Natural and Artificial Aging Effects on the Deformation Behaviors of Al-Mg-Zn Alloy Sheets.

This study investigated the effects of aging profiles on the precipitate formation and the corresponding strengthening and deformation behaviors of Al-Mg-Zn alloys. The alloys subjected to natural aging (NA) demonstrated significantly enhanced ductility at equivalent stress levels compared to those subjected to artificial aging (AA). In AA-treated alloys, η' and η-phases with incoherent interfaces were formed, while GP zones and solute clusters were dominantly exhibited in the NA-treated alloy with a coherent interface with the matrix.

Molecular Dynamics Study on Crack Propagation in Al Containing Mg-Si Clusters Formed during Natural Aging.

The crack propagation behavior of Al containing Mg-Si clusters is investigated using molecular dynamics (MD) simulations to demonstrate the relationship between the natural aging time in Al-Si-Mg alloys and ductility. Experimental results show that the elongation at failure decreases with natural aging. There are few studies on the relationship between natural aging and ductility because of the difficult observation of Mg-Si clusters.

Influence of the Composition and Vacancy Concentration on Cluster Decomposition Behavior in Al-Si-Mg Alloy: A Kinetic Monte Carlo Study.

The influence of cluster composition and the addition of vacancies on the decomposition behavior of clusters during artificial aging in Al-Si-Mg alloys were analyzed according to the kinetic Montel Carlo model. Clusters with a balanced composition (Mg/(Mg + Si) = 0.5) were the most difficult to decompose.

Spinal subdural hematoma after interlaminar full-endoscopic decompression of lumbar spinal stenosis: a case report and literature review.

The use of full-endoscopic decompression for lumbar spinal stenosis has been increasing recently. It is a minimally invasive surgical procedure that has few complications. Spinal subdural hematoma (SSH) following endoscopic surgery has never been reported.

Clinical outcome of paraclinoid internal carotid artery aneurysms after microsurgical neck clipping in comparison with endovascular embolization.

Objective: Because of the complex anatomical association among vascular, dural, and bony structures, paraclinoid internal carotid artery (ICA) aneurysms remain a major challenge for vascular neurosurgeons. We studied the clinical outcomes of 61 paraclinoid ICA aneurysms after microsurgical clipping in comparison with endovascular coiling.

Materials And Methods: Between January 2008 and December 2012, we treated 61 paraclinoid ICA aneurysms created by surgical clipping or endovascular coiling.

The electrochemical properties of lithium/sulfur cell using sulfur-carbon nanotubes composite.

Sulfur electrode was prepared using sulfur-CNT composite powder. The sulfur electrode showed homogenous mixture of sulfur and the CNTs with a network structure. We investigated on the discharge behavior and cycling property of lithium/sulfur cell using sulfur electrodes with CNTs as unique conducting agents.