High strength, nano-structured Mg–Al–Zn alloy

Zheng, Baolong; Ertörer, Osman; Liu, Ying; Zhou, Yizhang; Mathaudhu, Suveen; Tsao, Chi Y.A.; Lavernia, Enrique J.

doi:10.1016/j.msea.2010.11.073

Cited by 80 publications

(29 citation statements)

References 52 publications

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“…Considering the production method and the average particle size of the employed AZ91 powder (105 lm), it can be concluded that the grains of this powder should have had micrometer dimensions. The crystallite size of MM AZ91 powder was measured to be 25 nm using the Williamson-Hall method [33], which is in good agreement with those previously reported for high-energy milled Mg-based powders [20,21]. Various models have been proposed to describe the mechanism of formation of nanostructures by high-energy milling [34].…”

Section: Starting Microstructuresupporting

confidence: 82%

“…A number of studies have also examined the microstructural characteristics, thermal stability, and mechanical properties of nanocrystalline Mg alloys processed by mechanical milling. It has been reported that the grain sizes of Mg and its alloys can be refined to 30-50 nm through mechanical milling, and nanocrystalline Mg alloys produced by high-energy milling show excellent resistance to grain growth during isothermal annealing and/or subsequent consolidation processes at high temperatures, leading to superior mechanical properties for the bulk alloys consolidated from mechanically milled Mg-based powders [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Hot workability of nanocrystalline AZ91 magnesium alloy

Jabbari-Taleghani

Torralba

2014

Journal of Alloys and Compounds

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This study examined the hot deformation behavior and workability characteristics of nanocrystalline AZ91 Mg alloy by performing hot compression tests with a Gleeble-3800 machine. To this end, a nano-crystalline alloy powder with a crystallite size of 25 nm was synthesized via mechanical milling of a pre-alloyed AZ91 Mg alloy powder for 14 h. The mechanically milled (MM) AZ91 powder was subse-quently cold pressed at 600 MPa into cylindrical compacts measuring 10 mm in diameter and 12 mm in height. Then, the powder compacts with a relative green density of 91% were hot-compressed at tem-peratures ranging from 150 °C to 500 °C and at true strain rates ranging from 0.001 s À1 to 10 s À1 .The true stress-true strain curves peaked at low strains, after which the flow stress increased moderately. Processing maps were developed for all of the hot compression tests at strains of 0.1, 0.5, and 0.8, which represented a safe deformation domain at deformation temperatures and strain rates in the ranges of 250-350 °C and 0.1-10 s À1 . The crystallite size of the nanocrystalline AZ91 Mg alloy hot-compressed within the aforementioned domain was measured to be 140 nm, which is considered very fine for Mg alloys and resulted in a high hardness value of 133 HV for the hot-compressed alloy.

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Section: Starting Microstructuresupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Hot workability of nanocrystalline AZ91 magnesium alloy

Jabbari-Taleghani

Torralba

2014

Journal of Alloys and Compounds

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“…9 shows a bright field TEM image with bimodal microstructure, and no sign of twinning was observed. This contrasts reports of twinning in other nanostructured magnesium alloys with higher alloying contents [29,48,49]. The stress required for twin nucleation increases substantially with reducing grain size to the nanometre scale, thereby reducing the occurrence of twinning as grain size is reduced [45].…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 92%

“…A novel manufacturing technology that comprises a combination of cryomilling and spark plasma sintering has recently been successfully applied to fabricate nanocrystalline Mg-30Al and AZ80 alloys [29][30][31][32]. The nanocrystalline AZ80 exhibited an excellent compressive yield stress of 442 MPa and ultimate compressive strength of 546 MPa with an average compressive strain to failure of 3.7%.…”

Section: Introductionmentioning

confidence: 99%

On the use of cryomilling and spark plasma sintering to achieve high strength in a magnesium alloy

Guan

Rainforth

Sharp

et al. 2016

Journal of Alloys and Compounds

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“…Both the initial discharge capacity and capacity retention rate of MgNi alloy were much greater than those of Mg 2 Ni alloy. The nanocrystalline Mg-Al-Zn alloy were synthesized by Zheng et al [76] via a cryomilling and spark plasma sintering approach and its mechanical behavior and microstructure were alsoreported and discussed. Their results showed that cryomilling for 8 h the Synthesis of Nanomaterials and Nanocomposites yielded nc Mg agglomerates, approximately 30 µm in size, with an internal average grain size of approximately 40 nm.…”

Section: Mg-based Nanomaterials and Nanocompositesmentioning

confidence: 99%

Mechanical Milling: a Top Down Approach for the Synthesis of Nanomaterials and Nanocomposites

Yadav¹,

Yadav²,

Singh³

2012

531

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Synthesis of nanomaterials by a simple, low cost and in high yield has been a great challenge since the very early development of nanoscience. Various bottom and top down approaches have been developed so far, for the commercial production of nanomaterials. Among all top down approaches, high energy ball milling, has been widely exploited for the synthesis of various nanomaterials, nanograins, nanoalloy, nanocomposites and nano -quasicrystalline materials. Mechanical alloying techniques have been utilized to produce amorphous and nanocrystalline alloys as well as metal/non-metal nanocomposite materials by milling and post annealing, of elemental or compound powders in an inert atmosphere. Mechanical alloying is a non-equilibrium processing technique in which different elemental powders are milled in an inert atmosphere to create one mixed powder with the same composition as the constituents. In high-energy ball milling, plastic deformation, cold-welding and fracture are predominant factors, in which the deformation leads to a change in particle shape, cold-welding leads to an increase in particle size and fracture leads to decrease in particle size resulting in the formation of fine dispersed alloying particles in the grain-refined soft matrix. By utilizing mechanical milling various kind of aluminium/ nickel/ magnesium/ copper based nanoalloys, wear resistant spray coatings, oxide and carbide strengthened aluminium alloys, and many other nanocomposites have been synthesized in very high yield. The mechanical milling has been utilized for the synthesis of nanomaterials either by milling and post annealing or by mechanical activation and then applying some other process on these activated materials. This review is a systematic view of the basic concept of mechanical milling, historical view and applications of mechanical milling in the synthesis of various nanomaterials, nanosomposites, nnaocarbons and nano quasicrystalline materials.

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High strength, nano-structured Mg–Al–Zn alloy

Cited by 80 publications

References 52 publications

Hot workability of nanocrystalline AZ91 magnesium alloy

Hot workability of nanocrystalline AZ91 magnesium alloy

On the use of cryomilling and spark plasma sintering to achieve high strength in a magnesium alloy

Mechanical Milling: a Top Down Approach for the Synthesis of Nanomaterials and Nanocomposites

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