Mechanical property evaluation of an Al-2024 alloy subjected to HPT processing

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Patil, Deepak C.^1 ; Venkateswarlu, K.^2 ; Kori, S.A.^3 ; Das, Goutam^4 ; Das, Mousumi^4 ; Alhajeri, Saleh N.^5 ; Langdon, Terence G.^6

KLE Dr. M. S. Sheshgiri College of Engineering and Technology, Udyambag, Belgaum-590008, India^1

CSIR-National Aerospace Laboratories, Bangalore-560017, Karnataka, India^2

Basaveshwar Engineering College, Bagalkot-587102, Karnataka, India^3

CSIR-National Metallurgical Laboratory, Jamshedpur-831007, India^4

Department of Manufacturing Engineering, College of Technological Studies, PAAET, 70654 Shuwaikh, Kuwait^5

Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, SO17 1BJ, Southampton, United Kingdom^6

关键词: Average grain size;    Ball indentation technique;    Dislocation densities;    High angle grain boundaries;    High pressure torsions;    Loading and unloading;    Mechanical property evaluation;    Spherical indenters;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012085/pdf
DOI  :  10.1088/1757-899X/63/1/012085

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

An aluminum-copper alloy (Al-2024) was successfully subjected to high-pressure torsion (HPT) up to five turns at room temperature under an applied pressure of 6.0 GPa. The Al-2024 alloy is used as a fuselage structural material in the aerospace sector. Mechanical properties of the HPT-processed Al-2024 alloy were evaluated using the automated ball indentation technique. This test is based on multiple cycles of loading and unloading where a spherical indenter is used. After two and five turns of HPT, the Al-2024 alloy exhibited a UTS value of ∼1014 MPa and ∼1160 MPa respectively, at the edge of the samples. The microhardness was measured from edges to centers for all HPT samples. These results clearly demonstrate that processing by HPT gives a very significant increase in tensile properties and the microhardness values increase symmetrically from the centers to the edges. Following HPT, TEM examination of the five-turn HPT sample revealed the formation of high-angle grain boundaries and a large dislocation density with a reduced average grain size of ∼80 nm. These results also demonstrate that high-pressure torsion is a processing tool for developing nanostructures in the Al-2024 alloy with enhanced mechanical properties.