Changes of Microstructures and Mechanical Properties in Commercially Pure Titanium after Different Cycles of Proposed Multi-Directional Forging

Zheng, Zhanguang; Zhang, Xiaoying; Xie, Liang; Huang, Longgui; Sun, Teng

doi:10.3390/met9020175

Cited by 9 publications

(3 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It means that the large grains indeed resulted from the dynamic recrystallization and grain growth during HPT. Such dynamic recrystallization during SPD have also been observed earlier in other materials like titanium‐based, magnesium‐based, aluminum alloys, copper alloys, and nickel‐based superalloys . These large recrystallized grains are predominantly typical twins intersecting with each other.…”

Section: Resultssupporting

confidence: 75%

Faceting of Twin Grain Boundaries in High‐Purity Copper Subjected to High Pressure Torsion

et al. 2019

View full text Add to dashboard Cite

The microstructure of high‐purity 5N5 copper processed by high pressure torsion (HPT) is studied. Close to the top and bottom surfaces of HPT disk, the 2–10 μm‐thick ultrafine‐grained layers with equiaxial grains and grain size of about 150 nm are formed. This grain size is typical for HPT of copper and its alloys. However, the remaining bulk layer in the HPT disk contained mainly elongated intersecting twins with high aspect ratio and length of up to 1 μm. These twin grain boundaries (GBs) are faceted. The geometry of the GB facets is analyzed using Σ3 coincidence site lattice (CSL). The Σ3 twins after HPT contained (100)CSL, (110)CSL, (010)CSL, and non‐CSL 9R facets, but not (120)CSL and (130)CSL facets. Earlier, the stability diagram for the Σ3 GB facets is experimentally constructed for the same 5N5 high‐purity copper. The comparison of the data with this diagram allows to estimate for the first time the effective temperature of pure copper during HPT processing at room temperature (RT): Teff = 920 ± 50 K. In other words, the HPT at RT results in Σ3 GB facets as if the sample is annealed at Teff = 920 ± 50 K.

show abstract

Section: Resultssupporting

confidence: 75%

Faceting of Twin Grain Boundaries in High‐Purity Copper Subjected to High Pressure Torsion

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Generally, dimples were formed perhaps by the dislocation mechanism where during the tensile deformation, dislocation shifted towards the grain boundary and enhanced the dislocation density and resulting in intergranular fracture. 21 Further, a similar observations are observed at the same level of strain rate, in which the quantity and size of the micro-voids and the dimple on the fracture surface increases with the temperature increases. In this situation, however, the differences are not very obvious and significant.…”

Section: Damage Initiation and Progressionsupporting

confidence: 74%

Tensile behaviour and damage characteristic of recycled aluminium alloys AA6061 undergoing finite strain deformation

Nor

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

The effects of temperature and strain rate of hot-forged recycled aluminium alloys AA6061 are examined via uniaxial tensile test implementations in this paper. The tests are conducted at elevated temperatures of 100 °C, 200 °C and 300 °C, at two different strain rates of 10−4 s−1 and 10−3 s−1. The tensile behaviour and damage characteristic are analysed in terms of stress-strain curves and microstructural analysis, respectively. The microstructure and fracture surface of such materials are observed using Scanning Electron Microscope (SEM) and Optical Microscope (OM). The flow stress of recycled AA6061 increases with increasing strain rate and decreases with increasing temperature. ImageJ software is used to quantify void characteristics. It is observed that the quantity and size of the micro-voids are strain-rate sensitive. This is due to the growth and coalescence of the micro-voids. The OM analysis shows the gap between the grain boundaries becomes wider with the increasing temperature that affects the strength of the material. The outcome of this work gives valuable information before the appropriate applications, especially in automotive and aerospace fields, can be established. It can be agreed that there is still a need for improved recycling methods to fulfil the needs in the required applications, as shown by its primary resources. It is a massive challenge and an obvious drawback in such materials due to the degradation of material’s properties related to damage.

show abstract

“…In c) and (e), less amount of dimples is observed and are not densely distributed. Generally, dimples were formed perhaps by the dislocation mechanism where during the tensile deformation, dislocation shifted towards the grain boundary and enhanced the dislocation density and resulting in intergranular fracture [20].…”

Section: Damage Initiation and Progressionmentioning

confidence: 99%

Damage Characteristics of Recycled Aluminium Alloys AA6061 Undergoing Finite Strain Deformation of Tensile Loading

Nor

Lajis

et al. 2022

IJIE

View full text Add to dashboard Cite

Recycling aluminium alloys has excellent advantages to avoid bad environmental effects while providing significant economic benefits. Many efforts are demanded to identify the appropriate applications, especially in automotive and aerospace fields. It can be observed that various recycling methods have been adopted and examined. However, it is generally agreed that there is still a need for improved recycling methods to fulfil the needs of the required applications as shown by its primary resources. It is amassive challenge and an obvious drawback in such materials due to the degradation of material’s properties related to damage, hence, must be critically analyzed before the potential applications can be identified. Based on this motivation, the present study establishes the effects of temperature and strain rate of hot-forged recycled aluminium alloys AA6061 via uniaxial tensile test implementations. The test is conducted at elevated temperatures of 100°C, 200°C and 300°C, at two different strain rates of 10-4 s-1and 10-3s-1. The tensile behaviour and damage are analyzed in terms of stress-strain curves and microstructural analysis, respectively. The microstructure and fracture surface of such materials are observed using Scanning Electron Microscope (SEM) and Optical Microscope (OM).Generally, the flow stress of recycled AA6061 increases with increasing strain rate and decreases with increasing temperature. The quantity and size of the micro-voids observed is enhanced with the increases in strain rate. It is due to the growth and coalescence of the micro-voids. From the OM analysis, the gap between the grain boundaries become wider with the increases in temperature; thus, the strength of the material decreases.

show abstract

Changes of Microstructures and Mechanical Properties in Commercially Pure Titanium after Different Cycles of Proposed Multi-Directional Forging

Cited by 9 publications

References 36 publications

Faceting of Twin Grain Boundaries in High‐Purity Copper Subjected to High Pressure Torsion

Faceting of Twin Grain Boundaries in High‐Purity Copper Subjected to High Pressure Torsion

Tensile behaviour and damage characteristic of recycled aluminium alloys AA6061 undergoing finite strain deformation

Damage Characteristics of Recycled Aluminium Alloys AA6061 Undergoing Finite Strain Deformation of Tensile Loading

Contact Info

Product

Resources

About