Texture and weak grain size dependence in friction stir processed Mg–Al–Zn alloy

Wang, Y.N.; Chang, Chuntao; Lee, C.J.; Lin, Hao-Hsiung; Huang, J.C.

doi:10.1016/j.scriptamat.2006.06.005

Cited by 190 publications

(77 citation statements)

References 20 publications

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“…These XRD results show that one-pass and multi-passes FSP have the similar texture and are consistent with the previous texture research on the FSP Mg alloys. [17][18][19] It is confirmed that the specific FSP texture in the stirred zone, where the (0002) basal planes tend to lie surrounding the stirring pin, is persistently maintained even with increasing FSP pass number.…”

Section: Xrd Resultsmentioning

confidence: 71%

Using Multiple FSP Passes to Cure Onion Splitting of Mg Alloys Deformed at Elevated Temperatures

Lee

Huang

2007

Mater. Trans.

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The investigation of high temperature mechanical properties of the friction stir processed AZ61 alloy with different passes shows that the one-pass processed AZ61 Mg alloy exhibits inferior superplastic deformation ability along the FSP forward traveling direction due to the onionring pre-mature splitting. The homogenous microstructure in the multi-pass friction stir processed Mg alloy can avoid the onion-ring splitting and eliminate the anisotropy behavior of high temperature mechanical properties.

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Section: Xrd Resultsmentioning

confidence: 71%

Using Multiple FSP Passes to Cure Onion Splitting of Mg Alloys Deformed at Elevated Temperatures

Lee

Huang

2007

Mater. Trans.

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“…It is well known that microcracks develop along (0002) crystal planes for Mg alloys. For the FSP Mg alloys, the (0002) plane is roughly distributed along the tool rotation direction, [4] which corresponds with the b-Mg 17 Al 12 bands. Thus, the crack propagated easily from the intermetallic bands into the Mg grains, leading to low ductility.…”

Section: Hardness and Tensile Propertiesmentioning

confidence: 99%

“…The correlation between the grain size and mechanical properties of the magnesium alloys based on the Hall-Petch relation has been well documented. [3,4] Generally, commercial cast magnesium alloys fall into two classes: the Mg-Al-Zn (AZ) and Mg-Al-Mn (AM) systems, developed for room-temperature strength and ductility; and the Mg-Al-RE (AE) and Mg-Al-Si (AS) systems, developed for improved elevated-temperature performance. [5] For the AZ magnesium alloys, no reliable grain refining additive exists due to the interaction between impurity elements (such as zirconium) and aluminum, thereby resulting in poor grain refinement.…”

Section: Introductionmentioning

confidence: 99%

“…[16,17] Recently, research into FSP magnesium-based alloys has demonstrated that effective microstructural homogenization and refinement can be achieved as a result of severe plastic deformation and dynamic recrystallization. [3,4,[18][19][20][21][22][23][24] Our previous work has indicated that two-pass FSP combined with subsequent aging is a simple and effective approach to enhance the mechanical properties of AZ91D casting. [18] Furthermore, a preliminary comparative study indicated that single-pass FSP on AZ91D casting produced a heterogonous microstructure with low strength and ductility; however, a pre-solution treatment (pre-ST) prior to FSP resulted in improved microstructural uniformity and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Friction Stir Processing Procedures on Microstructure and Mechanical Properties of Mg-Al-Zn Casting

Feng

Xiao²,

Y.³

et al. 2009

Metall Mater Trans A

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Cast Mg-Al-Zn (AZ80) alloy was subjected to friction stir processing (FSP) with three different FSP procedures: single pass, single pass with a pre-solution treatment (pre-ST), and two pass. FSP resulted in remarkable grain refinement, significant breakup, and dissolution of the coarse, networklike Mg 17 Al 12 phase. While the single-pass FSP procedure produced a heterogeneous microstructure with Mg 17 Al 12 particle-rich bands, both the pre-ST FSP and the two-pass FSP procedures resulted in the generation of a uniform microstructure. The pre-ST FSP and twopass FSP samples exhibited significantly enhanced strength and ductility due to remarkable grain refinement and dissolution of coarse Mg 17 Al 12 phase. A post-FSP aging resulted in the precipitation of fine Mg 17 Al 12 particle, thereby increasing the strength of the FSP samples. Among three FSP samples, the aged two-pass FSP sample exhibited the highest ultimate tensile strength (UTS) of 356 MPa and an elongation of 17 pct.

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“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] Many studies on the ability of FSW to produce defect-free welds in some magnesium alloys have been published to date. 9,[12][13][14][15] However, as far as the authors know, the influence of FSW parameters on weldability of magnesium alloys has not yet been fully investigated and optimal ''processing window'' for joining has not been determined.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Friction Stir Welding for Joining and Microstructure Refinement in a ZK60 Magnesium Alloy

et al. 2007

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Feasibility of FSW to produce defect-free welds and for microstructure refinement in a ZK60 magnesium alloy has been examined over wide ranges of rotational and welding speeds. The results showed that joined-state was affected very much by the thickness of plates to be joined: for ''thin'' 3-mm thick plates, FSW was successful in a relatively wide range of welding conditions, whereas all ''thick'' 6-mm welds were found to be defective irrespective of rotational and welding speeds used. We have demonstrated that FSW is a very effective tool for microstructure refinement in the ZK60 alloy plates: A coarse, mm-scale, original grain structure was efficiently refined down to fine-grained range. It appears that second-phase particles containing Zr play an important role in the grain refinement.

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Texture and weak grain size dependence in friction stir processed Mg–Al–Zn alloy

Cited by 190 publications

References 20 publications

Using Multiple FSP Passes to Cure Onion Splitting of Mg Alloys Deformed at Elevated Temperatures

Using Multiple FSP Passes to Cure Onion Splitting of Mg Alloys Deformed at Elevated Temperatures

Effect of Friction Stir Processing Procedures on Microstructure and Mechanical Properties of Mg-Al-Zn Casting

Feasibility of Friction Stir Welding for Joining and Microstructure Refinement in a ZK60 Magnesium Alloy

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