Origin of texture weakening in a rolled ZEX4101 alloy sheet and its effect on room temperature formability and tensile property

JOURNAL OF ALLOYS AND COMPOUNDS

卷:782

Article

Nakata, T.¹  Xu, C.²  Uehara, Y.¹  Sasaki, T. T.³  Kamado, S.¹ 

[1] Nagaoka Univ Technol, 1603-1 Kamitomioka, Nagaoka, Niigata 9402188, Japan

[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China

[3] Natl Inst Mat Sci, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan

关键词: Magnesium;    Rolling;    Room temperature formability;    Texture;   

DOI  :  10.1016/j.jallcom.2018.12.194

来源: Elsevier

【 摘 要 】

A Ca-containing Mg-4Zn-1MM(mischmetal)-0.1Ca (wt.%, ZEX4101) alloy sheet shows Index Erichsen value of 6.7 mm, which is better than commercial Mg alloy sheets. The good formability is attributed to its weakened basal texture, in which the intensity of the (0001) poles of the recrystallized grains spreads towards the transverse direction. By monitoring the microstructural evolution during the hot rolling and the solution treatment, we found that Ca addition hinders the formation of strong basal texture during the rolling. During the subsequent solution treatment, static recrystallization mainly proceeds by the growth of dynamically recrystallized grains, and then the weak texture feature of the dynamically recrystallized grains is maintained in the ZEX4101 alloy sheet. It is hypothesized that co-segregation of Zn and Ca atoms to the grain boundaries prevents the rotation of the (0001) poles of the dynamically recrystallized grains toward the sheet normal direction, resulting in the development of weak basal texture in the ZEX4101 alloy sheet. (C) 2018 Elsevier B.V. All rights reserved.

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