Solidification Kinetics of Zr50Cu35Ni15 Alloy: Experiments on the Ground and in Microgravity | Chapter 7 | Proceedings of the 8th International Conference on Solidification and Gravity

Experimental results on solidification kinetics of the glass forming Zr50Cu35Ni15 alloy are presented with measurements conducted under terrestrial and reduced gravity conditions. Alloy samples are processed in an Electromagnetic Levitation Facility (EML) installed on the ground (for measurements in the 1g-gravity) and in AIRBUS during parabolic flight campaigns (providing measurements under a reduced gravity field). The microstructure has been investigated by the Energy-dispersive X-ray (EDX) method with identification of the primary and secondary crystalline patterns. In the evolution analyses of the recalescence fronts, it is found that the square shape of the recalescence front changes from a square shape to a hexagonal shape as the undercooling increases from low to intermediate values. This change in the shape of the recalescence front might be attributed to the kinetic transition in the preferable crystal growth direction from the 〈100〉- to 〈111〉-direction in the growth of main stems of dendrites. The smooth rounded shape of the recalescence front is detected and attributed to globular transition in the dendrite morphology existing at the highest undercoolings. The microgravity environment enabled reduced convection, allowing clearer insights into solidification kinetics and dendritic behavior. These findings enhance the understanding of solidification processes and have implications for designing advanced glass-forming and intermetallic alloys for practical applications.

 

Author (s) Details

Chu Yu
Otto Schott Institute of Material Research, Friedrich Schiller University Jena, Löbdergraben 32, 07743, Jena, Germany and Institute of Applied Physics, Friedrich-Schiller-Universität Jena, Albert-Einstein-Str. 15, 07745, Jena, Germany.

 

Johannes Wilke
Otto Schott Institute of Material Research, Friedrich Schiller University Jena, Löbdergraben 32, 07743, Jena, Germany.

 

Hans-Jürgen Hempel
Otto Schott Institute of Material Research, Friedrich Schiller University Jena, Löbdergraben 32, 07743, Jena, Germany.

 

Yindong Fang
Otto Schott Institute of Material Research, Friedrich Schiller University Jena, Löbdergraben 32, 07743, Jena, Germany and Institute of Applied Physics, Friedrich-Schiller-Universität Jena, Albert-Einstein-Str. 15, 07745, Jena, Germany.

 

Stephanie Lippmann
Otto Schott Institute of Material Research, Friedrich Schiller University Jena, Löbdergraben 32, 07743, Jena, Germany and Institute of Applied Physics, Friedrich-Schiller-Universität Jena, Albert-Einstein-Str. 15, 07745, Jena, Germany.

 

Peter K. Galenko
Otto Schott Institute of Material Research, Friedrich Schiller University Jena, Löbdergraben 32, 07743, Jena, Germany.

 

Please see the book here:- https://doi.org/10.9734/bpi/mono/978-93-49473-95-9/CH7

Emphasizing on Production and Characterization of Zr Based Bulk Metallic Glass Matrix Composites (BMGMC) in the Form of Wedge Shape Ingots | Chapter 7 | Recent Developments in Engineering Research Vol.4

 

Bulk metallic glass matrix composites (BMGMC) are unique materials of future having excellent
mechanical properties (such as high hardness, strength and profound elastic strain limit). However,
they exhibit poor ductility and suffer from catastrophic failure on the application of force. The reasons
behind this are still not very well understood. In this study, an effort has been made to overcome this
pitfall by solidification processing. Zr based BMGMCs are produced in the form of “as cast” wedges
using vacuum arc melting and suction casting button furnace. The idea is to study the effect of cooling
rate and inoculation on formability during solidification. Adjustment, manipulation and proper control of
processing parameters are observed to reflect upon the quality of ingots such as improved castability,
proper mold filling and defect free casting as characterized by NDT. Bulk metallic glass matrix
composites (BMGMC) are very sluggish and difficult to cast alloys. Vacuum melting and suction
casting is effective way to fabricate these alloys. However, extremely careful control and monitoring of
process variables is needed to form these alloys in good shape. Further, thermal analysis, optical
microscopy and hardness measurement confirmed the formation and evolution of in-situ
composite structure. This is first footprint of pathway towards sustainable manufacturing of these
alloys in future.

Author (s) Details
Muhammad Musaddique Ali Rafique
Eastern Engineering Solutions LLC, Detroit, MI, USA.

View Book :- https://bp.bookpi.org/index.php/bpi/catalog/book/263

Emphasizing on Production and Characterization of Zr Based Bulk Metallic Glass Matrix Composites (BMGMC) in the Form of Wedge Shape Ingots | Chapter 7 | Recent Developments in Engineering Research Vol.4

 

Bulk metallic glass matrix composites (BMGMC) are unique materials of future having excellent
mechanical properties (such as high hardness, strength and profound elastic strain limit). However,
they exhibit poor ductility and suffer from catastrophic failure on the application of force. The reasons
behind this are still not very well understood. In this study, an effort has been made to overcome this
pitfall by solidification processing. Zr based BMGMCs are produced in the form of “as cast” wedges
using vacuum arc melting and suction casting button furnace. The idea is to study the effect of cooling
rate and inoculation on formability during solidification. Adjustment, manipulation and proper control of
processing parameters are observed to reflect upon the quality of ingots such as improved castability,
proper mold filling and defect free casting as characterized by NDT. Bulk metallic glass matrix
composites (BMGMC) are very sluggish and difficult to cast alloys. Vacuum melting and suction
casting is effective way to fabricate these alloys. However, extremely careful control and monitoring of
process variables is needed to form these alloys in good shape. Further, thermal analysis, optical
microscopy and hardness measurement confirmed the formation and evolution of in-situ
composite structure. This is first footprint of pathway towards sustainable manufacturing of these
alloys in future.

Author (s) Details
Muhammad Musaddique Ali Rafique
Eastern Engineering Solutions LLC, Detroit, MI, USA.

View Book :- https://bp.bookpi.org/index.php/bpi/catalog/book/263