Morphology evolution of abnormal tertiary dendrite by diffusion- controlled remelting/resolidification in directionally solidified Sn–Mn peritectic alloy

2021 ◽  
pp. 125637
Author(s):  
Peng Peng ◽  
Shengyuan Li ◽  
Wanchao Zheng ◽  
Li Lu ◽  
Shudong Zhou ◽  
...  
Keyword(s):  
Morphology Evolution ◽  
Directionally Solidified ◽  
Peritectic Alloy ◽  
Diffusion Controlled

A TEM investigation of a hyper-eutectic lead-tin alloy

1988 ◽  
Vol 46 ◽  
pp. 562-563
Author(s):  
John A. Sutliff
Keyword(s):  
Volume Diffusion ◽  
Eutectic Mixture ◽  
Precipitation Reaction ◽  
Directionally Solidified ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Diffusion Controlled ◽  
Discontinuous Precipitation Reaction ◽  
Controlled Precipitation

Near-eutectic Pb-Sn alloys are important solders used by the electronics industry. In these solders, the eutectic mixture, which solidifies last, is the important microstructural consituent. The orientation relation (OR) between the eutectic phases has previously been determined for directionally solidified (DS) eutectic alloys using x-ray diffraction or electron chanelling techniques. In the present investigation the microstructure of a conventionally cast, hyper-eutectic Pb-Sn alloy was examined by transmission electron microscopy (TEM) and the OR between the eutectic phases was determined by electron diffraction. Precipitates of Sn in Pb were also observed and the OR determined. The same OR was found in both the eutectic and precipitation reacted materials. While the precipitation of Sn in Pb was previously shown to occur by a discontinuous precipitation reaction,3 the present work confirms a recent finding that volume diffusion controlled precipitation can also occur.Samples that are representative of the solder's cast microstructure are difficult to prepare for TEM because the alloy is multiphase and the phases are soft.

Interfacial morphology evolution in directionally solidified FeCrAl alloys

2018 ◽  
Vol 139 ◽  
pp. 303-310 ◽  
Author(s):  
Yang He ◽  
Jianhua Liu ◽  
Shengtao Qiu ◽  
Zhenqiang Deng ◽  
Yindong Yang ◽  
...  
Keyword(s):  
Morphology Evolution ◽  
Directionally Solidified ◽  
Interfacial Morphology ◽  
Fecral Alloys

scholarly journals On oscillatory microstructure during cellular growth of directionally solidified Sn–36at.%Ni peritectic alloy

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Peng Peng ◽  
Xinzhong Li ◽  
Jiangong Li ◽  
Yanqing Su ◽  
Jingjie Guo
Keyword(s):  
Cellular Growth ◽  
Directionally Solidified ◽  
Peritectic Alloy

scholarly journals Detachment of secondary dendrite arm in a directionally solidified Sn-Ni peritectic alloy under deceleration growth condition

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Peng Peng ◽  
Xinzhong Li ◽  
Jiangong Li ◽  
Yanqing Su ◽  
Jingjie Guo ◽  
...  
Keyword(s):  
Growth Condition ◽  
Directionally Solidified ◽  
Peritectic Alloy

Microstructural length scales in directionally solidified Sn-40 at.%Mn peritectic alloy containing intermetallic compounds

2014 ◽  
Vol 55 ◽  
pp. 73-79 ◽  
Author(s):  
Peng Peng ◽  
Yanqing Su ◽  
Xinzhong Li ◽  
Jiangong Li ◽  
Jingjie Guo ◽  
...  
Keyword(s):  
Intermetallic Compounds ◽  
Directionally Solidified ◽  
Length Scales ◽  
Peritectic Alloy

Microstructure Formation during Unidirectionally Solidified Pb-Bi-Sn Tenary Quasi-Peritectic Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 3799-3803
Author(s):  
Xiao Wu Hu ◽  
Hong Yan
Keyword(s):  
Solid Solution ◽  
Temperature Gradient ◽  
Growth Velocity ◽  
Solution Phase ◽  
Solid Solution Phase ◽  
Directionally Solidified ◽  
Microstructure Formation ◽  
Peritectic Alloy ◽  
Constant Temperature Gradient ◽  
Α Phase

In order to investigate the microstructure formation resulted from quasi-peritectic reaction in Pb-Bi-Sn ternary alloy, specimens were directionally solidified with a constant temperature gradient (G=18 K/mm) and the growth velocities ranging from 0.5 μm/s to 10 μm/s. Experimental results indicated that a microstructure, which is composed of the residual primary α phase (Pb-rich solid solution), peritectic β-(Pb7Bi3) phase and Sn-rich solid solution phase was observed. Transition from primary α-cell to primary α-dendrite took place with the increasing growth velocity. The rod-like eutectic was observed in the inter-cellular region under low growth velocity. Detail analyses were adopted to identify the phases and determine the phase compositions, respectively.

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