Microstructure and enhanced strength of laser aided additive manufactured CoCrFeNiMn high entropy alloy
By Y. Chew, G. Bi, Z. G. Zhu, F. L. Ng, F. Weng, S. Liu, S. Nai, B. -. Lee. Materials Science & Engineering: A, 2019
215 citations recorded by the source corpus.
Abstract The CoCrFeNiMn high entropy alloy (HEA) bulk alloy was successfully manufactured using laser aided additive manufacturing (LAAM). The microstructure and mechanical behaviors of the as-fabricated HEAs were investigated. The as-built HEAs exhibit directional solidification at regions close to the melt-pool boundaries, forming dendritic columnar grains and transiting to equiaxed grains further away from the boundaries. Compared with the conventionally cast HEAs, the CoCrFeNiMn fabricated using LAAM possesses significantly higher yield strength (518 MPa) and ultimate tensile strength (660 MPa). The strengthening effect is attributed to finer grains and could be explained quantitatively through grain boundary strengthening. The as-built HEA shows a simultaneous enhancement in yield strength and ductility with decreasing testing temperature. The improved low temperature tensile properties could be ascribed to the formation of deformation twins at low temperature, which results in a steady strain hardening behavior. This work demonstrates the potential of using LAAM technology to extend the application of HEAs with fabrication of larger and more complex parts with good mechanical properties.
Subfields: Aerospace Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/24d54c7a341f25828c743739a071ba938d301563
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Citations in the corpus
- Advances in Metal Additive Manufacturing: A Review of Common Processes, Industrial Applications, and Current Challenges (2021, background): “For instance, advanced research is being undertaken to develop high-entropy alloys [160], magnetic alloys [161], bulk metallic glasses (BMG) [162], functionally graded materials (FGM) [163], novel metal composite structures [164,165], and nano-architected metals [162].”
- Review of Powder Bed Fusion Additive Manufacturing for Metals (2021, background): “The morphology of the sample after tensile test at 25 ◦C and −130 ◦C exhibited <100> and <111> as the main grain orientations along tensile axis [358].”