The annealing characteristics of pure molybdenum bars manufactured by a modified technique

Wang, Tan; Guo, Muxing; Cao, Lingfei; Shen, Kun; Wang, Mingpu

doi:10.1016/j.jallcom.2007.08.058

Cited by 14 publications

(2 citation statements)

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“…The resulting properties can differ based on factors like the heating and cooling rates, duration of holding, and the number of iterations performed [14][15][16][17]. Several studies have shown that annealing can result in a significant change in the ductility [18], strength [19], and hardness [20] of polycrystalline Mo. For instance, Wang et al [18] showed from three-point bend experiments that ductility increases with an increase in annealing temperature and attains a peak at around 1253 K and begins to drop thereafter.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have shown that annealing can result in a significant change in the ductility [18], strength [19], and hardness [20] of polycrystalline Mo. For instance, Wang et al [18] showed from three-point bend experiments that ductility increases with an increase in annealing temperature and attains a peak at around 1253 K and begins to drop thereafter. By contrast, Suzuki et al [21] reported insignificant change in ductility even after annealing at 1773 K. The tension experiments on polycrystalline Mo showed a gradual reduction in yield strength even after low-temperature annealing (i.e., annealing temperature is less than the recrystallisation temperature of  900 C) [19].…”

Section: Introductionmentioning

confidence: 99%

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The effect of annealing on micro-hardness of molybdenum single crystals

Bhowmik,

Dadhich,

Singh

2024

Phys. Scr.

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Molybdenum (Mo) crystals exhibit excellent mechanical properties such as high yield strength, high elastic modulus, very high melting point, and excellent corrosion resistance, making them a suitable choice for various industrial applications. The mechanical behaviour of these crystals has been investigated through tension, compression, and indentation experiments. The indentation experiments on annealed Mo single-crystal thin film show an increase in hardness with increase in annealing temperature from 400 °C–650 °C. However, it is not clear whether this behaviour is specific to the Mo thin films or these are applicable to the bulk samples of single crystals also. In order to address these issues, the Vickers indentation experiments are performed on as-received and annealed samples of ( 1 00 ) -, ( 110 ) -, and ( 111 ) -oriented Mo single crystals. The results show that the low-temperature annealing leads to an increase in micro-hardness by 9 % for ( 100 ) oriented crystals. The x-ray diffraction (XRD), electron backscatter diffraction (EBSD) and energy dispersive x-ray spectroscopy (EDS) studies have shown that there is a drop in the number of dislocation sources or dislocation density ( ρ ) with no high-angle grain boundary formation or any microstructural changes or any oxide formation. This necessitates to enhance the applied stress required for significant yielding (or yield strength) which results in an increase in the hardness. Based on experimental observations, a hardening mechanism governed by dislocation annihilation during annealing has been proposed in the present study.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of annealing on micro-hardness of molybdenum single crystals

Bhowmik,

Dadhich,

Singh

2024

Phys. Scr.

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The Banded Structure and Its Effects on the Transverse Elongation and Textures of Mo Bars

et al. 2014

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The transverse elongation, microhardness, and microstructure of different pure molybdenum bars reduction were investigated at room temperature. The results show that the transverse elongation of draw‐forged pure Mo bars is gradually improved as the reduction of upsetting increases, which approaches a maximum value of 5% after upsetting to 80%. In the draw‐forged molybdenum bars, it forms a 〈011〉 fiber texture. After upsetting deformation, 〈100〉 + 〈111〉 fiber textures are formed. Meanwhile, the orientation density of 〈100〉 fiber and 〈111〉 fiber increases gradually with the increasing reduction of upsetting deformation. The plastic deformation is much heavier and non‐homogeneous in 〈111〉 orientation than that in 〈100〉 orientation. Many banded microstructures, especially microshear bands, are formed in 〈111〉 orientation. Meanwhile, many equiaxed dislocation cells are formed in 〈100〉 orientation. Two models are proposed to explain the evolution of texture. The formation of a 〈110〉 fiber or a 〈100〉 fiber can be explained by a cross‐slip mechanism, and the formation of a 〈111〉 fiber can be explained by a microshear banding mechanism.

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In situ SEM observation of microscale strain fields around a crack tip in polycrystalline molybdenum

Jin

et al. 2016

Appl. Phys. A

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The annealing characteristics of pure molybdenum bars manufactured by a modified technique

Cited by 14 publications

References 20 publications

The effect of annealing on micro-hardness of molybdenum single crystals

The effect of annealing on micro-hardness of molybdenum single crystals

The Banded Structure and Its Effects on the Transverse Elongation and Textures of Mo Bars

In situ SEM observation of microscale strain fields around a crack tip in polycrystalline molybdenum

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