Microstructure and mechanical behavior of nanotwinned AlTi alloys with 9R phase

Zhang, Y.F.; Xue, Sichuang; Li, Qiang; Fan, Cuncai; Su, Rong; Ding, Jie; Wang, Han; Wang, H.; Zhang, X.

doi:10.1016/j.scriptamat.2018.01.010

Cited by 51 publications

(10 citation statements)

References 49 publications

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“…Interestingly, increasing the Zr content leads to broader patches of 9R phase, with some phases expanding across multiple columns (beyond 100 nm). Figure 4(a) compares the Hall-Petch plot from this study with other NT Al alloys, nanocrystalline (NC) Al alloys, and NT Cu [9,13,[30][31][32]39]. It is evident the hardness of NT Al-Zr increases from 1.7 GPa in the Al-3Zr films to 4.2 GPa in the Al-10Zr films, far beyond the NC Al alloys and NT Cu.…”

Section: Resultsmentioning

confidence: 77%

“…where G is the shear modulus of the alloy, a solv and a are the lattice parameter of Al and the alloy, respectively. α is taken to be 0.0235, a material dependent factor calculated for Ni-W alloys, that was determined to be suitable for these solid solution nt Al alloys [31,35]. For this calculation, it is assumed that both dG/dc and da/dc are linear with solute concentration.…”

Section: Discussionmentioning

confidence: 99%

“…Later, it was revealed that TBs could be introduced into sputtered Al by tailoring the film thickness and texture [28,29]. Recently, various sputtered binary Al-X (X = Fe, Ti, Ni, Co, Mg) alloy systems have been shown to have abundant ITBs [30][31][32][33][34][35][36]. These boundaries in Al are strong barriers to dislocation motion, as demonstrated by in-situ nanoindentation [22].…”

Section: Contact X Zhangmentioning

confidence: 99%

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Microstructural evolution of nanotwinned Al-Zr alloy with significant 9R phase

Richter

Zhang

Xie

et al. 2020

Materials Research Letters

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Aluminum (Al) alloys have a multitude of applications, notably in the automotive, aerospace and coating industries, yet they exhibit significantly lower mechanical strength than conventional steels. Nanotwins drastically improve mechanical strength while retaining ductility. However, the high SFE of Al largely prevents twinning. Here, we synthesize Al-Zr alloy films containing an abundance of incoherent twin boundaries and 9R phases. These alloys exhibit an extended solid solubility of Zr, retaining a columnar nanotwinned structure across all compositions. These films reach a hardness up to 4.2 GPa with 10 at% Zr and demonstrate the capacity for producing strong Al alloys with nanotwins.

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Section: Resultsmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Contact X Zhangmentioning

confidence: 99%

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Microstructural evolution of nanotwinned Al-Zr alloy with significant 9R phase

Richter

Zhang

Xie

et al. 2020

Materials Research Letters

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“…This growth-twin formation mechanism also applies to co-sputtered Al alloys grown epitaxially on Si (111) substrate. For instance, Zhang et al [23] observed high-density ITBs in sputtered Al-Ti thin films. Adding Co solute may drastically increase the energy barrier for the diffusion of Al atoms, resulting in fine columnar grains.…”

Section: Discussionmentioning

confidence: 99%

High strength, deformable nanotwinned Al–Co alloys

Xue

Xie

et al. 2018

Materials Research Letters

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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.

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“…Our study suggests that using appropriate solutes may effectively stabilize 9R phase in various metallic materials. Recently, high-density 9R phase has also been reported in sputtered NT Al-Fe [89], Al-Ti [90] and Al-Mg [91] solid solution alloys. These studies reveal that 9R phase is also beneficial for improving the mechanical properties (high strength and plasticity) of NT metals.…”

Section: Mechanisms Of Irradiation Stability Of Nanotwins In Nt-cu 97mentioning

confidence: 97%