Effects of θ′ precipitates on the mechanical performance and fracture behavior of an Al–Cu alloy subjected to overaged condition

2019 ◽  
Vol 762 ◽  
pp. 138091 ◽  
Author(s):  
Lin Gao ◽  
Xiaoqin Ou ◽  
Song Ni ◽  
Kai Li ◽  
Yong Du ◽  
...  
Keyword(s):  
Fracture Behavior ◽  
Mechanical Performance ◽  
Overaged Condition ◽  
Cu Alloy

scholarly journals Accelerated discovery of high-strength aluminum alloys by machine learning

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Jiaheng Li ◽  
Yingbo Zhang ◽  
Xinyu Cao ◽  
Qi Zeng ◽  
Ye Zhuang ◽  
...  
Keyword(s):  
Machine Learning ◽  
Aluminum Alloys ◽  
Mechanical Performance ◽  
High Strength ◽  
Cost Effective ◽  
Alloy System ◽  
Processing Route ◽  
Specific Strength ◽  
Cu Alloy ◽  
High Strength Aluminum Alloys

Abstract Aluminum alloys are attractive for a number of applications due to their high specific strength, and developing new compositions is a major goal in the structural materials community. Here, we investigate the Al-Zn-Mg-Cu alloy system (7xxx series) by machine learning-based composition and process optimization. The discovered optimized alloy is compositionally lean with a high ultimate tensile strength of 952 MPa and 6.3% elongation following a cost-effective processing route. We find that the Al8Cu4Y phase in wrought 7xxx-T6 alloys exists in the form of a nanoscale network structure along sub-grain boundaries besides the common irregular-shaped particles. Our study demonstrates the feasibility of using machine learning to search for 7xxx alloys with good mechanical performance.

FRACTURE BEHAVIOR OF Zr-BASED BULK METALLIC GLASS UNDER IMPACT LOADING

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4359-4364 ◽  
Author(s):  
HYUNG-SEOP SHIN ◽  
KI-HYUN KIM ◽  
SANG-YEOB OH
Keyword(s):  
Fracture Toughness ◽  
Crack Initiation ◽  
Fracture Energy ◽  
Impact Loading ◽  
Static Loading ◽  
Fracture Behavior ◽  
Loading Rate ◽  
Shear Bands ◽  
Maximum Load ◽  
Cu Alloy

The fracture behavior of a Zr -based bulk amorphous metal under impact loading using subsize V-shaped Charpy specimens was investigated. Influences of loading rate on the fracture behavior of amorphous Zr - Al - Ni - Cu alloy were examined. As a result, the maximum load and absorbed fracture energy under impact loading were lower than those under quasi-static loading. A large part of the absorbed fracture energy in the Zr -based BMG was consumed in the process for crack initiation and not for crack propagation. In addition, fractographic characteristics of BMGs, especially the initiation and development of shear bands at the notch tip were investigated. Fractured surfaces under impact loading are smoother than those under quasi-static loading. The absorbed fracture energy appeared differently depending on the appearance of the shear bands developed. It can be found that the fracture energy and fracture toughness of Zr -based BMG are closely related with the extent of shear bands developed during fracture.

Mechanical Performance and Fracture Behavior of Recycled AA6061-T6 Alloy Melted from Aluminium Chips

2017 ◽  
Vol 7 (1) ◽  
pp. 1-17
Author(s):  
Naveed Akhtar ◽  
Razzaq Ahmed ◽  
Muhammad Arfan ◽  
Muhammad Noshad Ali
Keyword(s):  
Mechanical Properties ◽  
Intermetallic Compounds ◽  
Fracture Behavior ◽  
Mechanical Performance ◽  
Sem Analysis ◽  
Reverberatory Furnace ◽  
Molten Bath ◽  
Furnace Charge ◽  
Mixed Nature

Aluminium chips were re-melted under the molten bath in a gas fired reverberatory furnace and superior quality recycled AA6061-T6 alloy was synthesized. The chips were added 5 to 20% by weight in the recycled alloy. The furnace charge included clean scrap of the same alloy (AA6061) along with the machining chips or tunings of mixed nature. The chips used in this study were mostly generated from lath/bore operations carried on homogenized billets. The fabricated alloy of each heat was characterized for microstructures, mechanical properties and fracture behavior. The results showed that the metallurgical and mechanical performance of the recycled alloy was comparable to the primary alloy. However, SEM analysis of the recycled alloy revealed a sizeable amount of Fe and Si containing intermetallic compounds such as AlFeSi, AlFeMg, and AlSiMg phases.

Influence of cryogenic treatment on mechanical performance of friction stir Al-Zn-Cu alloy weldments

2020 ◽  
Vol 56 ◽  
pp. 43-53
Author(s):  
Anuj Bansal ◽  
Anil Kumar Singla ◽  
Vinay Dwivedi ◽  
Deepak Kumar Goyal ◽  
Jonny Singla ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Cryogenic Treatment ◽  
Friction Stir ◽  
Cu Alloy

Influence of Zr on the Microstructure and Mechanical Properties of an Al-Zn-Mg-Cu Alloy

2007 ◽  
Vol 546-549 ◽  
pp. 1069-1076 ◽  
Author(s):  
Shou Jie Yang ◽  
You Hua Xie ◽  
Sheng Long Dai ◽  
Ming Gao Yan
Keyword(s):  
Mechanical Properties ◽  
Fracture Mechanism ◽  
Mass Fraction ◽  
Fracture Behavior ◽  
High Strength ◽  
Age Hardening ◽  
Cu Alloy ◽  
Microstructure And Mechanical Properties ◽  
Peak Value

Recently, a new super-high-strength Al-Zn-Mg-Cu alloy with Zr bearing was developed in BIAM. In this paper, the effect of microalloying element Zr on the microstructure and mechanical properties of the alloy was investigated. It was found that the influence of Zr on the microstructure and age-hardening behaviors was remarkable. The strength of the alloy increases with increasing the content of zirconium, and the peak value of the elongation appeared when the content of Zr was 0.06%(mass fraction) and then decreases. The fracture behavior was also studied. The result shows that the fracture mechanism of the alloy was converted from intergranular brittle to transgranular ductile model with increasing the content of zirconium. Finally, the optimum contents of Zr in the alloy were proposed as 0.10%~0.14%.

scholarly journals Effect of Different Tool Probe Profiles on Material Flow of Al–Mg–Cu Alloy Joined by Friction Stir Welding

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6296
Author(s):  
Anton Naumov ◽  
Evgenii Rylkov ◽  
Pavel Polyakov ◽  
Fedor Isupov ◽  
Andrey Rudskoy ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Welding ◽  
Dynamic Viscosity ◽  
Material Flow ◽  
Mechanical Performance ◽  
Strain Rates ◽  
Friction Stir ◽  
Cu Alloy ◽  
First Case ◽  
Positive Effect

Friction Stir Welding (FSW) was utilized to butt−join 2024–T4 aluminum alloy plates of 1.9 mm thickness, using tools with conical and tapered hexagonal probe profiles. The characteristic effects of FSW using tools with tapered hexagonal probe profiles include an increase in the heat input and a significant modification of material flow, which have a positive effect on the metallurgical characteristics and mechanical performance of the weld. The differences in mechanical properties were interpreted through macrostructural changes and mechanical properties of the welded joints, which were supported by numerical simulation results on temperature distribution and material flow. The material flow resulting from the tapered hexagonal probe was more complicated than that of the conical probe. If in the first case, the dynamic viscosity and strain rate are homogeneously distributed around the probe, but in the case of the tapered hexagonal probe tool, the zones with maximum values of strain rates and minimum values of dynamic viscosity are located along the six tapered edges of the probe.

Development of In Situ Techniques for Torsion and Tension Testing in Hydrogen Environment

2011 ◽  
Author(s):  
John Jy-An Wang ◽  
Fei Ren ◽  
Wei Zhang ◽  
Zhili Feng ◽  
Lawrence Anovitz ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Fracture Behavior ◽  
Structural Integrity ◽  
Mechanical Performance ◽  
High Strength Steels ◽  
Structural Materials ◽  
Fracture Testing ◽  
Hydrogen Environment ◽  
In Situ Techniques

Reliability of hydrogen pipelines and storage tanks is significantly influenced by the mechanical performance of the structural materials exposed to the hydrogen environment. Fracture behavior and fracture toughness are of specific interest since they are relevant to structural integrity. However, many conventional fracture testing techniques are difficult to be realized under the presence of hydrogen. Thus it is desired to develop novel in situ techniques to study the fracture behavior of structural materials in hydrogen environments. In this study, two special testing apparatus were designed to facilitate in situ fracture testing in H2. In addition to a multi-notch tensile fixture, a torsional fixture was developed to utilize an emerging fracture testing technique, Spiral Notch Torsion Test (SNTT). The design concepts will be discussed. Preliminary in situ testing results indicated that the exposure to H2 significantly reduces the fracture toughness of 4340 high strength steels by up to 50 percent. Furthermore, SNTT tests conducted in air demonstrated a significant fracture toughness reduction in samples subject to simulated welding heat treatment using a Gleeble machine, which illustrated the effect of welding on the fracture toughness of this material.

scholarly journals New material perspective for endocrown restorations: effects on mechanical performance and fracture behavior

2019 ◽  
Vol 33 ◽  
Author(s):  
José Augusto SEDREZ-PORTO ◽  
Eliseu Aldrighi MÜNCHOW ◽  
Lisia Lorea VALENTE ◽  
Maximiliano Sergio CENCI ◽  
Tatiana PEREIRA-CENCI
Keyword(s):  
Fracture Behavior ◽  
Mechanical Performance ◽  
New Material

Effect of Ag on the Sn-Cu Lead-Free Material

2014 ◽  
Vol 687-691 ◽  
pp. 4291-4294
Author(s):  
Zhi Gang Kong ◽  
Feng Min Shi
Keyword(s):  
Mechanical Performance ◽  
Environmentally Benign ◽  
Lead Free ◽  
Electronic Packages ◽  
Cu Alloy ◽  
Wetting Property ◽  
Analytical Research ◽  
Free Solder ◽  
Free Material ◽  
Better Than

With the increasing focus on developing environmentally benign electronic packages, Pb-free alloys have received a great deal of attention. Among the lead-free solder materials, Sn–Ag–Cu alloy has advantages of good wetting property, superior interfacial properties, high creep resistance and low coarsening rate. In this article, the organization and mechanical performance of Sn-Ag-Cu Material are investigated. Series of inspections and analytical research methods are introduced. Experimental results show that Sn-Cu solder organization contains a large number of Cu6Sn5graphic, while Sn-Ag-Cu graphic is IMC Ag3Sn graphic. The mechanical propersity of Sn-Ag-Cu alloy is better than the Sn-Cu alloy. Fracture surfaces of the Sn-Ag3.0-Cu0.5 alloys specimen have many small size and homogeneously distributed dimples.

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