A correlation between micro- and nano-indentation on materials irradiated by high-energy heavy ions

Yang, Yitao; Zhang, Chonghong; Ding, Zhaonan; Su, Changhao; Yan, Tingxing; Yin, Shi; Cheng, Yuguang

doi:10.1016/j.jnucmat.2017.10.025

Cited by 36 publications

(11 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hence, the hardening of the 40% CW + annl specimens was compared with previous data to investigate the effectiveness of the sink strength provided by bubbles. Considering that irradiation hardening was exhibited as yield strength in units of MPa or nano-hardness in units of GPa in some works, empirical relations, such as Δσ y ≈ 3ΔH v [69] and ΔH v = 81.0ΔH nano [70],z were used to convert these data to Vickers hardness data for a direct comparison. The results are shown in figure 17.…”

Section: Discussionmentioning

confidence: 99%

Effect of cold work deformationon irradiation hardening of vanadium alloys

et al. 2022

Self Cite

View full text Add to dashboard Cite

Vanadium alloys have been regarded as the promising candidate structure materials for the advanced blanket concept in fusion reactor due to the low activation, good high-temperature strength and especially the compatibility with liquid lithium. In the present work, six kinds of V-5Cr-5Ti alloys under heavily cold work with deformation amounts of 40%, 60% and 80%, and/or subsequent annealing were investigated. Irradiation damage of 0.1, 0.3 and 0.5 dpa was introduced in both specimens by using 352.8 MeV Fe ions at 100 ℃. Electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) were used to investigate pre-irradiation microstructures such as grains, dislocations, precipitates, and bubbles. XRD was used to evaluate the pre-existing dislocation density and TEM was used to image irradiation defects. Change in hardness was evaluated by using micro-hardness tests. Before irradiation, hardness increased with increasing deformation amount but decreased after subsequent annealing. Dislocation cells turning into sub-grains with low-angle boundaries was observed while deformation amount reaching 80% in cold-worked specimens. After irradiation, hardening was observed in all specimens and doses, and a power-law relation was observed in dose dependent hardening. Effect of initial microstructure on irradiation hardening was discussed in terms of sink strength while ignoring grains and precipitates due to their large size. Pre-existing bubbles could effectively reduce irradiation hardening while compared with previous papers. Meanwhile, with increasing sink strength of dislocations, hardening decreased in a different manner in cold-worked and annealed specimens. Irradiation defects in some specimens were investigated to clarify the inherent mechanism in the relation between initial microstructures and irradiation hardening.

show abstract

Section: Discussionmentioning

confidence: 99%

Effect of cold work deformationon irradiation hardening of vanadium alloys

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…If the results obtained by these two methods agree well, then the credibility of the method is proven, and the credibility of mechanical properties of σ-phase obtained by this method could be proven indirectly. By comparing the hardness Young's modulus and yield strength obtained by nano-indentation test (H 0 = 2.51 GPa, which is equivalent to about HV = 251 [49,50], E 0 = 135 GPa, and σ y0 = 0.294 GPa) and macro mechanical test (HV = 245, E = 165 GPa, and σ y = 0.32 GPa), it can be concluded that the two hardness values are in good agreement. However, the yield strength and Young's modulus measured by uniaxial tensile test are ≈10% and 20% higher, respectively, than those measured by the nano-indentation test.…”

Section: Credibility Of Mechanical Properties Obtained By Nano-indent...mentioning

confidence: 99%

Mechanical Properties of σ-Phase and Its Effect on the Mechanical Properties of Austenitic Stainless Steel

et al. 2022

View full text Add to dashboard Cite

In this present paper, the mechanical properties of σ-phase and its effect on the mechanical properties of 304H austenitic stainless steel after servicing for about 8 years at 680–720 °C were studied by nano-indentation test, uniaxial tensile test, and impact test. The results showed that the nano-hardness (H), Young’s modulus (E), strain hardening exponent (n), and yield strength (σy) of σ-phase were 14.95 GPa, 263 GPa, 0.78, and 2.42 GPa, respectively. The presence of σ-phase increased the hardness, yield strength, and tensile strength, but greatly reduced the elongation and impact toughness of the material.

show abstract

“…The main purpose of such scientific research is to determine the effectiveness of the use of these or those types of structural materials, as well as the search for new types of materials capable of working at high temperatures and a strong radiation background [4,5]. The main requirements imposed on all new types of structural materials that are considered as candidate materials for nuclear power engineering are high resistance to radiation damage, resistance to swelling resulting from transmutation reactions or fission fragments, and retention of strength and thermal conductivity properties for a sufficiently long time of operation [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Study of the Effect of Y2O3 Doping on the Resistance to Radiation Damage of CeO2 Microparticles under Irradiation with Heavy Xe22+ Ions

et al. 2021

View full text Add to dashboard Cite

This paper presents the results of a study on the influence of Y2O3 doping on the resistance to radiation damage and an assessment of structural changes associated with the accumulation of radiation defects in CeO2 microparticles under irradiation with heavy Xe22+ ions. The relevance of this study consists of the prospects for the use of CeO2 microparticles as materials and candidates of inert matrices of nuclear fuel. A method of solid-phase synthesis was applied to obtain microparticles with different concentrations of dopant. It included grinding of CeO2 and Y2O3 microparticles followed by thermal sintering at 1100 °C in an oxygen-containing medium to produce highly ordered microparticles. During the study of the structural characteristics of the synthesized microparticles, it was found that increasing the dopant concentration from 0.05 mol.% to 0.15 mol.% leads to an increase in the crystallinity degree as well as a decrease in dislocation density. According to the results of the assessment of the resistance of microparticles to radiation damage, it was found that an increase in the dopant concentration leads to a decrease in swelling and structural distortion by more than 2.5–3 times, which indicates an increase in the radiation resistance.

show abstract

A correlation between micro- and nano-indentation on materials irradiated by high-energy heavy ions

Cited by 36 publications

References 25 publications

Effect of cold work deformationon irradiation hardening of vanadium alloys

Effect of cold work deformationon irradiation hardening of vanadium alloys

Mechanical Properties of σ-Phase and Its Effect on the Mechanical Properties of Austenitic Stainless Steel

Study of the Effect of Y2O3 Doping on the Resistance to Radiation Damage of CeO2 Microparticles under Irradiation with Heavy Xe22+ Ions

Contact Info

Product

Resources

About