Study of the mechanical properties of Mg-7.7at.% Al by<i>in-situ</i>neutron diffraction

Gharghouri, Michael A.; Weatherly, G. C.; Embury, J.D.; Root, J.H.

doi:10.1080/01418619908210386

Cited by 287 publications

(157 citation statements)

References 14 publications

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“…This behavior of the 0.4Gd alloys is consistent with the behavior of the Mg-Zn and Mg-Al alloys reported in [5,6,9,11,13]. By the same token, the lack of difference between tension and compression for the 1.5Gd alloys, and the reversion, i.e., larger anelastic strain in tension, for the…”

Section: Tension-compression Anelastic Behaviorsupporting

confidence: 76%

“…The larger anelastic strain in compression than in tension for the pure Mg and the dilute (0.4Gd) alloy is consistent with the notion that the behavior arises from a combination of the polar nature of twinning and the fact that the twin mode with the lowest activation stress is the 'tension" {1012} twin: in a random polycrystal, the fraction of grains having their c-axis favourably oriented for (tension) twinning is larger under a compressive stress than under a tensile stress [5,[9][10][11]15]. This behavior of the 0.4Gd alloys is consistent with the behavior of the Mg-Zn and Mg-Al alloys reported in [5,6,9,11,13].…”

Section: Tension-compression Anelastic Behaviorsupporting

confidence: 66%

“…Gharghouri et al [5,6] used neutron diffraction to show that the partial reversion of {10 ̅ 2} twins upon unloading is the main cause of the loops in pure Mg and Mg-Al. An in-situ study on cast AZ31 alloy [13] also showed that {10 ̅ 1} twins form during unloading on grains with the c-axis normal (or nearly so) to the tensile direction, adding to the overall anelastic strain.…”

Section: Introductionmentioning

confidence: 99%

“…These twins are not fully stable in the deformed state [4] and tend to partly revert, once the applied stress is removed [5] or reversed [6,7], leading to hysteresis loops during loading and unloading. This type of hysteresis loops have been reported in pure Mg and Mg-Al [5,6,[8][9][10], and Mg-Zn [11]. Similar loops have also been observed in Zr [12].…”

Section: Introductionmentioning

confidence: 99%

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Anelasticity in cast Mg-Gd alloys

Nagarajan

2017

Materials Science and Engineering: A

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Cyclic loading-unloading tests in tension and compression were carried out on pure Mg and alloys with 0.4, 1.5 and 4.2 at.% Gd, over a range of grain sizes, to quantify the solute and strain dependence of the materials anelasticity in the form of hysteresis loops. For a given grain size, the anelastic effect was more pronounced, i.e., the loops were wider, for pure Mg, and it decreased rapidly with the Gd concentration. The effect was larger for the finer grains in all materials, and in compression for the pure Mg and the 0.4Gd alloy. No difference between tension and compression was observed for the 1.5Gd alloy, whereas the loops were wider in tension than in compression for the 4.2Gd alloy. In comparison with existing studies in Mg-Al and Mg-Zn alloys, for a given solute concentration, Gd was more effective in reducing the magnitude of the effect than either Zn or Al, in that order. The overall behavior is discussed in terms of the hardening effects of short range order of the alloys on {1012} and {1011} twinning.

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Section: Tension-compression Anelastic Behaviorsupporting

confidence: 76%

Section: Tension-compression Anelastic Behaviorsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Anelasticity in cast Mg-Gd alloys

Nagarajan

2017

Materials Science and Engineering: A

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“…[44,45] It is well established that second phases in ductile materials are known to increase strength for which the theory is well established. [46][47][48] In alloys containing a ductile primary phase, the strain hardening is related to the volume fraction and modulus of the dispersed particles for strains lower than 1 pct. [47] The role of intermetallic phases in strengthening has been verified in die-cast Mg-Al [49,50] and Mg-RE [36] binary alloys, in which the yield strength showed a monotonic increase with increasing content of the alloying element.…”

Section: A Microstructure/tensile Properties Relationshipmentioning

confidence: 99%

Evaluation of Magnesium Die-Casting Alloys for Elevated Temperature Applications: Microstructure, Tensile Properties, and Creep Resistance

Zhu

Easton

Abbott³

et al. 2015

Metall Mater Trans A

122

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Several families of magnesium die-casting alloys have been developed to operate at the elevated temperatures experienced in automotive powertrain applications. Most alloys are based on the Mg-Al system with alloying additions such as silicon, strontium, calcium, and rare earth elements (RE), although alloys with RE as the primary alloying constituent are also considered. This work presents an evaluation of the tensile properties and creep resistance of the most common magnesium die-casting alloys, in conjunction with the analysis of microstructure. The alloys investigated include AS31 (Mg-3Al-1Si), AJ52 (Mg-5Al-2Sr), MRI153A (Mg-9Al-1Ca-0.1Sr), MRI153M (Mg-8Al-1Ca-0.3Sr), MRI230D (Mg-6.5Al-2Ca-1Sn-0.3Sr), AXJ530 (Mg5Al-3Ca-0.2Sr), AE42 (Mg-4Al-2RE), AE44 (Mg-4Al-4RE), and AM-HP2+ (Mg-3.5RE-0.4Zn). It is shown that, among the various alloys evaluated, MRI230D, AXJ530, and AM-HP2+ have higher yield strength than the Al alloy A380, but the ductility is relatively low at room temperature for these alloys. In contrast, AS31 and the AE series alloys have very good room temperature ductility, but their yield strength is lower than that of A380. In terms of creep resistance, MRI230D, AXJ530, AE44, and AM-HP2+ are all comparable to the Al alloy counterpart at 423 K and 448 K (150°C and 175°C). Microstructural factors that are most important to the strength and creep resistance of the Mg die-casting alloys are discussed.

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