Abstract
This paper reports the development of novel Sinter-Aluminum-Pulver (SAP)-like Al–AlN nanocomposites via replacing the native Al2O3 thin films on fine Al powder with a large volume fraction of in situ formed nanometric AlN dispersoids. Fine gas-atomized Al powder (d50=1.3µm) compacts were first partially nitrided at 590°C in flowing nitrogen, controlled by a small addition of Sn (0.3–0.4wt%), and subsequently consolidated by hot direct extrusion. The resulting Al–AlN composites consisted of submicrometric Al grains reinforced with nanometric AlN dispersoids together with some nanometric Al2O3 dispersoids. An Al–13vol% AlN nanocomposite fabricated this way achieved exceptional ultimate tensile strength of 227MPa, yield strength of 195MPa and Young's modulus of 66GPa at 300°C, superior to typical SAP materials and coarse grained Al–AlN composites. In addition, the Al–13vol% AlN nanocomposite exhibited good thermal stability up to 500°C. The strengthening mechanism is discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
