Question

专业英语求翻译，材料化学方面的。

1 (a) Briefly explain the difference among edge,screw,and mixed dislocations in terms of the relative orientation line and Burgers vector.
(b) For each of edge,screw,and mixed dislocation,cite the relationship between burgers vector and the direction line motion.
2 Based on our textbook and what we have learnt,cite not less than four techniques to strengthen and harden aluminum metal in aviation?
3 Briefly describe types of short-circuit diffusion and its contribution tothe overall diffusion flux.
4 (a) For each of edge,screw,and mixed dislocation,cite the relationship between the direction of the applied shear stress and the direction of dislocation line motion.
(b) Cite one reason why ceramic materials are,in general,harder yet more brittle than metals.
5 Describe and explain solid-solution strengthening for substitutional impurity atoms(smaller or larger than host atoms)in terms of lattice strain interactions with dislocations.
6 (a) Suppose that Li2O is added as an impurity to MgO,If the Li+ substitutes for Mg2+,what kind of vacancies would you expect to form?How many of these vacancies are created for every Li+ added?
(b) Suppose that MgCl2 is added asimpurity to MgO.If the Cl- substitutes for O2-,what kind of vacancies would you expect to form?How many of these vacancies are created for every Cl- added?

Answer 1

1(一)简要解释差异优势,螺杆、混合分布在相对方位线的条款和汉堡的向量。
(b),为每一个的边缘,螺杆,和混合脱位,引证关系向量和方向汉堡线运动。
2根据我们的教材,我们学了些什么,引用不少于四个技术来加强和变硬铝金属在航空兵呢?
简要描述三种短路扩散到整体贡献扩散通量。
4(a),为每一个的边缘,螺杆,和混合脱位,引证关系应用剪切应力的方向和方向脱位线运动。
(b)引用的一个原因是陶瓷材料,一般来说,越硬脆金属更多比。
5描述和解释solid-solution替代强化杂质原子(小或大原子比主人的角度应变之间的相互作用在格脱臼。
6(一)假设Li2O加作为杂质对氧化镁,如果李+的替代Mg2 +,什么样的职位你希望形式吗?这些病例中,有多少是为每一个创造职位李+补充吗?
(b)假设MgCl2 asimpurity分别添加到。 如果Cl - O2 -替代品,什么样的职位你希望形式吗?这些病例中,有多少是为每一个职位创造Cl -补充吗