Effect of deformation twin on toughness in magnesium binary alloys
Effect of deformation twin on toughness in magnesium binary alloys
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DOI：
10.1080/14786435.2015.1065019
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发表时间：
2015-07
影响因子：
1.6
通讯作者：
H. Somekawa;T. Inoue;K. Tsuzaki
中科院分区：
文献类型：
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作者：
H. Somekawa;T. Inoue;K. Tsuzaki
采用8种Mg-0.3at.%的合金，研究了合金元素对韧性的影响X（X = Al，Ag，Ca，Gd，Mn，Pb，Y和Zn）二元合金的介晶组织。这些二元合金的平均晶粒尺寸约为20 μm。断裂韧性和裂纹扩展行为的合金元素的影响; Mg-Ag和Mg-Pb合金具有最高和最低的合金之间的韧性，分别，无论在其类型的变形孪晶的存在。孪晶界影响裂纹扩展行为在大多数的合金;相反，不仅是断裂相关的孪晶界，但也发生在合金中，包括稀土元素的沿晶断裂。在塑性变形过程中易形成形变孪晶的中、粗晶镁合金中，影响韧性的因素不是晶格参数随化学成分的变化，而是孪晶晶界偏聚能。
The impact of alloying elements on toughness was investigated using eight kinds of Mg-0.3 at.% X (X = Al, Ag, Ca, Gd, Mn, Pb, Y and Zn) binary alloys with meso-grained structures. These binary alloys had an average grain size of approximately 20 μm. The fracture toughness and crack propagation behaviour were influenced by the alloying elements; the Mg–Ag and Mg–Pb alloys had the highest and the lowest toughness amongst the alloys, respectively, irrespective of presence in their type deformation twins. The twin boundaries affected the crack propagation behaviour in most of the alloys; in contrast, not only was the fracture related to the twin boundaries, but also the intergranular fracture occurred in the alloys that included rare earth elements. The influential factor for toughness in the meso- and the coarse-grained magnesium alloys, which readily formed deformation twins during plastic deformation, was not the change in lattice parameter with chemical composition, but the twin boundary segregation energy.