Rapidly Solidified Powder Metallurgy Mg&lt;SUB&gt;97&lt;/SUB&gt;Zn&lt;SUB&gt;1&lt;/SUB&gt;Y&lt;SUB&gt;2&lt;/SUB&gt;Alloys with Excellent Tensile Yield Strength above 600 MPa

Kawamura, Y.; Hayashi, Kentaro; Inoue, Akihisa; Masumoto, T.

doi:10.2320/matertrans.42.1172

Cited by 1,066 publications

(425 citation statements)

References 9 publications

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“…The rapidly solidified powder metallurgy Mg 97 Zn 1 Y 2 alloy exhibits a yield strength of 610 MPa and an elongation of 5%, and the chip consolidated Mg 97 Zn 1 Y 2 alloy has a yield strength of 430 MPa and an elongation of 3%. 1,6) The effect of rapid solidification and chipping can be estimated to be increases of approximately 50% and 20% in yield strength, respectively. This improvement is due to the refinement of grain size.…”

Section: Comparison Of Mechanical Properties With Conventional Alloysmentioning

confidence: 99%

Formation and Mechanical Properties of Mg97Zn1RE2 Alloys with Long-Period Stacking Ordered Structure

2007

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We investigated the formation and mechanical properties of Mg 97 Zn 1 RE 2 alloys with long-period stacking ordered (LPSO) structures by examining RE = Y, La, Ce, Pr, Sm, Nd, Gd, Dy, Ho, Er, Tb, Tm and Yb. The LPSO phase developed for RE = Y, Dy, Ho, Er, Gd, Tb and Tm. LPSO Mg-Zn-RE alloys are either type I, in which the LPSO phase forms during solidification: Mg-Zn-Y, Mg-Zn-Dy, Mg-Zn-Ho, Mg-Zn-Er and Mg-Zn-Tm, or type II, in which the LPSO phase is nonexistent in as-cast ingots but precipitates with soaking at 773 K: Mg-Zn-Gd and MgZn-Tb. The criteria for REs that form an LPSO phase in Mg-Zn-RE alloys are discussed. Mg-Zn-RE alloys with an LPSO phase, which were worked by hot extrusion, include high strength both at ambient and elevated temperatures, and good ductility. Their tensile yield strength, ultimate strength and elongation were 342-377 MPa, 372-410 MPa and 3-9%, respectively at ambient temperature, and 292-310 MPa, 322-345 MPa and 4-13% at 473 K. The LPSO Mg-Zn-RE alloys are promising candidates for lightweight structural materials.

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Section: Comparison Of Mechanical Properties With Conventional Alloysmentioning

confidence: 99%

Formation and Mechanical Properties of Mg97Zn1RE2 Alloys with Long-Period Stacking Ordered Structure

2007

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“…Unfortunately, some of the properties of conventional Mg alloys, such as strength, ductility and thermal stability, are inferior to those of competitor light alloys, which restrict their application. Following the development of an ultra-high strength Mg-2Y-1Zn (at%) alloy by rapidly solidified powder metallurgy (RS P/M) processing [2], Mg-RE-Zn (where RE represents rare earth elements) alloys exhibiting superior mechanical properties at both room and elevated temperatures have drawn considerable interest. Due to the presence of RE elements and Zn, these alloys contain long-period stacking ordered (LPSO) structures [3,4].…”

Section: Introductionmentioning

confidence: 99%

Evolution of microstructure and mechanical properties of an as-cast Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy processed by high pressure torsion

Sun

Qiao

et al. 2017

Materials Science and Engineering: A

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Abstract:The novel Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy with high content of rare earth elements has been processed successfully by high pressure torsion (HPT) starting from an as-cast condition. HPT processing was conducted at room temperature for a range of turns from 1/8 to 16, and the evolutions of microstructure and microhardness were investigated.The average grain size decreases from ~85 μm in the as-cast condition to ~55 nm when the equivalent strain reaches ~6.0, and remains almost constant on further strain increase. Meanwhile, the coarse netlike Mg3(Gd,Y) second phase structures are gradually broken into fine dispersed particles and the dislocation density increases. The microhardness of the alloy increases with increasing strain, and when the equivalent strain reaches ~6.0, the microhardness reaches a saturated value of about 115 HV, which is higher than that obtained by conventional extrusion / rolling of this alloy. The full range of possible mechanisms of hardening are analysed and this reveals that hardening is primarily due to the pronounced grain refinement, which is substantially 2 stronger than that for HPT-processed conventional Mg alloys, and to the homogeneously distributed fine second phase particles and the high dislocation density.

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“…The nature of these properties has been intensively studied by both experimental and theoretical approaches. [1][2][3][4] However, many important physical constants of Mg alloys with LPSO phase are still unclear. This is because large single crystals of LPSO phase have so far been unobtainable.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Thermal Expansion Coefficient of 18R-Synchronized Long-Period Stacking Ordered Magnesium Alloy

Yasuda

Kimura

2016

Mater. Trans.

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We measured the thermal expansion coef cients of an 18R-synchronized long-period stacking ordered magnesium alloy (Mg 85 Zn 6 Y 9 ) and an α-phase pure magnesium (α-Mg). This was achieved by using a Gandol camera, which was attached on a high precision diffractometer at SPring-8 BL40XU beamline. By using this system, ne powder diffraction data could be obtained even from a highly oriented Mg 85 Zn 6 Y 9 polycrystal at different temperatures between 95 and 440 K. The thermal expansion coef cients along a-and c-axes were determined from the re ned cell parameters. The thermal expansion coef cients of the Mg 85 Zn 6 Y 9 are smaller than those of the α-Mg.

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Rapidly Solidified Powder Metallurgy Mg<SUB>97</SUB>Zn<SUB>1</SUB>Y<SUB>2</SUB>Alloys with Excellent Tensile Yield Strength above 600 MPa

Cited by 1,066 publications

References 9 publications

Formation and Mechanical Properties of Mg<SUB>97</SUB>Zn<SUB>1</SUB>RE<SUB>2</SUB> Alloys with Long-Period Stacking Ordered Structure

Formation and Mechanical Properties of Mg<SUB>97</SUB>Zn<SUB>1</SUB>RE<SUB>2</SUB> Alloys with Long-Period Stacking Ordered Structure

Evolution of microstructure and mechanical properties of an as-cast Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy processed by high pressure torsion

Measurement of Thermal Expansion Coefficient of 18<i>R</i>-Synchronized Long-Period Stacking Ordered Magnesium Alloy

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