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Offsetting strength-ductility tradeoff in Mg-Sn-Zn-Zr alloy by a novel differential-thermal ECAP process.

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Bibliographic Details
Title: Offsetting strength-ductility tradeoff in Mg-Sn-Zn-Zr alloy by a novel differential-thermal ECAP process.
Authors: Zhou, Tianshui1,2 (AUTHOR), Guo, Feifei1,2 (AUTHOR), Zhang, Quanfa1,2 (AUTHOR), Liu, Dexue1,2 (AUTHOR) dxliu@lut.cn
Source: Materials Letters. Dec2021, Vol. 305, pN.PAG-N.PAG. 1p.
Subjects: Tensile strength, Alloys, Grain refinement, Magnesium alloys, Metalwork
Abstract: • A novel T6-DTECAP process was developed. • The T6-DTECAPed Mg alloys showed high UTS of ~323 MPa and excellent El. of ~28.7%. • The deformation mechanisms were mainly the activation of twinning and non-basal slip. • The good performance was associated with grain refinement, second phase and texture. Equal-channel angular pressing (ECAP) technique is a promising method to enhance the properties of Mg alloys. Herein, a novel differential-thermal ECAP process (DTECAP) with pre-aging treatment (T6) was developed to simultaneously improve strength and ductility of Mg-Sn-Zn-Zr (TZK) alloys. After T6-DTECAP, the TZK alloy exhibited high ultimate tensile strength (UTS) of ~323 MPa and excellent elongation (El.) of ~28.7%, showing superior balance of strength and ductility. Examination microstructures of TZK alloys revealed that the excellent comprehensive properties were mainly associated with the activation of {10–12} tension twin variants and non-basal slips. Moreover, the grain refinement, fine second phases, and transition of strong ED texture to fiber (10–10) < 11–20 > texture along TD were also beneficial for the enhanced properties. This work aims to provide a novel insight for the development of high-performance Mg alloys using T6-DTECAP processing. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:• A novel T6-DTECAP process was developed. • The T6-DTECAPed Mg alloys showed high UTS of ~323 MPa and excellent El. of ~28.7%. • The deformation mechanisms were mainly the activation of twinning and non-basal slip. • The good performance was associated with grain refinement, second phase and texture. Equal-channel angular pressing (ECAP) technique is a promising method to enhance the properties of Mg alloys. Herein, a novel differential-thermal ECAP process (DTECAP) with pre-aging treatment (T6) was developed to simultaneously improve strength and ductility of Mg-Sn-Zn-Zr (TZK) alloys. After T6-DTECAP, the TZK alloy exhibited high ultimate tensile strength (UTS) of ~323 MPa and excellent elongation (El.) of ~28.7%, showing superior balance of strength and ductility. Examination microstructures of TZK alloys revealed that the excellent comprehensive properties were mainly associated with the activation of {10–12} tension twin variants and non-basal slips. Moreover, the grain refinement, fine second phases, and transition of strong ED texture to fiber (10–10) < 11–20 > texture along TD were also beneficial for the enhanced properties. This work aims to provide a novel insight for the development of high-performance Mg alloys using T6-DTECAP processing. [ABSTRACT FROM AUTHOR]
ISSN:0167577X
DOI:10.1016/j.matlet.2021.130764