Abstract
In this work, the Mg-3Sn-2Al-1Zn (TAZ321, wt. %) alloy with excellent high temperature resistance was compressed using a Gleeble-3500 thermo-mechanical simulator at a wide temperature and the strain rate range. The kinetics analyses showed that the dominant deformation mechanism was likely caused by the cross slipping of dislocations. A constitutive equation which expressed the relationship between the flow stress, deformation temperature, and strain rate was established, and the average activation energy Q was calculated to be 172.1 kJ/mol. In order to delineate the stability and instability working domains, as well as obtain the optimum hot working parameters of the alloy, the hot processing maps in accordance with Prassad’s criterion are constructed at the true strain of 0.2, 0.4, 0.6, and 0.8, respectively. Based on the hot processing map and microstructure observation, the optimum hot working parameter was determined to be 350 °C/1 s−1. The continuous fine dynamic recrystallization (CDRX) grains occurred in the optimum deformation zone. The predicted instability domains was identified as T = 200–300 °C, = 10−2–1 s−1, which corresponded to the microstructure of deformation twinning and micro cracks at the intersection of grain boundaries.
Highlights
The Mg-Sn alloy has been considered as a typical heat-resistance magnesium alloy owing oy has been constiodetrheedeaxsistaentycpeiocfalhhigehatm-resltiisntagnMcegm2Sangpnhesaisuems (Talmlo–y770 ◦C) [1,2], which have a strong potential for high melting Mg2hSinghptheamsepser(aTtum–re77s0tru°cCt)ur[a1l,2a]p, pwlihcaictihonhsa. vTehearesftorroen,git is essential to investigate the hot deformation re structural applibcaethioanviso. rTshienroefrodreer, tiot idseessisgennotifaslutopeinrivoersptiegraftoermthaenhcoetMg-Sn alloys. der to design of superioTropoeurfrokrmnoawncledMgge,Ssnevaelrloayl sw. orks have been done on the hot deformation behaviors of Mg-Sn ral works have beaellnoydso[n3e–6o]n
Compression tests were conducted on a Gleeble-3500 thermo-mechanical simulator (Dynamic Systems Inc., New York, NY, USA) at the temperature range of 200–350 ◦C and a strain rate of 10−3–1 s−1
X-ray diffraction (XRD) results (Figure 1a) exhibit that the alloy is mainly composed of α-Mg phases, and some weak peaks representing Mg2Sn phases can be observed
Summary
The Mg-Sn alloy has been considered as a typical heat-resistance magnesium alloy owing oy has been constiodetrheedeaxsistaentycpeiocfalhhigehatm-resltiisntagnMcegm2Sangpnhesaisuems (Talmlo–y770 ◦C) [1,2], which have a strong potential for high melting Mg2hSinghptheamsepser(aTtum–re77s0tru°cCt)ur[a1l,2a]p, pwlihcaictihonhsa. vTehearesftorroen,git is essential to investigate the hot deformation re structural applibcaethioanviso. rTshienroefrodreer, tiot idseessisgennotifaslutopeinrivoersptiegraftoermthaenhcoetMg-Sn alloys. der to design of superioTropoeurfrokrmnoawncledMgge,-Ssnevaelrloayl sw. orks have been done on the hot deformation behaviors of Mg-Sn ral works have beaellnoydso[n3e–6o]n. Orks have been done on the hot deformation behaviors of Mg-Sn ral works have beaellnoydso[n3e–6o]n. RInX c(oCnDtrRaXst) taontdhedMiscgo-n8tSinuboaussedDaRllXoys with high Sn content, Mg-3Sn based alloys ning mechanismsw[5i]t.hIna clonwterarsatmtootuhnetMofg-S8nSndibdasneodt aolnlolysdwecitrheahsieghthe density and solid solution temperature of loys with a loweraallmoyou[7n]t, bouf tSanlsdoidexnhoibt iotendlyhidgehcerreatesnestihleesdtreennsgityh and elongation [8]. Materials 2020, 13, 312 hot deformation behaviors of the Mg-3Sn alloy in the literature mainly focuses on the Mg-3Sn-1Ca alloy [3,4]. Limited research was conducted on the hot deformation behaviors of Mg-3Sn-Al-Zn system alloys. %) and investigate the hot deformation behaviors of the alloys in terms of a kinetic analysis, hot processing map, and microstructure evolution. Hot deformation mechanisms and dynamic recrystallization (DRX) behaviors during the hot deformation process were analyzed and discussed
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