Investigation on the ballistic induced nanotwinning in the Mn-free Fe27Co24Ni23Cr26 high entropy alloy plate

Chung, Tsai-Fu; Chiu, Pao‐Hsiung; Tai, Cheng-Ling; Li, Youlin; Wang, Lemin; Chen, Chih-Yuan; Hsiao, Chien-Nan; Ou, Da-Zheng; Wang, Shing-Hoa; Yang, Jer−Ren

doi:10.1016/j.matchemphys.2021.124707

Cited by 16 publications

(3 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because of their superior mechanical properties, especially the excellent strain hardening ability, the HEAs have great potential to be used for ballistic protection. However, there are very limited reports regarding the application or potential application of HEAs in ballistic protection (29)(30)(31). Both dislocations and deformation TW were observed near bullet holes on HEAs and were considered responsible for their antiballistic performance (30,31).…”

Section: Introductionmentioning

confidence: 99%

“…However, there are very limited reports regarding the application or potential application of HEAs in ballistic protection (29)(30)(31). Both dislocations and deformation TW were observed near bullet holes on HEAs and were considered responsible for their antiballistic performance (30,31). However, in situ observations of dynamic response of the HEAs to ballistic impact are in lack or very limited for further fundamental understanding, and the influence of chemical composition to the alloys' ballistic performance is not included in the experimental studies.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic response of high-entropy alloys to ballistic impact

Tang

2022

Sci. Adv.

View full text Add to dashboard Cite

High-entropy alloys (HEAs) are promising to provide effective antiballistic capability because of their superior mechanical properties. However, the twinning-active Cantor alloy is found less ballistic resistant, compared with its Mn-free companion. It is unclear how the HEAs resist ballistic impact and why Mn does not benefit the ballistic resistance. Here, we used molecular dynamics simulations to investigate the ballistic resistances of CrMnFeCoNi and CrFeCoNi and elucidate underlying mechanisms. It is shown that the alloys’ ballistic resistances dominantly benefit from active dislocations generated at higher strain rates. Stronger atomic bonding and higher dislocation densities make the CrFeCoNi easier to be strain hardened with elevated toughness to resist high-speed deformation, while weaker atomic bonding and easier occurrence of dislocation tangling make CrMnFeCoNi less resistant to failure under ballistic impact. This work helps better understand the antiballistic behavior of HEAs and guide the design of armor and energy-absorption materials.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic response of high-entropy alloys to ballistic impact

Tang

2022

Sci. Adv.

View full text Add to dashboard Cite

show abstract

“…The concept of high-entropy alloys (HEAs) and multicomponent alloys was introduced in 2004, challenging the traditional belief that alloys were composed of one or two dominant elements [7][8][9]. High-entropy alloys, which are near-equimolar-composition alloys comprising five or more principal elements, have been roughly divided into two groups according to the different constituent elements [9][10][11]: one is based on 3d transition metals Co, Cr, Cu, Fe, Mn, Ni, Ti, and V, which are called TM HEAs; the other is refractory HEAs (RHEAs) [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Hot Rolling on Microstructure and Properties of NbHfTiVC0.1 Refractory High-Entropy Alloy

Qiu,

Tao,

Jiang

et al. 2023

Metals

View full text Add to dashboard Cite

NbHfTiVC0.1 refractory high-entropy alloy (RHEA) exhibits excellent comprehensive mechanical properties and demonstrates great potential for applications. However, the mechanical properties need to be improved further. In this work, hot rolling on NbHfTiVC0.1 RHEA at temperatures of 650 °C, 850 °C, and 1050 °C, with total reductions of up to 30%, 50%, 70%, and 80%, was conducted. The microstructure and mechanical property evolution of the samples were further investigated. The hot-rolled samples at 650 °C and 850 °C exhibit a composition consisting of BCC, carbide, and Laves phases, whereas the samples rolled at 1050 °C only consist of BCC and carbide phases. The 650-80 sample displays the highest ultimate tensile strength (1354 MPa), and the 1050-80 sample demonstrates the highest elongation (16%). The highest strength observed in the 650 °C-80% sample can be attributed to the presence of fractured and refined carbides, fine-grains, and the hindrance of dislocation slip by the fine Laves phase. At a higher rolling temperature (1050 °C), the Laves phase disappears, resulting in a reduction in strength but an increase in plasticity. Furthermore, the dislocation slipping mechanism within the BCC matrix also contributes positively to plastic deformation, leading to a notable increase in ductility for the 1050 °C-80% sample. These research findings provide valuable insights into enhancing the strength and ductility simultaneously of NbHfTiVC0.1 RHEA through hot rolling.

show abstract