A mechanism for the microstructure formation in welds of laser welded aluminium-lithium alloy 2A97

2021 ◽  
Author(s):  
Yingkai Shao ◽  
Xiaoyang Li ◽  
Li Chen ◽  
Enguang He
Keyword(s):  
Microstructure Formation ◽  
Lithium Alloy

Effect of Bi and In on Microstructure Formation in Sn-3Ag-3Bi-3In/Cu and /Ni Solder Joints

2016 ◽  
Vol 700 ◽  
pp. 142-151 ◽  
Author(s):  
Sergey A. Belyakov ◽  
Christopher M. Gourlay
Keyword(s):  
Solid Solution ◽  
Phase Equilibria ◽  
Ternary Compound ◽  
Fine Particles ◽  
Solder Joints ◽  
Primary Phase ◽  
Significant Fraction ◽  
Microstructure Formation ◽  
Five Phases

Sn-3Ag-3Bi-3In solder has been investigated to improve the understanding of microstructure formation in this solder during solidification and soldering to Cu and Ni substrates. The as-solidified microstructures of Sn-3Ag-3Bi-3In samples were found to consist of a significant fraction of βSn dendrites with a complex eutectic between the dendrites. In total five phases were observed to form during solidification: βSn, Ag3Sn, Bi, ζAg and a “Sn-In-Bi” ternary compound. Soldering of Sn-3Ag-3Bi-3In to substrates changed the phase equilibria in the system and caused the formation of additional phases: Cu6Sn5 during soldering to Cu and Ni3Sn4 and metastable NiSn4 during soldering to Ni. It is shown that metastable NiSn4 forms as a primary phase in a complex 5-component Sn-3Ag-3Bi-3In-Ni system. In and Bi were detected in solid solution in the βSn matrix in amounts of ~1.5-2at% and ~1.2at% respectively. Bi also existed as fine particles of two distinct types. (i): sub-micron (<500nm) coral-like particles and (ii) facetted particles measuring up to 7-8 μm.

scholarly journals Influence of Hydrostatic Extrusion on the Mechanical Properties of the Model Al-Mg Alloys

2021 ◽  
Author(s):  
Aleksandra Towarek ◽  
Wojciech Jurczak ◽  
Joanna Zdunek ◽  
Mariusz Kulczyk ◽  
Jarosław Mizera
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Tensile Strength ◽  
Microstructural Analysis ◽  
Tensile Tests ◽  
Hydrostatic Extrusion ◽  
Microstructure Formation ◽  
Initial State ◽  
Degree Of Deformation ◽  
Al Mg Alloys

AbstractTwo model aluminium-magnesium alloys, containing 3 and 7.5 wt.% of Mg, were subjected to plastic deformation by means of hydrostatic extrusion (HE). Two degrees of deformation were imposed by two subsequent reductions of the diameter. Microstructural analysis and tensile tests of the materials in the initial state and after deformation were performed. For both materials, HE extrusion resulted in the deformation of the microstructure—formation of the un-equilibrium grain boundaries and partition of the grains. What is more, HE resulted in a significant increase of tensile strength and decrease of the elongation, mostly after the first degree of deformation.

Kinetics of the microstructure formation in a rapid solidified immiscible alloy

2008 ◽  
Vol 44 (2) ◽  
pp. 400-403 ◽  
Author(s):  
Jiuzhou Zhao ◽  
Haili Li ◽  
Qingliang Wang ◽  
Jie He
Keyword(s):  
Microstructure Formation ◽  
Immiscible Alloy ◽  
Kinetics Of
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