GVSU EGR 250 - EGR250 Methods of Determining Grain Size (10 pages)

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EGR250 Methods of Determining Grain Size



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EGR250 Methods of Determining Grain Size

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Pages:
10
School:
Grand Valley State University
Course:
Egr 250 - Materials Science and Engineering

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1 Abstract Ten photomicrographs were taken of AA5182 aluminum with solidification rates ranging between 0 1 K s and 14 1 K s at 50X magnification The objective was to determine the effects of solidification rate on the grain size and yield strength of the aluminum Grain size calculations were performed on each photomicrograph using both the ASTM comparative chart method and the linear intercept method The resultant grain diameters were found to range from 100 m to 300 m and the size was inversely proportional to the solidification rate The yield strength of the aluminum was found using the Hall Petch equation which ranged from 75MPa to 86MPa It was determined that increasing the solidification rate increases the effective yield strength of the aluminum Introduction The properties of engineering materials depend heavily on the processes that are used to fabricate them Therefore materials can be manipulated to obtain desirable properties if one understands the relationship between the process and the resultant microstructure of the material In this case the relationship between grain size and yield strength was studied Ten samples of AA5128 aluminum were formed using a range of solidification rates to exemplify the effect of solidification rate on yield strength Photomicrographs were taken of each materials grain structure and the ASTM comparative chart method and the linear intercept method were used to determine the grain size of each material The Hall Petch equation was then used to determine the relationship between grain size and yield strength of the aluminum Experimental Procedure Ten photomicrographs were taken of AA5182 aluminum with different solidification rates at 50X magnification Aluminum AA5182 consists of 4 5 wt Mg 0 35 wt Fe 0 25 wt Zn 0 2 0 5 wt Mn 0 2 wt Si and the balance is Al The number of grains along the edge of each photomicrograph and the number of interior grains were counted separately Since the grains on the edge represent approximately



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