Title of article :
Supportive strengthening role of Cr-rich phase on Al–Si multicomponent piston alloy at elevated temperature
Author/Authors :
Li، نويسنده , , Yunguo and Yang، نويسنده , , Yang and Wu، نويسنده , , Yuying and Wei، نويسنده , , Zuoshan and Liu، نويسنده , , Xiangfa، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Pages :
4
From page :
4427
To page :
4430
Abstract :
The microstructure and elevated-temperature strength of an Al–Si piston alloy with 0.5 wt.% Cr and 0.8 wt.% Fe addition were investigated in this paper. The addition of Cr and Fe leads to the formation of α-Al(Fe,Cr)Si phase, which maintains the crystal structure of α-Al(Fe,Mn,Cr)Si phase but has different stoichiometry and morphology from the phase in previous works. Besides, the morphology of δ-Al3CuNi phase changes because of solid-solved Cr. These changes result in the formation of closed and semi-closed network eutectic colonies. The Cr-rich phases, acting as effective supportive strengthening phase, integrate organically with Ni-rich phases, acting as main strengthening phases. So α-Al phases are successfully encircled by eutectic intermetallic phases, and the slide of α-Al under stress at elevated temperature can be effectively hindered. Thus the ultimate tensile strength of the examined alloy is increased by 26% after 0.5 wt.% Cr and 0.8 wt.% Fe addition.
Keywords :
Casting , Multicomponent alloys , mechanical properties , microstructure
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Serial Year :
2011
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Record number :
2164087
Link To Document :
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