期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 27, 期 1, 页码 29-34出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/S1005-0302(11)60021-2
关键词
Magnesium alloys; Yield asymmetry; Texture; Grain size; Equal channel angular pressing (ECAP)
资金
- National Natural Science Foundation of China [50471082, 50571102]
The yield asymmetry between compression and tension of magnesium alloy Mg-3Al-1Zn (AZ31) with different grain sizes and textures has been studied by tensile and compressive testing of as-cast, as-extruded and equal channel angular pressed (ECAPed) specimens. The significant yield asymmetry (the ratio of yield strength between compression and tension sigma(yc)/sigma(yt) is similar to 0.44) was found in as-extruded specimens and the corresponding microstructure evolution during deformation revealed that {1012} tensile twinning is the underlying reason for the large yield asymmetry. Strong texture and grain size are influential factors for large yield asymmetry. The separate contributions of grain size and texture on yield asymmetry were investigated.
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