Effect of Microstructure and Performance of Nb–Cr–Fe–Ni Quaternary Alloys with the Variation of Niobium Element Content
Honglian DengLinsen LiJunjie FengJiqiu QiFuxiang WeiQingkun MengYaojian RenBin XiaoXiaolan XueQing YinYong‐Zhi LiYanwei SuiXiujuan FengWen ZhangPeng CaoЕ. Б. ЧубенкоVitaly Bondarenko
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Laves phase
Passivation
The effects of Co on the microstructure of Cu-Zn-Al alloy and on the dezincification corrosion resistance of alloys by corrosion test were studied.The results confirmed that Co could refine microstructure of alloys and change α and β phases from coarse plate-like to fine short plate-like.The dezincification corrosion resistance was obviously improved with addition of Co.Furthermore,the optimum amount of Co in Cu-Zn-Al alloy was also found.
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Elongation
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The effects of Cd addition on microstructure and corrosion behavior of as-cast AM50-Y-0.6Sb alloy were studied.The results show that the as-cast microstructure of AM50-Y-0.6Sb alloy consists of α-Mg matrix,β-Mg17Al12,Al2Y and YSb.With the increasing of Cd addition,the microstructure is refined gradually and Cd dissolves into the matrix with no new phase formation.The alloy with 1% Cd has the most fine and uniform grains and precipitates.As the content of Cd increasing,the corrosion rate and corrosion current density of the alloys are decreased,and the corrosion potential shifts to the positive.The alloy with 1% Cd has the best corrosion resistance,and the corrosion rate is only 1.07 mg·cm-2·d-1,which is decreased by 42.5% compared with the alloy without Cd addition.
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The mechanical alloying(MA) was used to prepare Al-12%Sn-x%Si alloy powders, and then, the bulk alloy was obtained by a combination of cold pressing and conventional powder sintering. The effects of Si addition on the microstructure and properties were investigated by XRD and SEM. The results show that appropriate Si addition can achieve the uniform Sn distribution in Al-12%Sn matrix. It can also effectively facilitate sintering due to the formation of Al-Si eutectic liquid phase, and significantly improve the densification of alloy. With the Si addition increasing, the hardness, strength and ductility enhance obviously. In addition, Si addition can also develop excellent wear properties in Al-12%Sn alloys, furthermore, when the Si addition is 2.5%, Al-12%Sn-2.5%Si has the best wear properties.
Ductility (Earth science)
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Selective Laser Melting
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In this paper,nickel-based alloy and nickel-based Cr2O3 as well as WC compound alloy coatings were remelted on the surface of 45 steel.The microstructure,corrosion resistance in acidmedia as well as corrosion-wear behaviors under different impact velocities or in acid media with various densities were investigated for the all laser remelted alloy coatings.The results have shown that the laser remelted alloy coatings present not only higher corrosion resistance but also much more improved corrosion-wear behaviors than stainless steels do.Based On microhardness test and microstructure and corrosion-wear surface morphology analyses,some preliminary attempts have been made to explain the corrosion-wear mechanism of those coatings
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The microstructure and tensile properties at room temperature of as-cast, solution-treated and aged samples of a Mg-5Sn-5Zn (wt%) alloy are investigated. The microstructure of the as-cast sample consists of -Mg primary, Mg-MgZn eutectic, divorced eutectic Mg2Sn and secondary precipitation Mg2Sn. After solution treatment, all the MgZn particles and the majority of Mg2Sn phases are dissolved into the matrix and the tensile strength and the elongation of the alloy increase obviously. During aging process many fine particles precipitate which result in the improvement of the yield strength.
Elongation
Precipitation hardening
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Forming Mechanism of α-Phase in Directionally Solidified Microstructure of Hypereutectic Cu-Cr Alloy
Microstructure of the hypereutectic Cu-1.7%Cr alloy during the directional solidification was observed,and the primary α-phase in the microstructure of the hypoeutectic Cu-Cr alloy that appeared in the microstructure of the hypereutectic Cu-Cr alloy was studied.The results show that the microstructures of the hypereutectic Cu-1.7%Cr alloy consist of primary β phase,α phase and eutectic(α+β).The components of α phase and eutectic(α+β) deviate from the equilibrium composition of each phase in the phase diagram.The primary β phase distributes in the α-phase matrix.The formation of α-phase in the hypereutectic Cu-1.7%Cr alloy is the outcome of the competition growth between α dendritic and eutectic(α+β) during the non-equilibrium solidification.The α-phase is the non-equilibrium microstructure and the eutectic(α+β) is the pseudo-eutectic.With the increase of cooling rate,the α-phase refines and its number increases.
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The effect of microstructure on corrosion morphology of ZL101 alloy,Electrolytic ZL101 alloy and A356 alloy in a simulated atmospheric environment with moisture is studied.The experimental results on microstructure and corrosion morphology by SEM and chemical composition analysis by WDS indicate that the excellent corrosion resistance of electrolytic Al-Si alloy is related to both the homogeneity of chemical composition and the fine microstructure of alloy.The results of XDA indicate that less amount of impurity phase in A356 is responsible for its better corrosion resistance.
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