Effect of mechanical alloying process on microstructure and mechanical properties of ODS tungsten heavy alloys

Lee, Kyong H.; Seung, I.; Ryu, Ho Jin; Dilmore, M. F.; Hong, Soon Hyung

doi:10.1016/j.jallcom.2006.08.284

Cited by 40 publications

(4 citation statements)

References 13 publications

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“…It is shown that cerium compounds act as heterogeneous nucleation sites and are uniformly distributed among the dendrites and at the grain boundary of the n-CeO 2 /NBA coating. It is also concluded that n-CeO 2 has an adsorbent effect among grains and a sticking effect at grain boundaries [17]. Figure 6 shows the surface distribution of Ce element in the 1.5% n-CeO 2 /NBA coating.…”

Section: Microstructure Of the Coatingsmentioning

confidence: 92%

Microstructure and corrosion resistance of Ni-based alloy laser coatings with nanosize CeO₂addition

Zhang

Yoon

et al. 2008

Science and Technology of Advanced Materials

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Micron-size Ni-base alloy (NBA) powders were mixed with both 1.5 wt.% (hereinafter %) micron-size CeO 2 (m-CeO 2 ) and also 1.5% and 3.0% nano-size CeO 2 (n-CeO 2 ) powders. These mixtures were coated on low-carbon steel (Q235) by 2.0 kW CO 2 laser cladding. The effects on the microstructures, phases and electrochemical corrosion of the coatings upon the addition of m-and n-CeO 2 powders to NBA (m-and n-CeO 2 /NBA) have been investigated. The results showed that a smooth coating was prepared under suitable processing parameters (P = 2.0 kW, V = 180 mm min −1 ) by adding 1.5% n-CeO 2 . In addition to the primary phases of γ -Ni, Cr 23 C 6 and Ni 3 B in the Ni-base alloy coating, CeNi 3 was formed in Ni-base alloy coatings with both n-CeO 2 and m-CeO 2 particles, and CeNi 5 appeared in the coating upon decreasing the size of CeO 2 particles. Well-developed dendrites were observed in the Ni-base alloy coating; directional dendrites grew at the interface in the coating upon the addition of m-CeO 2 , whereas fine and multioriented dendrites grew upon decreasing the size of CeO 2 particles to the nanoscale. Actinomorphic dendrites and compact equiaxed dendrites grew from the interface to near the surface upon increasing the content of n-CeO 2 from 1.5 to 3.0%. In strongly acidic HNO 3 solution, the severe corrosion of dendrites occurred and there were many corrosion pits in the Ni-base alloy coating; intercrystalline corrosion also has a dominant role upon the addition of m-CeO 2 , whereas uniform corrosion occurs in the coating as the size of CeO 2 particles is decreased to nanoscale.

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Section: Microstructure Of the Coatingsmentioning

confidence: 92%

Microstructure and corrosion resistance of Ni-based alloy laser coatings with nanosize CeO₂addition

Zhang

Yoon

et al. 2008

Science and Technology of Advanced Materials

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“…During ball milling, the harder the powder is, the more complex the recovery process is, and the smaller the grain size that can be achieved by ball milling. In addition, the higher the hardness of the material is, the higher the dislocation slip is to carry out, and the dislocation density in the lattice is higher, which provides a fast diffusion channel for the alloying process [40], which further speeds up the alloying process. During the time spent ball milling, an enormous number of crashes happen between ball and powder ball, and the captured powder deforms seriously under the impact, making the powder subjected to the "miniature" forging action of the two collision balls.…”

Section: Mechanical Alloyingmentioning

confidence: 99%

Mechanical and Biological Properties of Titanium and Its Alloys for Oral Implant with Preparation Techniques: A Review

Wu,

Chen,

Kong

et al. 2023

Materials

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Dental implants have revolutionised restorative dentistry, offering patients a natural-looking and durable solution to replace missing or severely damaged teeth. Titanium and its alloys have emerged as the gold standard among the various materials available due to their exceptional properties. One of the critical advantages of titanium and its alloys is their remarkable biocompatibility which ensures minimal adverse reactions within the human body. Furthermore, they exhibit outstanding corrosion resistance ensuring the longevity of the implant. Their mechanical properties, including hardness, tensile strength, yield strength, and fatigue strength, align perfectly with the demanding requirements of dental implants, guaranteeing the restoration’s functionality and durability. This narrative review aims to provide a comprehensive understanding of the manufacturing techniques employed for titanium and its alloy dental implants while shedding light on their intrinsic properties. It also presents crucial proof-of-concept examples, offering tangible evidence of these materials’ effectiveness in clinical applications. However, despite their numerous advantages, certain limitations still exist necessitating ongoing research and development efforts. This review will briefly touch upon these restrictions and explore the evolving trends likely to shape the future of titanium and its alloy dental implants.

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“…Therefore, it is imperative to seek new materials with outstanding physical and chemical performances as alterna-tive materials to withstand the harsh fusion environments in the future. Dispersion strengthened alloys have attracted more attention and been proposed as the hopeful alternative due to their better ductility, more excellent mechanical properties, and lower DBTT than pure W, as well as reduced hardening and embrittlement [13][14][15][16]. Recently, it has been reported that dispersing a small amount of thermal-stable carbide (e.g.…”

Section: Introductionmentioning

confidence: 99%

Surface blistering and deuterium retention behaviors in pure and ZrC-doped tungsten exposed to deuterium plasma

et al. 2021

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Surface blistering and deuterium (D) retention behaviors in pure tungsten (W) and 0.5 wt% ZrC-doped W alloy (WZC) exposed to D plasma have been investigated as a function of incident D fluence up to 2.6 × 1025 D m−2. Surface observations show that large-sized blisters (∼8–10 μm) and a few small blisters (<2 μm) are formed on the W samples. For WZC, the surface of the samples is covered by a high density of small blisters (<1 μm), and no blister larger than 2 μm is found. Cross section views show that the large-sized blisters originate from subsurface grain boundaries, and the small blisters originate from intra-granular cavities at depths much closer to the surface. The intra-granular blisters are preferentially formed on the grains with a normal direction close to [111] for both types of sample. The inter-granular blisters formed in pure W are significantly suppressed in WZC, and the fluence threshold for blister formation in WZC is lower than that in W. The D depth distributions indicate that the implanted D is mainly retained in the near-surface region of WZC and W. Besides, a higher and broader D peak is observed at a depth of between 0.1–0.25 μm in WZC, but the intensity and width of the D peak is lower and thinner in W. The desorption spectra of WZC shift to the lower temperature side as compared to W, and the total retained D amount in WZC and W is comparable in the fluence range of 2.8 × 1024–2.6 × 1025 D m−2.

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Effect of mechanical alloying process on microstructure and mechanical properties of ODS tungsten heavy alloys

Cited by 40 publications

References 13 publications

Microstructure and corrosion resistance of Ni-based alloy laser coatings with nanosize CeO₂addition

Microstructure and corrosion resistance of Ni-based alloy laser coatings with nanosize CeO₂addition

Mechanical and Biological Properties of Titanium and Its Alloys for Oral Implant with Preparation Techniques: A Review

Surface blistering and deuterium retention behaviors in pure and ZrC-doped tungsten exposed to deuterium plasma

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Effect of mechanical alloying process on microstructure and mechanical properties of ODS tungsten heavy alloys

Cited by 40 publications

References 13 publications

Microstructure and corrosion resistance of Ni-based alloy laser coatings with nanosize CeO2addition

Microstructure and corrosion resistance of Ni-based alloy laser coatings with nanosize CeO2addition

Mechanical and Biological Properties of Titanium and Its Alloys for Oral Implant with Preparation Techniques: A Review

Surface blistering and deuterium retention behaviors in pure and ZrC-doped tungsten exposed to deuterium plasma

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Microstructure and corrosion resistance of Ni-based alloy laser coatings with nanosize CeO₂addition

Microstructure and corrosion resistance of Ni-based alloy laser coatings with nanosize CeO₂addition