In situ TEM observation of the microstructural characteristics and mechanical properties of vacuum hot-press sintered Co–30Cr–6Mo alloys

Chang, Shih-Hsien; Lin, Lung-Yi; Huang, Kuo-Tsung

doi:10.1016/j.vacuum.2020.109333

Cited by 7 publications

(14 citation statements)

References 22 publications

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“…Furthermore, a four-point probe (LRS4-TG2) was used to measure the electrical property. While, the crystalline structure and the atomic models of TEM analysis were simulated by Carine and Vesta crystal structure simulation software [12].…”

Section: Methodsmentioning

confidence: 99%

“…Meanwhile, R bm was TRS, which are determined as the fracture stress in the surface zone. The calculated equation as following [11,12]:…”

Section: Methodsmentioning

confidence: 99%

“…The highest sintered density (8.93 ± 0.01 g•cm −3 ) and lowest open porosity (0.08 ± 0.02%) appeared at 1200°C, respectively. The previous literature pointed out that the appropriate high temperature can effectively help the sintering reaction to proceed [12]. In other words, enhancing the hot pressing temperatures (1100°C → 1200°C) provided an increased driving force for the sintering mechanism, which helped the atomic diffusion due to the external pressure (at 20 MPa).…”

Section: Effects Of Vacuum Hot Pressing Temperature On Ni-35mo-15cr A...mentioning

confidence: 99%

“…However, the powder metallurgy (PM) route offers the advantage of eliminating casting defects such as porosity, chemical inhomogeneity, and refining the grain size, which effectively improves the material properties [11]. One of the important advantages of PM compared to other methods is having better control on the microstructure, where better distribution of the reinforcements is possible in PM compact [11,12]. On the other hand, high-quality materials may be fabricated using a feasible method, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the vacuum hot pressing process on the mechanical properties, microstructures and material characteristics of Ni–35Mo–15Cr alloys

Chang

Hsiao

Huang³

2021

Powder Metallurgy

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This study fabricated Ni-35Mo-15Cr alloys by the vacuum hot pressing technique. The experiments utilised various hot pressing temperatures (1050°C, 1100°C, 1150°C, and 1200°C) and pressures (20, 35, and 50 MPa) to determine the optimal parameters for Ni-35Mo-15Cr alloys. The experimental result showed that the optimal hot pressing parameters of this alloy were 1150°C at 35 MPa for 1 h. Among them, the sintering density reached 8.92 g•cm −3 , and the hardness and TRS increased to 77.1 HRA and 1218.2 MPa, respectively; while, the electrical conductivity was 7.08 × 10 3 S cm −1 and the polarisation resistance was 294.65 Ω•cm 2 . Furthermore, the TEM observation identified the HCP structures of the Mo 2 C that precipitated in the Ni-35Mo-15Cr alloys, and the [02 21] and [01 12] crystal axis of Mo 2 C can be found. Overall, the properties of Ni-35Mo-15Cr alloys were effectively improved through the hot pressing process.

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Section: Methodsmentioning

confidence: 99%

“…Meanwhile, R bm was TRS, which are determined as the fracture stress in the surface zone. The calculated equation as following [11,12]:…”

Section: Methodsmentioning

confidence: 99%

Section: Effects Of Vacuum Hot Pressing Temperature On Ni-35mo-15cr A...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of the vacuum hot pressing process on the mechanical properties, microstructures and material characteristics of Ni–35Mo–15Cr alloys

Chang

Hsiao

Huang³

2021

Powder Metallurgy

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“…structure of the obtained sintered products, resulting in a deterioration of their mechanical properties [2,10,13,14].…”

Section: New Technologies Of Production and Processing Of Materialsmentioning

confidence: 99%

Influence of Energy-Mechanical Treatment on Structure-Mechanical Properties of Co–Cr–Mo Alloys Obtained by Spark Plasma Sintering

Minh¹,

Hiệp

Konyukhov

et al. 2021

Inorg. Mater. Appl. Res.

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We investigate the influence of preliminary energy-mechanical treatment (EMT) of the initial Co-Cr-Mo-based powders in the vortex layer of ferromagnetic bodies on the structure-mechanical properties of products obtained by the spark plasma sintering (SPS). To study the properties of the powder and the sintered samples, we employed the scanning electron microscopy (SEM), the optical microscopy, the value determination of the flexural strength and the microhardness on the Vickers scale. We show that the shorttime EMT of the powders (1-3 min) in the vortex layer of ferromagnetic bodies results in severe plastic deformation of the majority of the rounded particles of the original powder: they form particles of irregular shape including plates with increased surface roughness. As a result, this treatment influences positively their spark plasma sintering process and makes it possible to produce densely compact sintered material with a lowporosity structure. We discover that the sample preliminarily passing the 3-min EMT compacts densely during sintering (the relative density being 98.3%) and obtains improved mechanical properties (the microhardness and the flexural strength values being by 16% and 14%, respectively, higher than those for the sample without treatment). This improvement of structure-mechanical properties of the EMT-passed sintered samples results from intensification of the diffuse mass transfer during sintering due to the plastic deformation of the material, modification of the shape, the surface condition of the powder particles, and the increase of the total contact area between them. The increased surface roughness and the particle shape deviation from that regular lead to a decrease in the radii of curvature of their contact surfaces and thus an increase in the Laplace force magnitudes, playing the dominant role in the diffusion mass transfer during sintering.

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Effects of suspension processing conditions on the multi-scale structural changes of photocured SiO2 bodies during sintering process: An operando observation using optical coherence tomography

Iijima

Arita

Fujishiro

et al. 2022

Advanced Powder Technology

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In situ TEM observation of the microstructural characteristics and mechanical properties of vacuum hot-press sintered Co–30Cr–6Mo alloys

Cited by 7 publications

References 22 publications

Investigation of the vacuum hot pressing process on the mechanical properties, microstructures and material characteristics of Ni–35Mo–15Cr alloys

Investigation of the vacuum hot pressing process on the mechanical properties, microstructures and material characteristics of Ni–35Mo–15Cr alloys

Influence of Energy-Mechanical Treatment on Structure-Mechanical Properties of Co–Cr–Mo Alloys Obtained by Spark Plasma Sintering

Effects of suspension processing conditions on the multi-scale structural changes of photocured SiO2 bodies during sintering process: An operando observation using optical coherence tomography

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