 0.5 M H 2 SO 4 respectively. This excellent catalytic performance might be mainly attributed to the rapid transport of ions and the remarkable amount increase of electron transfer, resulting in the obvious promotion of the hydrogen evolution reaction of (Fe x Co 1−x ) n P@Cu alloys.

show abstract

“…The self-lubricating wear resistance of Al-Bi immiscible alloys arises from the strength of the Al matrix with a well-dispersed soft Bi phase. Therefore, control of the dispersion of Bi-rich droplets can potentially improve the performance of Al-Bi immiscible alloys [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Achieving High Self-Lubricating Performance of Al-Bi-Sm-Ti Alloys Based on the Intermetallic Compounds

Man,

Zhang,

Nong

et al. 2023

Metals

View full text Add to dashboard Cite

Al-Bi immiscible alloys, as wear resistance material, have attracted increasing attention in the past. The solidification processing of alloys plays a significant role in the final solidification microstructure and properties of immiscible alloys. Here, we present a strategy to produce a homogeneous microstructure in Al-Bi alloys based on intermetallic compounds. With the addition of Sm and Ti, the effect on the microstructure and properties was discussed in detail. The Al-Bi-Sm-Ti alloys achieve high self-lubricating performance, referring to the values of the coefficient of friction and wear rate. The intermetallic compounds formed were regarded as the main anti-friction and anti-wear factors. The results of numerical simulation indicate that microsegregation in Al-Bi alloys was retarded based on the intermetallic compounds. The coefficient of friction of the Al-Bi-1Sm-2Ti alloy was 46.2% lower than that of the Al-Bi alloys at 300 m. This research provides a new perspective and guidance for designing and fabricating composites with superior self-lubricating properties.

show abstract

Effects of cooling rate on the microstructure control and liquid–liquid phase separation behavior of Cu–Fe–P immiscible alloys

Cited by 5 publications

References 32 publications

Effect of Cu-Sn Addition on Corrosion Property of Pressureless Sintered Fe-Cu-Co Substrate Alloys

Effect of Cu-Sn Addition on Corrosion Property of Pressureless Sintered Fe-Cu-Co Substrate Alloys

Effects of Co Addition on Microstructure Evolution and Efficient Hydrogen Evolution of Self-Supported Fe–P@Cu Immiscible Alloy

Achieving High Self-Lubricating Performance of Al-Bi-Sm-Ti Alloys Based on the Intermetallic Compounds

Contact Info

Product

Resources

About