Investigation of Severe Plastic Deformation Effects on Magnesium RZ5 Alloy Sheets Using a Modified Multi-Pass Equal Channel Angular Pressing (ECAP) Technique

被引:7
|
作者
Sahoo, Partha Sarathi [1 ]
Mahapatra, Manas Mohan [1 ]
Vundavilli, Pandu Ranga [1 ]
Sabat, Rama Krushna [2 ]
Sirohi, Sachin [3 ]
Kumar, Sanjeev [3 ]
机构
[1] Indian Inst Technol Bhubaneswar, Sch Mech Sci, Kansapada 752050, India
[2] Indian Inst Technol Bhubaneswar, Sch Minerals Met & Mat Engn, Kansapada 752050, India
[3] SRM Inst Sci & Technol, Dept Mech Engn, Delhi NCR Campus, Modinagar 201204, India
关键词
Mg-RZ5; ECAP; UFG; channel angle; severe plastic deformation; GRAIN-REFINEMENT; MICROSTRUCTURE; EVOLUTION; RECRYSTALLIZATION; PRINCIPLES; TEXTURE; BEHAVIOR; ROUTES; SHEAR;
D O I
10.3390/ma16145158
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The present study investigates the effects of multiple passes of equal channel angular pressing (ECAP) on magnesium alloy sheets with the assistance of an Inconel plunger along with a die setup having a channel angle of 120 & DEG; and corner angle of 10 & DEG; operating at a temperature of 200 & DEG;C followed by the required heat treatment processes. The microstructural analysis of the sheet samples at various stages of the multi-pass hot ECAP has shown evidence of ultrafine grain refinement (UFG) due to the occurrence of severe plastic deformation. X-ray diffraction analysis has also exhibited the presence of phases like MgZn and CeZn3 which is supposedly responsible for the enhancement of the mechanical properties. As a result, the room temperature tensile and compressive strengths have improved by 6.12% and 6.63%, respectively, after the second pass, and 11.56% and 15.64%, respectively, after the fourth pass of ECAP. Additionally, the hardness of the sheets has increased by 6.49% and 16.64% after the second and fourth pass of hot ECAP, respectively, mainly attributed to the drastic decrease in grain size from 164 & mu;m to 12 & mu;m within four ECAP passes, all these with a negligible change in ductility. This success in the thermomechanical processing of Mg-RZ5 alloy sheets using a die channel angle of 120 & DEG; with a minimal number of passes of hot ECAP under a controlled equivalent strain, further opens doors for incorporating optimizations and/or additional aspects so as to achieve even better grain refinements, and consequently, mechanical strength improvements thereby catering to the industrial needs of aerospace and construction areas.
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页数:20
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