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花儿爷

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[求助] 以下三道题目请各位帮忙解答一下,万分感谢……

21.6 Find the a-SiO2 layer thickness x(t0) that is the crossover between the linear and parabolic limits [Hint: Set the expressions for x(t) given in Eqs.(21.54) and (21.55) equal to each other.] How would you expect this thickness to vary with temperature?
Eqs.(21.54): x(t)=(k_s c_0 t)/(2N(O))=(B^' t)/A^'
Eqs.(21.55): x^2 (t)=(Dc_0 t)/(N(O))=B^' t
求出a-SiO2层厚度x(t0),它是线性和抛物线极限的交点[提示:将等式(21.54)和(21.55)中给出的x(t)表达式设为相等。你认为这种厚度会怎样随温度而变化?
Eqs.(21.54): x(t)=(k_s c_0 t)/(2N(O))=(B^' t)/A^'
Eqs.(21.55): x^2 (t)=(Dc_0 t)/(N(O))=B^' t










21.7 For binary alloys such as Fe1-xCx and Al1-xCux;
(a) Calculate the at %s of C in Fe1-xCx alloys with 0.1, 1.0, and 9 wt%C.
(b) Calculate the at %s of Cu in Al1-xCux alloys with 0.1, 1.0, and 9 wt%Cu.

用于二元合金,如Fe1-xCx和Al1-xCux;
(a)用0.1、1.0和9 wt%C计算Fe1-xCx合金中C的at %s。
(b)用0.1、1.0和9 wt%Cu计算Al1-xCux合金中Cu的at %s。













21.8 In a Fe1-xCx alloy, assume that there are 108 dislocation lines per square centimeter present. Carbon atoms migrate to the dislocation cores where cores where they find lower energy sites. How much C is required to saturate all the dislocation cores (i.e., to place one C atom per atomic plane along each dislocation line)? Express your answer as a concentration of C atomic per cubic meter, as an atomic fraction x, and as a weight percent.
在Fe1-xCx合金中,假设每平方厘米有108位错线。碳原子迁移到位错核中,在那里他们可以找到低能点。需要多少C来饱和所有的位错磁芯(即。,在每个原子平面上沿每个位错线放置一个C原子)?把你的答案表示成每立方米C个原子的浓度,原子分数x,重量百分比。
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