Enhanced resistance to liquation cracking during fusion welding of cast magnesium alloys: Microstructure tailoring via friction stir processing pre-weld treatment

2020 ◽  
Vol 798 ◽  
pp. 140142
Author(s):  
H. Jiryaei Sharahi ◽  
M. Pouranvari ◽  
M. Movahedi
Keyword(s):  
Magnesium Alloys ◽  
Friction Stir Processing ◽  
Fusion Welding ◽  
Liquation Cracking ◽  
Friction Stir ◽  
Enhanced Resistance ◽  
Cast Magnesium Alloys ◽  
Cast Magnesium

scholarly journals Microstructures in Friction-Stir Welded Dissimilar, Semi-Solid-Cast Magnesium Alloys

2003 ◽  
Vol 9 (S02) ◽  
pp. 700-701
Author(s):  
A. C. Somasekharan ◽  
W. C. Davis ◽  
L. E. Murr
Keyword(s):  
Magnesium Alloys ◽  
Friction Stir ◽  
Cast Magnesium Alloys ◽  
Semi Solid ◽  
Cast Magnesium

Microstructure and Properties of Friction Stir Butt-Welded Magnesium Casting Alloys

2011 ◽  
Vol 56 (3) ◽  
pp. 749-758 ◽  
Author(s):  
D. Miara ◽  
A. Pietras ◽  
K. Mroczka
Keyword(s):  
Magnesium Alloys ◽  
Friction Stir ◽  
Microstructure And Properties ◽  
Casting Alloys ◽  
Torque Measurements ◽  
Magnesium Casting ◽  
Weld Structure ◽  
Vertical Milling Machine ◽  
Cast Magnesium Alloys ◽  
Cast Magnesium

Microstructure and Properties of Friction Stir Butt-Welded Magnesium Casting AlloysThe article presents results of testing the quality of FSW welded joints made in plates of various magnesium casting alloys, including MCMgAl9Zn1 (AZ91), MCMgRe3Zn2Zr (ZRE1), MCMgRe2Ag2Zr (MSR-B) and MCMgY4Re3Zr (WE43). In this paper, all results for magnesium casting alloy AZ91 are presented, whereas for other alloys (ZRE1, MSR-B and WE43) only selected testing results for best parameters have been chosen and shown. Butt joints were produced on the friction welding machine built on the base of the conventional vertical milling machine. Quality assessment included the visual inspection, temperature measurements in welding region, tensile strength testing, analysis of the weld structure, hardness, weld force and torque measurements. Research aimed at the recognition of the FSW abilities to weld cast magnesium alloys, the influence of the welding conditions on the welds' properties as well as their structures. The research results have revealed that cast magnesium alloys are weldable using FSW process - it is possible to produce joints of very good quality in relatively narrow range of parameters and the strength of the joints is satisfactory. In order to acquire joints of the best quality it is recommended that workpieces should be rigidly clamped and the welding speed should be limited. The best mechanical properties have been obtained for friction with rotation speed of 355 rpm.

Enhanced mechanical properties of as-cast Mg-Al-Ca magnesium alloys by friction stir processing

2021 ◽  
Vol 296 ◽  
pp. 129880
Author(s):  
Zahra Nasiri ◽  
Mahmoud Sarkari Khorrami ◽  
Hamed Mirzadeh ◽  
Massoud Emamy
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloys ◽  
Friction Stir Processing ◽  
Friction Stir

Long Term Creep Properties of a Die-Cast Mg-Al-Ca Alloy

2007 ◽  
Vol 561-565 ◽  
pp. 163-166
Author(s):  
Yoshihiro Terada ◽  
Tatsuo Sato
Keyword(s):  
Creep Rate ◽  
Magnesium Alloys ◽  
Cast Alloy ◽  
Rupture Life ◽  
Testing Temperature ◽  
Creep Rupture ◽  
Die Cast ◽  
Cast Magnesium Alloys ◽  
Term Creep ◽  
Cast Magnesium

Creep rupture tests were performed for a die-cast Mg-Al-Ca alloy AX52 (X representing calcium) at 29 kinds of creep conditions in the temperature range between 423 and 498 K. The creep curve for the alloy is characterized by a minimum in the creep rate followed by an accelerating stage. The minimum creep rate (ε& m) and the creep rupture life (trup) follow the phenomenological Monkman-Grant relationship; trup = C0 /ε& m m. It is found for the AX52 die-cast alloy that the exponent m is unity and the constant C0 is 2.0 x 10-2, independent of creep testing temperature. The values of m and C0 are compared with those for another die-cast magnesium alloys. The value m=1 is generally detected for die-cast magnesium alloys. On the contrary, the value of C0 sensitively depends on alloy composition, which is reduced with increasing the concentration of alloying elements such as Al, Zn and Ca.

scholarly journals Influence of Multi-Holes on Fatigue Behaviors of Cast Magnesium Alloys Based on In-Situ Scanning Electron Microscope Technology

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1700 ◽  
Author(s):  
Xi-Shu Wang ◽  
Chang-Hao Tan ◽  
Juan Ma ◽  
Xiao-Dong Zhu ◽  
Qing-Yuan Wang
Keyword(s):  
Fatigue Crack ◽  
Electron Microscope ◽  
Crack Initiation ◽  
Scanning Electron Microscope ◽  
Magnesium Alloys ◽  
Mg17al12 Phase ◽  
Cast Magnesium Alloys ◽  
Cast Magnesium ◽  
Scanning Electron

The low cycle fatigue tests on the crack initiation and propagation of cast magnesium alloys with two small holes were carried out by using in-situ scanning electron microscope (SEM) observation technology. The fatigue crack propagation behaviors and fatigue life, which are affected by two small artificial through holes, including the distances between two holes and their locations, were discussed in detail based on the experimental results and the finite element analysis (FEA). The results indicated that the fatigue multi-cracks occurred chiefly at the edges of two holes and the main crack propagation was along the weak dendrite boundary with the plastic deformation vestiges on the surface of α-Mg phase of cast AM50 and AM60B alloys. The fatigue cracking characteristics of cast AZ91 alloy depended mainly on the brittle properties of β-Mg17Al12 phase, in which the multi-cracks occurred still at the edges of two holes and boundaries of β-Mg17Al12 phase. The fatigue crack initiation position of cast magnesium alloys depends strongly on the radius of curvature of through hole or stress concentration factor at the closed edges of two through holes. In addition, the fatigue multi-cracks were amalgamated for the samples with titled 45° of two small holes of cast Mg-Al alloys when the hole distance is less than 4D (D is the diameter of the small hole).

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