An investigation of normal and submerged condition on microstructural and tribological properties of friction stir processed AZ91-D magnesium alloy

被引：17
作者：
Bhadouria, N. [1 ]
Thakur, L. [1 ]
Kumar, P. [1 ]
Arora, N. [2 ]
机构：
[1] Natl Inst Technol Kurukshetra, Dept Mech Engn, Thanesar 136119, Haryana, India
[2] Indian Inst Technol Roorkee, Dept Mech & Ind Engn, Roorkee 247667, Uttarakhand, India
来源：
CANADIAN METALLURGICAL QUARTERLY | 2017年 / 56卷 / 01期
关键词：
Magnesium alloys; Submerged friction stir processing; Dynamic recrystallisation; Micro-hardness; Pin-on-disc; Sliding wear; SLIDING WEAR BEHAVIOR; AL-ZN ALLOY; AZ31; MAGNESIUM; DYNAMIC RECRYSTALLIZATION; MECHANICAL-PROPERTIES; GRAIN-REFINEMENT; THERMAL HISTORY; ALUMINUM; STRENGTH;
D O I：
10.1080/00084433.2016.1270394
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
A comparative study of micro-structural transformations and tribological properties of the friction stir processed AZ91-D magnesium (Mg) alloy in normal friction stir processing (NFSP) and submerged friction stir processing (SFSP) conditions was carried out. The optimum parameters used for processing were tool rotational speed of 1000 rpm/min, 50 mm/min of transverse speed and 6 numbers of passes. A significant reduction in grain size (28.7% and 13.1%) and increase in micro-hardness (14.55% and 8.92%) along depth and width of stir zone (SZ) of SFSPed specimen has been achieved as compared to NFSPed specimens. This change can be attributed to the dynamic recrystallisation and removal of excess frictional heat leading to inhibited post-grain growth in the processed alloy. Pin-on-disc sliding wear testing was conducted to compare the wear performance of NFSPed and SFSPed specimens. The SFSPed specimen has shown an improved wear resistance as compared to NFSPed specimens. The major prevailing wear mechanisms were abrasion, delamination, oxidation and mild plastic deformation.
引用
收藏
页码：94 / 103
页数：10
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