High-velocity projectile impact induced 9R phase in ultrafine-grained aluminium

Xue, Sichuang; Fan, Zhe; Lawal, Olawale B.; Thevamaran, Ramathasan; Li, Qiang; Liu, Yue; Kobayashi, Yu; Wang, Jian; Thomas, Edwin L.; Wang, Haiyan; Zhang, Xinghang

doi:10.1038/s41467-017-01729-4

Cited by 82 publications

(15 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The combination of high pressures, temperatures, and deformation rates that occur during an impact can evoke many unusual materials responses. These include crater formation 1 – 3 , solid state splashing 4 , impact bonding 5 , peculiar phase transformations 6 , nanocrystallization 7 , and chemical reactions 8 . Among the most extreme of such phenomena lies impact-induced erosion that often occurs at the micron scale whether in space 9 , on the ground 10 , or beneath 11 .…”

Section: Introductionmentioning

confidence: 99%

Melt-driven erosion in microparticle impact

et al. 2018

View full text Add to dashboard Cite

Impact-induced erosion is the ablation of matter caused by being physically struck by another object. While this phenomenon is known, it is empirically challenging to study mechanistically because of the short timescales and small length scales involved. Here, we resolve supersonic impact erosion in situ with micrometer- and nanosecond-level spatiotemporal resolution. We show, in real time, how metallic microparticles (~10-μm) cross from the regimes of rebound and bonding to the more extreme regime that involves erosion. We find that erosion in normal impact of ductile metallic materials is melt-driven, and establish a mechanistic framework to predict the erosion velocity.

show abstract

Section: Introductionmentioning

confidence: 99%

Melt-driven erosion in microparticle impact

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The formation of the 9R phase is not energetically favorable for Al, and even if the 9R phase can be formed, it is often not stable [24]. Under projectile impact induced high-strain-rate deformation, the 9R phase has been observed in pure Al film during post-mortem TEM analysis [12]. The formation of the 9R phase in Al-Co alloy warrants further discussions.…”

Section: Discussionmentioning

confidence: 99%

“…There are much fewer studies on the mechanical properties of twinned Al or Al alloys due to the high SFEs [11]. Deformation twins have been spotted sporadically under high-strainrate deformation [12,13] or in nanocrystals [14,15]. It is still a challenge to fabricate high-density twins in high SFE metals.…”

Section: Introductionmentioning

confidence: 99%

High strength, deformable nanotwinned Al–Co alloys

Xue

Xie

et al. 2018

Materials Research Letters

Self Cite

View full text Add to dashboard Cite

Aluminum (Al) alloys have been widely used in the transportation industry. However, most highstrength Al alloys to date have limited mechanical strength, on the order of a few hundred MPa, which is much lower than the flow stress of high-strength steels. In this study, we show the fabrication of nanocrystalline Al alloys with high-density growth twins enabled by a few atomic percent of Co solute. In situ uniaxial compression tests show that the flow stress of Al-Co solid solution alloys exceeds 1.5 GPa, while good work hardening capability is maintained. This study provides a new perspective on the design of high-strength Al alloys for various applications. IMPACT STATEMENTThe flow stress of Al-Co alloys with high-density growth twins exceeds 1.5 GPa, while maintaining good work hardening capability. The twins are stabilized by Co impurities based on DFT calculations.

show abstract

“…However, it has recently been reported that when preparing Al/AlN nano-multi-layer films, long-period stacking 9R phases are also found in the Al layer. [48] AlFe alloy film prepared by magnetron sputtering also formed a high-density period stacking phase. [49] And the FCC and HCP in our structure are also arranged regularly, and may also be a long-period stacking structure.…”

Section: Structure Evolution During Solidificationmentioning

confidence: 99%

Research on homogeneous nucleation and microstructure evolution of aluminium alloy melt

Zhan

Qin

2021

R. Soc. open sci.

View full text Add to dashboard Cite

In this paper, based on the embedded atom method (EAM) potential, molecular dynamics simulations of the solidification process of Al–4 at.%Cu alloy is carried out. The Al–Cu alloy melt is placed at different temperatures for isothermal solidification, and each stage of the entire solidification process is tracked, including homogeneous nucleation, nucleus growth, grain coarsening and microstructure evolution. In the nucleation stage, the transition from high temperature to low temperature manifests a change from spontaneous nucleation mode to divergent nucleation mode. The critical nucleation temperature of the Al–Cu alloy is determined to be about 0.42 T m ( T m is the melting point of Al–4 at.%Cu) by calculating the nucleation rate and the crystal nucleus density. In the nucleus growth stage, two ways of growing up are observed, that is, a large crystal nucleus will absorb a smaller heterogeneous crystal nucleus, and two very close crystal nuclei will merge. In the microstructure evolution of the isothermally solidified Al–Cu alloy, it is emerged that the interior of all nanocrystalline grains are long-period stacking structure composed of face centred cubic (FCC) and hexagonal close-packed (HCP). These details provide important information for the production of Al–Cu binary alloy nano-polycrystalline products.

show abstract

High-velocity projectile impact induced 9R phase in ultrafine-grained aluminium

Cited by 82 publications

References 56 publications

Melt-driven erosion in microparticle impact

Melt-driven erosion in microparticle impact

High strength, deformable nanotwinned Al–Co alloys

Research on homogeneous nucleation and microstructure evolution of aluminium alloy melt

Contact Info

Product

Resources

About