The fracture strength of cryomilled 99.7 Al nanopowders consolidated by high frequency induction sintering

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

El-Danaf, Ehab A.^1 ; Baig, Muneer^2 ; Almajid, Abdulhakim A.^1 ; Soliman, Mahmoud S.^1

Mechanical Engineering Department, College of Engineering, King Saud University, Riyadh, Saudi Arabia^1

Advanced Manufacturing Institute, King Saud University, Riyadh, Saudi Arabia^2

关键词: Average grain size;    High frequency induction;    Mechanical attrition;    Reference material;    Severe plastic deformations;    Simple compressions;    Sintering parameters;    X-ray line broadening;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012025/pdf
DOI  :  10.1088/1757-899X/63/1/012025

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Mechanical Attrition of metallic powders induces severe plastic deformation and consequently reduces the average grain size. Powders of 99.7 Al (45μm particle size), cryomilled for 7 hrs having a crystal size of ∼ 20 nm, were consolidated by high frequency induction sintering under a constant pressure of 50 MPa and at two temperatures of 500 and 550 °C for two sintering dwell times of 1 and 3 minutes at a constant heating rate of 400 °C/min. The bright field TEM image and X-ray line broadening technique, for the cryomilled powders, were used to measure-The crystallite size. Simple compression at an initial strain rate of 10-4s-1was conducted at room temperature, 373 and 473 K, and the yield strength was documented and correlated with the sintering parameters. The as-received 99.7 Al powders-consolidated using one of the sintering parameters was used as a reference material to compare the mechanical properties. Hardness, density and crystal size of the consolidated sample, that gave the highest yield and fracture strength, were measured.