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[求助]
求助关于位错密度等问题，如图所示
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A tilt boundary along the xy-plane can be envisaged to consist of a series of parallel edge dislocations, all with the same Burgers vector b with a length of 0.23 nm. The boundary has dimensions of x = 30 μm by y = 15 μm. The tilt angle ・is 6o around an axis in the x direction. A) What is the direction of the dislocation lines (x, y or z)? B) What is the distance between dislocations in the boundary, both in meters and in number of atomic distances? C) Calculate the dislocation density ρ・(defined as dislocation line length per unit of volume) in a volume x × y × z = 30 μm × 15 μm × 1 μm enclosing the grain boundary. D) In the case of a random distribution of dislocations the dislocation energy per unit of volume is given by Ed = ½μb2ρ, with μ the shear modulus (160 GPa). Discuss the relation between this dislocation energy and the interfacial energy γ. E) Calculate Ed from the dislocation density found in question c) F) Give the equation expressing the relation between the dislocation energy Ed and the interfacial energy γ. What is the resulting value of γ? G) The value for the interfacial energy calculated along the line in the previous questions is higher than the actual value of the interfacial energy. Explain why.  新建位图图像.jpg |
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2楼2015-10-18 04:35:33