Homogeneous granular microstructures developed by phase separation and rapid solidification of liquid Fe-Sn immiscible alloy

Wang, W.L.; Wu, Yulun; Li, L.H.; Niu, Y.; Wei, Baogang

doi:10.1016/j.jallcom.2016.09.140

Cited by 19 publications

(5 citation statements)

References 27 publications

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“…然而, 在偏晶合金相图中存在一个液态组元不混溶区间, 当温度高于组元互溶温度的单相偏晶合金熔体冷却进入液态组元不混溶温度区间时会生成一个与基体熔体不混溶的液相 [11][12][13] , 在地面重力条件下凝固时非常容易形成图2所示的两相分层的凝固组织 [14] , Ahlborn等人 [15] 和Potard [ , Carlberg等人 [17][18][19][20][21] 在Texus 探空火箭和"空间实验室"等微重力条件下开展了实验研究; 姜万顺等人 [22][23][24][25][26] 利用返回式卫星、神舟飞船以及天宫二号空间实验室研究了Al-Pb, Zn-Pb, Al-Bi及 Al-Bi-Sn等偏晶合金的凝固组织形成过程. 此外, 人们也在地面模拟微重力条件对偏晶合金的凝固过程开展了大量研究 [27][28][29][30][31][32][33][34][35][36][37][38][39] , 本文将综述相关研究工作的进展情况.…”

Section: 前言unclassified

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Progress in the solidification of monotectic alloys under the microgravity condition of space

Jiang¹,

Li²,

Zhang³

et al. 2020

Sci. Sin.-Phys. Mech. Astron.

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Monotectic alloys or alloys with a miscibility gap in the liquid state are a broad kind of materials. They are especially suitable for the manufacturing of either the in-situ particle composite materials or the composite materials with a core/ shell structure and, thus, have a strong industry application background. These alloys, however, have an essential drawback that just the miscibility gap poses problems during solidification. When a single-phase melt of these alloys is cooled into the miscibility gap, it decomposes into two liquids enriched with different components. Generally, the convection flow caused by the gravity and the liquid-liquid phase transformation cause the formation of a phase segregated microstructure when these alloys are solidified under the normal gravitational conditions. Under microgravity condition, the convection flow caused by the gravity and the sediment or floating of the second phase due to the density difference between the components are obviously weakened, it is beneficial for the study of solidification theory of monotectic alloy and the preparation of monotectic alloys composited with a well dispersed microstructure. In recent decades, plenty of efforts have been made to investigate the solidification of monotectic alloys under microgravity conditions, this article will review the research work in this field during the last few decades.

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Section: 前言unclassified

“…及落管 [35][36][37][38][39] 等来模拟微重力环境, 研究偏晶合金凝固过程. 20世纪80年代初, Abramov等人 [27] 利用正交电磁场模拟微重力环境研究了偏晶合金的凝固行为.…”

Section: 地面模拟微重力条件下偏晶凝固过程研究unclassified

Progress in the solidification of monotectic alloys under the microgravity condition of space

Jiang¹,

Li²,

Zhang³

et al. 2020

Sci. Sin.-Phys. Mech. Astron.

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“…He noted that the two layers of nucleoshells represent the ultimate configuration for the liquid phase separation [2]. Numerous researchers have employed the microgravity approach to create liquid-phase immiscible alloys, including Wang [3,4], Xia [5], and Zhao [6]. Electromagnetic levitation, in addition to the microgravity method, is also utilized to prepare immiscible alloys with a homogeneous structure, like Kobayashi [7], Watanabe [8], Cao [9], and Lin [10].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Surface Properties of Cu-Fe-Cr Alloys through Laser Cladding: The Role of Mo and B4C Additives

Song,

Jiang,

Wang

2023

Coatings

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Laser cladding is a powerful surface treatment technique that can significantly enhance the properties of metal alloys. This study delves into the liquid phase separation behavior of Cu-Fe-Cr alloys under the rapid solidification conditions inherent in laser cladding and evaluates the influence of 4% Mo and 2% B4C additions on the resulting alloy characteristics. The intensive undercooling characteristic of the laser cladding process facilitates the alloy’s entry into the liquid-phase immiscibility gap, prompting pronounced phase separation. Our investigation reveals the emergence of Fe-rich regions, exhibiting a variety of shapes, set against a continuous Cu-rich matrix. The incorporation of Mo and B4C was found to modulate the mixing enthalpy and entropy, thereby refining the phase distribution: Mo was observed to prevent the agglomeration of Fe cores, resulting in a dispersion of isolated Fe cores throughout the Cu-rich matrix, while B4C promoted a more uniform compositional distribution. This study further enumerates the enhancements in microhardness, wear resistance, and magnetic properties of the alloys. Notably, the Cu-Fe-Cr-Mo-B4C alloy demonstrated a microhardness exceeding 600 HV, a low coefficient of friction around 0.15, high saturation magnetization, and reduced coercivity. These results underscore the efficacy of laser cladding in tailoring the microstructure and properties of Cu-Fe alloys, providing insights for the controlled manipulation of phase separation to optimize surface characteristics for engineering applications.

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“…Immiscible alloys exhibit a specific type of phase diagram characterized by a miscibility gap in the liquid state [1][2][3][4]. When cooling into the miscible gap, decomposition will happen, a homogeneous single-phase liquid separates into two liquids that are immiscible with each other and will form distinct phases [5][6][7][8][9]. Immiscible alloys are of particular interest because they can exhibit unique properties that are not found in their individual component metals.…”

Section: Introductionmentioning

confidence: 99%

The Influences of Micro-Alloying Element Sn and Magnetic Field on the Microstructure Evolution of Al–Bi Immiscible Alloys

Chen,

Jiang,

Zhao

2023

Metals

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An investigation was conducted through directional solidification experiments to explore the impact of micro-alloying element Sn and a magnetic field on the solidification behavior of immiscible Al–Bi alloys, as well as the combined effect of Sn and the magnetic field. Experimental results show that the size distribution of the dispersed particles in the low-speed solidified Al–3.4 wt.%Bi alloy presents two peaks, while it only shows one peak when solidified at a relatively high speed. The addition of Sn not only can enhance the nucleation rate and the number density of the Bi-rich droplets in the sample, but also decrease the Marangoni migration velocity and the axial resultant velocity of minority phase droplets in front of the solidification interface. Thereby it promotes the formation of Al–Bi alloys with a well-dispersed microstructure. A static magnetic field with the strength of 0.2 T increases the number density of the dispersed particles and decreases the average size and the size distribution width of the dispersed particles. Under the effect of Sn addition and static magnetic field, the average radius of the dispersed particles R and the solidification velocity V0 satisfy R∝V0−1/3 when the alloy was solidified at a relatively low velocity, R and V0 satisfy R∝V0−1/2 when the alloy is solidified at a high velocity.

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Homogeneous granular microstructures developed by phase separation and rapid solidification of liquid Fe-Sn immiscible alloy

Cited by 19 publications

References 27 publications

Progress in the solidification of monotectic alloys under the microgravity condition of space

Progress in the solidification of monotectic alloys under the microgravity condition of space

Enhancing Surface Properties of Cu-Fe-Cr Alloys through Laser Cladding: The Role of Mo and B4C Additives

The Influences of Micro-Alloying Element Sn and Magnetic Field on the Microstructure Evolution of Al–Bi Immiscible Alloys

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