Heterogeneous Lamella Design to Tune the Mechanical Behaviour of a New Cost-Effective Compositionally Complicated Alloy

Posted: 18 Dec 2020

See all articles by Yu Yin

Yu Yin

University of Queensland - School of Mechanical and Mining Engineering

Qiyang Tan

University of Queensland - School of Mechanical and Mining Engineering

Qiang Sun

University of Queensland - School of Mechanical and Mining Engineering

Wangrui Ren

Chongqing University - College of Material Science and Engineering

Jingqi Zhang

University of Queensland - School of Mechanical and Mining Engineering

Shiyang Liu

University of Queensland - School of Mechanical and Mining Engineering

Yingang Liu

University of Queensland - School of Mechanical and Mining Engineering

Michael Bermingham

University of Queensland - School of Mechanical and Mining Engineering

Houwen Chen

Chongqing University - College of Material Science and Engineering

Ming-Xing Zhang

University of Queensland - School of Mechanical and Mining Engineering

Date Written: December 2020

Abstract

A novel heterogeneous lamella (HL) design strategy was proposed to improve mechanical properties of a new cost-effective Fe 35 Ni 35 Cr 25 Mo 5 compositionally complicated alloy (CCA). A HL structure was produced by single-step heat treatment (800 °C for 1h) after cold rolling. This HL structure consists of alternative lamellae regions of coarse-grained FCC matrix (5∼20 μm), and regions containing ultra-fine grains or subgrains (200∼500 nm) together with nanoprecipitates (20-500 nm) and annealing twins. The 800 °C annealed sample with HL structure demonstrated a superior tensile property, with yield strength over 1.0 GPa and ductility of ~13%. Formation of the annealing twins and nanoprecipitates decorated HL structure was a result of the concurrent partial recrystallization and precipitation of σ phase at the shear bands with a high density of lattice defects (e.g. high-density dislocation walls and deformation twins). The latter restricted the growth of recrystallized grains, leading to the formation of ultrafine subgrains within the HL structure. The high yield strength resulted from the multistage hetero-deformation induced (HDI) strengthening and precipitation strengthening associated with heterogeneous lamella structures containing nanoprecipitates. The ductility was originated from the coexistence of multiple deformation mechanisms, which started with dislocation slip and formation of stacking faults at the initial stage, followed by nano-twinning at the higher strain level. This HL design strategy, comprising of composition and thermomechanical process designs, and the resultant microstructure tuning, open a broader window for development of cost-effective CCAs with enhanced performance.

Suggested Citation

Yin, Yu and Tan, Qiyang and Sun, Qiang and Ren, Wangrui and Zhang, Jingqi and Liu, Shiyang and Liu, Yingang and Bermingham, Michael and Chen, Houwen and Zhang, Ming-Xing, Heterogeneous Lamella Design to Tune the Mechanical Behaviour of a New Cost-Effective Compositionally Complicated Alloy (December 2020). Available at SSRN: https://ssrn.com/abstract=3751555 or http://dx.doi.org/10.2139/ssrn.3751555

Yu Yin (Contact Author)

University of Queensland - School of Mechanical and Mining Engineering

St Lucia
Brisbane, Queensland 4072
Australia

Qiyang Tan

University of Queensland - School of Mechanical and Mining Engineering

St Lucia
Brisbane, Queensland 4072
Australia

Qiang Sun

University of Queensland - School of Mechanical and Mining Engineering

St Lucia
Brisbane, Queensland 4072
Australia

Wangrui Ren

Chongqing University - College of Material Science and Engineering ( email )

Chongqing 400044, Chongqing 400030
China

Jingqi Zhang

University of Queensland - School of Mechanical and Mining Engineering ( email )

St Lucia
Brisbane, Queensland 4072
Australia

Shiyang Liu

University of Queensland - School of Mechanical and Mining Engineering

St Lucia
Brisbane, Queensland 4072
Australia

Yingang Liu

University of Queensland - School of Mechanical and Mining Engineering ( email )

St Lucia
Brisbane, Queensland 4072
Australia

Michael Bermingham

University of Queensland - School of Mechanical and Mining Engineering

St Lucia
Brisbane, Queensland 4072
Australia

Houwen Chen

Chongqing University - College of Material Science and Engineering ( email )

Chongqing 400044, Chongqing 400030
China

Ming-Xing Zhang

University of Queensland - School of Mechanical and Mining Engineering ( email )

St Lucia
Brisbane, Queensland 4072
Australia

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