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Role of applied uniaxial stress during creep testing on precipitation in Mg-Nd alloys

机译：蠕变试验中施加的单轴应力对Mg-Nd合金中析出的作用

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摘要

The coupled effects of an applied stress and temperature, during creep testing at 90 MPa/177 ℃, on intragranular second phase (orthorhombic β′ and fcc β_1 phases) precipitation in a binary Mg-0.5 at% Nd alloy were investigated by comparing and contrasting with second phase precipitation under isothermal (177 ℃) annealing conditions. In the early stages of creep deformation, after 5 h, homogeneous precipitation of fine scale β′ was observed within the α-Mg matrix, while on the other hand, only small pockets of Nd enrichment were observed in the isothermally annealed sample after 5 h, indicating that β′ precipitation is accelerated during creep testing. With respect to β_1 precipitation, these precipitates appeared to decorate dislocation lines primarily, which is indicative of a dislocation stress-field assisted precipitation mechanism, in both creep tested and isothermally annealed samples. Interestingly, the β_1 precipitates appear to grow and coarsen more rapidly in the case of the isothermally annealed sample than in the creep tested sample. The differences between the precipitation behavior of β′ and β_1 phases under the influence of stress and temperature (creep testing) vs. only under isothermal annealing conditions have been rationalized based on the crystal structures of these phases and their elastic interaction energies with the stress-fields associated with dislocations as well as bulk applied stress.
机译：通过比较和对比，研究了在90 MPa / 177℃蠕变测试期间施加的应力和温度对二元Mg-0.5 at％Nd合金中晶内第二相（斜方晶β'和fccβ_1相）析出的耦合作用。在等温（177℃）退火条件下进行第二相沉淀。在蠕变变形的早期阶段，在5 h后，在α-Mg基质中观察到了细小尺度的β'的均匀沉淀，而在5 h后，等温退火的样品中仅观察到了少量的Nd富集。 ，表明在蠕变测试期间β'沉淀被加速。对于β_1沉淀，这些沉淀似乎主要是修饰了位错线，这表明在蠕变测试和等温退火的样品中，位错应力场辅助的沉淀机理。有趣的是，在等温退火的样品中，β_1沉淀物的生长和粗化比蠕变测试的样品更快。根据这些相的晶体结构及其在应力作用下的弹性相互作用能，合理化了β'和β_1相在应力和温度（蠕变试验）与仅在等温退火条件下的析出行为之间的差异。与位错以及整体施加应力相关的场。

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