Increasing fracture strength in bulk metallic glasses using ultrasonic nanocrystal surface modification

Ma, Cunfei; Qin, Haifeng; Ren, Zhencheng; O'Keeffe, Stephanie C.; Stevick, Joseph; Doll, Gary L.; Dong, Yalin; Winiarski, B.; Ye, Chang

doi:10.1016/j.jallcom.2017.05.056

Cited by 22 publications

(5 citation statements)

References 45 publications

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“…In the UNSM process, as illustrated in Figure 1b, a tungsten-carbide ball with a diameter of 14 mm attached to an ultrasonic device scans over the material surface while striking it at a high frequency of 28 kHz, which is greater than the often used frequency of 20 kHz. Ma et al (2017) [20] utilized a tungsten carbide tip to streike the sample surface at 20 kHz frequency, and the compressive residual stresses with a maximum magnitude of 1130 MPa were induced in the near-surface region after UNSM treatment. Kheradmandfard et al (2017) [21] produced a gradient nanostructured layer by UNSM treatment, a ball-shaped tungsten carbide tip striking the surface of β-type titanium alloy with the frequency of 20 kHz.…”

Section: Sample Preparationsmentioning

confidence: 99%

Effects of Surface Severe Plastic Deformation on the Mechanical Behavior of 304 Stainless Steel

Yang

et al. 2020

Metals

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In this study, two innovative surface severe plastic deformation (SSPD) methods, namely abrasive waterjet peening (AWJP) and ultrasonic nanocrystal surface modification (UNSM), were applied to a 304 stainless steel to improve the mechanical behavior. The surface roughness, microstructure, residual stress, hardness, and tensile mechanical properties of the alloy after the two SSPD treatments were studied systematically. The results show that both the AWJP and UNSM treatments have greatly positive effects on the mechanical-properties improvements by successfully introducing a hardening layer. Especially the UNSM-processed specimen possesses the most outstanding comprehensive mechanical properties (high strength with the comparable ductility). The yield strength with the UNSM treatment is 443 MPa, corresponding to the 109% and 19% improvements, as compared to that of the base (212 MPa) and AWJP-treated specimens (372 MPa). The results can be attributed to a much thicker hardening layer (about 500 μm) and a better surface integrity with lower roughness (Ra: 0.10 μm) formed by the UNSM technique.

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Section: Sample Preparationsmentioning

confidence: 99%

Effects of Surface Severe Plastic Deformation on the Mechanical Behavior of 304 Stainless Steel

Yang

et al. 2020

Metals

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“…In recent years, many severe surface plastic deformation (SSPD) technologies, such as surface mechanical attrition treatment [ 3–5 ] and laser shock peening, [ 6–9 ] have attracted wide attention for their improvement of the surface strength of metallic materials. Ultrasonic nanocrystal surface modification (UNSM) [ 10–14 ] is an emerging SSPD technology that has attracted broad interest in recent years. In the UNSM process, a tungsten carbide (WC) tip strikes the samples at an ultrahigh frequency (20 kHz) as it burnishes the surface.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Laser‐Assisted Ultrasonic Nanocrystal Surface Modification on the Microstructure and Mechanical Properties of 300M Steel

Zhao

Liu

et al. 2020

Adv Eng Mater

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Herein, an innovative surface severe plastic deformation method, laser-assisted ultrasonic nanocrystal surface modification (LA-UNSM), is used to treat 300M ultra-high-strength steel. The results show that the synergistic effect of laser heating and ultrasonic striking results in a thicker plastic deformation layer in 300M steel compared with UNSM treatment alone. Moreover, the depth of the deformation layer gradually increases as the laser power level is increased. At the laser power of 68 W, the greatest thickness in the plastic deformation layer (%53.6 μm) is observed, which is 1.7 times the thickness in the UNSM-treated samples. In addition, the surface of 300M steel forms dense oxide following LA-UNSM treatment and the surface oxide concentration increases with laser power level. Because of the martensitic lath refinement, work hardening, and oxidation, the highest surface hardness is obtained after LA-UNSM treatment at 45 W. As higher plastic strain is induced when a smaller UNSM tip (1.5 mm) is used, the largest and deepest surface plastic deformation layer is obtained in the LA-UNSM-45 W-1.5 mm sample. However, the most significant hardness difference between LA-UNSM and UNSM is observed when the 4.0 mm tip is used. This study shows that LA-UNSM can effectively improve the hardness of highstrength metals.

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“…Recently, several surface treatments [21] were investigated in order to enhance the surface toughness of metallic glasses by effectively mitigating the propagation of shear bands and crack nucleation at the surface. These surface modification techniques, including mechanical surface treatment [22][23][24][25], surface coating [26][27][28] and thermal surface treatment [29][30], prevent shear band propagation through the introduction of compressive residual stresses in the surface region.…”

Section: Introductionmentioning

confidence: 99%

Surface hardening by gaseous oxidizing of (Zr55Cu30Al10Ni5)98Er2 bulk-metallic glass

Haratian

Grumsen

Villa

et al. 2019

Journal of Alloys and Compounds

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Increasing fracture strength in bulk metallic glasses using ultrasonic nanocrystal surface modification

Cited by 22 publications

References 45 publications

Effects of Surface Severe Plastic Deformation on the Mechanical Behavior of 304 Stainless Steel

Effects of Surface Severe Plastic Deformation on the Mechanical Behavior of 304 Stainless Steel

The Effects of Laser‐Assisted Ultrasonic Nanocrystal Surface Modification on the Microstructure and Mechanical Properties of 300M Steel

Surface hardening by gaseous oxidizing of (Zr55Cu30Al10Ni5)98Er2 bulk-metallic glass

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