Study of the Origins of Toughness in Amorphous Metals
نویسندگان
چکیده
Owing to a lack of microstructure, glassy materials are inherently strong but brittle, and often demonstrate extreme sensitivity to flaws. Accordingly, their macroscopic failure is often not initiated by plastic yielding, and almost always terminated by brittle fracture. Unlike conventional brittle glasses, metallic glasses are generally capable of limited plastic yielding by shear-band sliding in the vicinity of a flaw, and thus exhibit toughness–strength relationships that lie between brittle ceramics and marginally tough metals. Here, a bulk glassy Pd-alloy is introduced demonstrating an unusual capacity for shielding an opening crack accommodated by an extensive shear-band sliding process, which promotes a fracture toughness comparable to the toughest materials known. This result demonstrates that the combination of toughness and strength (i.e., damage tolerance) accessible to amorphous materials extends beyond the benchmark ranges established by the toughest and strongest materials known, thereby pushing the envelope of damage tolerance accessible to
منابع مشابه
Evaluation of microstructure and mechanical properties of bulk nanostructured Ti5Si3 and Ti5Si3-Al2O3 nanocomposite
Mechanical alloying and vacuum sintering have been used to produce bulk nanostructured Ti5Si3 and Ti5Si3-15Wt.% Al2O3 nanocomposite. X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) were used to study the microstructural characteristics of the samples. Indentation method was used to calculate hardness, elastic modulus and fracture toughness ...
متن کاملبررسی عوامل موثر بر سختی و چقرمگی شکست هاردمتالهای کاربیدتنگستن-کبالت
Mechanical properties of hard metals are very close to starting material, carbide grain size, kind of binders and sintering temperatures. In this research, effect of the amount of binder phase, starting powder and sintering situation on the mechanical properties of hardness and fracture toughness of Tungsten carbide-Cobalt hard metals were investigated. The results showed that the powder granul...
متن کاملImprovement of Impact Toughness of API-X70 Steel Weld metals With Electromagnetic Vibration
متن کامل
Improvement of Impact Toughness of API-X70 Steel Weld metals With Electromagnetic Vibration
متن کامل
Anthropogenicimpacts on heavy metals (Pb, Ni, Zn and Fe) concentration in surface sediments of Shoor River Estuary, Bandar Abbas
Toxicity of trace metals in the environment, bioaccumulation in aquatic environments and in food chains are of great importance.This study concentrates on the distribution patterns of some heavy metals (Pb, Ni, Zn and Fe) in surface sediments of Shoor River estuary to obtain an overall classification for the origins of the metals in the studied area. In order to determine the degree of Contamin...
متن کامل