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The effect of equal channel angular pressing process on aluminium alloy studied using simulation and experimental / Muhammad Abdul Hisyam Abu Hassan

By:

Muhammad Abdul Hisyam Abu Hassan [author.]

Material type: Text

text
text

Media type:

unmediated
computer

Carrier type:

volume
computer disc

ISBN:

THE0009138(Local)

Subject(s):

Dissertation note: Thesis (Master of Science) -- Universiti Malaysia Pahang – 2020 Abstract: Equal Channel Angular Pressing (ECAP) process is one of the metals forming processes that involve severe plastic deformation obtained from the strain. This research is to study the strain behavior of ECAP process on the Aluminum Alloy 6061 (AA 6061) sample by simulation analysis and experimental analysis. The main objective for this research is to analyze the effect of angular channel of ECAP die which are 120° and 126° to the behavior of the AA 6061 sample during the pressing process. The analyzation is done on eight passes of Abaqus simulation and one pass of experimental conduct which will be compared to both die channel and between experimental and simulation. The microstructure and hardness test are done on the ECAP-ed sample from experimental for further analyzation. The simulation result showed that the equivalent plastic strain is decreasing rapidly from the first pass until the fourth pass for ECAP-ed sample of 120° but maintained its value from fifth to eighth pass where the sample strength has increased; it prevented the sample to pass through the channel outlet. ECAP-ed sample from 126° however showed slow and smooth decrease of equivalent plastic strain and can pass through the channel outlet throughout the pressing process. The strain showed that it moved from the outside sample and toward the middle sample during the pressing process. The final equivalent plastic strain recorded for 120° die is 1.27% while the strain recorded for 126° is 0.99%. Experimental analysis showed that ECAP-ed sample from 126° die channel can pass through more of its section compared to 120° ECAP-ed sample. Microstructural analysis showed that ECAP-ed sample grain size has been elongated, decreased in sizes as and increased in number of precipitates even for a single pass which 120° ECAP-ed sample has more refined microstructure compared to 126° ECAP-ed sample. The Vickers Hardness analysis showed that the Vickers Hardness for 120° ECAP-ed sample showed an increase of 43.64% while for 126° ECAP-ed sample has an increase of hardness of 40.14%. The result from the simulation of the first pass validated the experimental analysis. In conclusion, ECAP process does increase the quality of the sample in terms of hardness and microstructure refinement and 126° die has more homogenous strain value and easier to press compared to 120° die by increasing the number of ECAP pass.

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Holdings ( 2 )
Title notes ( 4 )

Holdings
Item type	Current library	Collection	Call number	Copy number	Status	Date due	Barcode
Restricted Collection	UMPLIB PEKAN Reference	Reference	CD12847 (Browse shelf(Opens below))	1	Not for loan (Restricted access)		T000001362
Thesis	UMPLIB PEKAN Reference	Reference	FTKMA .H57 2020 r Thesis (Browse shelf(Opens below))	1	Not for loan (Restricted access)		T000001361

Faculty of Mechanical and Automotive Engineering Technology

Thesis (Master of Science) -- Universiti Malaysia Pahang – 2020

Includes bibliographical references

Equal Channel Angular Pressing (ECAP) process is one of the metals forming processes that involve severe plastic deformation obtained from the strain. This research is to study the strain behavior of ECAP process on the Aluminum Alloy 6061 (AA 6061) sample by simulation analysis and experimental analysis. The main objective for this research is to analyze the effect of angular channel of ECAP die which are 120° and 126° to the behavior of the AA 6061 sample during the pressing process. The analyzation is done on eight passes of Abaqus simulation and one pass of experimental conduct which will be compared to both die channel and between experimental and simulation. The microstructure and hardness test are done on the ECAP-ed sample from experimental for further analyzation. The simulation result showed that the equivalent plastic strain is decreasing rapidly from the first pass until the fourth pass for ECAP-ed sample of 120° but maintained its value from fifth to eighth pass where the sample strength has increased; it prevented the sample to pass through the channel outlet. ECAP-ed sample from 126° however showed slow and smooth decrease of equivalent plastic strain and can pass through the channel outlet throughout the pressing process. The strain showed that it moved from the outside sample and toward the middle sample during the pressing process. The final equivalent plastic strain recorded for 120° die is 1.27% while the strain recorded for 126° is 0.99%. Experimental analysis showed that ECAP-ed sample from 126° die channel can pass through more of its section compared to 120° ECAP-ed sample. Microstructural analysis showed that ECAP-ed sample grain size has been elongated, decreased in sizes as and increased in number of precipitates even for a single pass which 120° ECAP-ed sample has more refined microstructure compared to 126° ECAP-ed sample. The Vickers Hardness analysis showed that the Vickers Hardness for 120° ECAP-ed sample showed an increase of 43.64% while for 126° ECAP-ed sample has an increase of hardness of 40.14%. The result from the simulation of the first pass validated the experimental analysis. In conclusion, ECAP process does increase the quality of the sample in terms of hardness and microstructure refinement and 126° die has more homogenous strain value and easier to press compared to 120° die by increasing the number of ECAP pass.