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that the dislocation density of pure tantalum is not high and dislocation cells occur after 95% cold rolling reduction. Because the stacking fault energy (SFC) of tantalum is high, the dislocation cross slips easily which can lower the dislocation density. On the other hand, according to the tree dislocation theory, it is assumed that when pure tantalum is deformed at room temperature, the slip system......
and sample annealed at 110 ℃, GP zone are the main precipitates. The different flow behaviors are ascribed to the type of precipitates as well as the dislocation density differences. Key words: aluminum alloy; Portevin-Le Chatelier effect; precipitation; dislocation ......
dislocations caused by normalized cooling are recovered and rearranged into cell substructures, and then the dislocation density is reduced gradually. Finally a low density linear dislocation configuration and a stabler dislocation network are formed and ferritic grains grow considerably. Key words:pearlitic heat-resistant steel; aging; recovery; dislocation; sub-structure; dislocation cell; [全文内容正在添加......
to the stress concentration at the vicinity of twin boundary introduced by the dislocation pile-ups at the vicinity of twinning boundary. The rearrangement of dislocation after dislocation climb introduces new... the original grain under the shear stress with further straining. Key words: magnesium alloys; twinning; dislocation rearrangement; grain refinement CLC number: TG111.7 Document code: A 1 ......
阶段还是在稳态阶段,本文所建立的"两阶段"式位错密度模型与实验所获的位错密度变化曲线的吻合程度都较高,说明"两阶段"式位错密度模型能准确描述7A85铝合金在塑性变形过程的位错密度演变规律. 图5 不同变形条件下的位错密度预测值与实验值曲线 Fig. 5 Comparison between experimental and predicted dislocation..., 李玉玺. 40Cr冷滚打成形中位错密度变化研究[J]. 中国机械工程, 2013(16): 2248-2252. WANG Xiao-qiang, CUI Feng-kui, YAN Gen-peng, LI Yu-xi. Study on dislocation density change during cold roll-beating of 40Cr[J]. China......
Alloy design by dislocation engineeringM.X.Huang,B.B.HeDepartment of Mechanical Engineering, The University of Hong Kong摘 要:Ultra-high strength alloys... composition(atomic length scale) or manipulating ultra-fine and nano-grained microstructure(grain length scale). The intermediate length scale between atomic and grain scales is the dislocation length scale......
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analyzer at room temperature. Granato and Lucke dislocation pinning model was employed to explain damping properties of the alloys. It is found that reducing impurity content can decrease the amount... damping capacity in the relatively high strain region than that with higher impurity concentration, which appears to originate mainly from different dislocation characteristics. The variation tendency......
