Paper Title :Microstructure Evolution and Mechanical Properties of Al-1.94mn-0.5cu Alloy Produced by Directional Solidification
Author :Ugur Buyuk, Hasan Kaya, Emin Cadirli
Article Citation :Ugur Buyuk ,Hasan Kaya ,Emin Cadirli ,
(2017 ) " Microstructure Evolution and Mechanical Properties of Al-1.94mn-0.5cu Alloy Produced by Directional Solidification " ,
International Journal of Mechanical and Production Engineering (IJMPE) ,
pp. 22-25,
Volume-5,Issue-9
Abstract : In this investigation, Al-1.94Mn-0.5Cu (wt.%) alloy was directionally solidified at different solidification rates
varying from 8.3 to 978 m/s at a constant temperature gradient (7.1 K/mm). The microstructure was analyzed by optical
microscopy and scanning electronic microscopy. Especially, cell-dendritic transition was detected for low solidification rate
(8.3 m/s). Then with increasing solidification rate, the microstructure is completely converted to a dendritic form. The
microhardness increased from 470 to 520 MPa and the tensile strength increased from 109 to 145 MPa with increasing the
solidification rate from 8.3 to 978 m/s. Exponent values of the V for the microhardness and tensile strength were calculated
as 0.04 and 0.06, respectively. Fracture surface images of the studied alloys were analyzed depending on solidification rate.
These fracture surfaces exhibited a lot of small dimples, a characteristic of ductile fracture. Many micro-cracks start from
these voids and dimples. The mode of fracture significantly changed from ductile to less ductile with the increase of the
solidification rate.
Index Terms- Directionally solidification, microstructure, microhardness, tensile strength, fracture
Type : Research paper
Published : Volume-5,Issue-9
DOIONLINE NO - IJMPE-IRAJ-DOIONLINE-9289
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Published on 2017-11-23 |
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