Acta Metallurgica Sinica 

About: Acta Metallurgica Sinica is an academic journal. The journal publishes majorly in the area(s): Microstructure & Alloy. Over the lifetime, 4777 publications have been published receiving 14660 citations.

Application of high resolution transmission x-ray tomography in material science

Abstract: The continuing development of X-ray light sources, optical devices and image analy- sis technologies enables us to nondestructively analyze internal structures of materials by using 3D imaging with a spatial resolution of micron, even dozens of nanometers. Innovations in materials sci- ence and technology will benefit from the new achievements of the X-ray tomography with higher resolution. This article devotes to review the origination and development of the X-ray tomography techniques for 3D imaging and introduce the principles and specifications of three imaging methods, including absorption imaging, phase contrast imaging and holographic imaging. The differences be- tween synchrotron-based and laboratory-based X-ray tomography are also discussed. To explore new opportunities of the high resolution X-ray tomography in the development of material science and technology, particular emphasis is laid on the applications for traditional materials with a 3D view, such as the characterizations of holes, cracks, corrosion, composites, and in situ testing etc..

ADVANCES AND CHALLENGES OF TiAl BASE ALLOYS

Abstract: The history of research and development of g-Ti Al intermetallic alloys was outlined and divided into 4 stages: starting(1974~1985), revolutionary(1986~1995), emerging(1996~2005) and specialty materials(2006~). Major events and landmarks at the different stages were recounted to provide a framework for understanding scientific and technological progress. Key advances in the following 6 areas were reviewed: alloying, microstructure type, primary processing(melting), secondary processing(hot working), properties(including creep, fracture and fatigue, and oxidation), and tertiary processing(forming, covering both investment casting and near-net shape powder metallurgy). Future challenges were identified as follows: improvement of centrifugal casting technology, low-cost wrought process, development of third-generation alloys that meet design specifications, new applications based on new technologies, and viability of new forming routes such as additive manufacturing.