Evolution of Microstructure, Residual Stress, and Tensile Properties of Mg-Zn-Y-La-Zr Magnesium Alloy Processed by Extrusion
Küçük Resim Yok
Tarih
2019
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Chinese Acad Sciences, Inst Metal Research
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
The microstructure, texture, residual stress, and tensile properties of Mg-6Zn-2Y-1La-0.5Zr (wt%) magnesium alloy were investigated before and after extrusion process, which performed at 300 degrees C and 400 degrees C. The microstructural characterizations indicated that the as-cast alloy was comprised of alpha-Mg, Mg-Zn, Mg-Zn-La, and Mg-Zn-Y phases. During homogenization at 400 degrees C for 24 h, most of the secondary phases exhibited partial dissolution. Extrusion process led to a remarkable grain refinement due to dynamic recrystallization (DRX). The degree of DRX and the DRXed grain size increased with increasing extrusion temperature. The homogenized alloy did not show a preferential crystallographic orientation, whereas the extruded alloys showed strong basal texture. The extrusion process led to a significant improvement on the compressive residual stress and mechanical properties. The alloy extruded at 300 degrees C exhibited the highest basal texture intensity, the compressive residual stress and hardness, and yield and tensile strengths among the studied alloys.
Açıklama
Anahtar Kelimeler
ZK60, Magnesium alloy, Residual stress, Texture, Mechanical properties, Extrusion
Kaynak
Acta Metallurgica Sinica-English Letters
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
32
Sayı
11
