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[求助]
以下三道題目請各位幫忙解答一下,萬分感謝……
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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層厚度x(t0),它是線性和拋物線極限的交點[提示:將等式(21.54)和(21.55)中給出的x(t)表達式設為相等。你認為這種厚度會怎樣隨溫度而變化? 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計算Fe1-xCx合金中C的at %s。 (b)用0.1、1.0和9 wt%Cu計算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,假設每平方厘米有108位錯線。碳原子遷移到位錯核中,在那里他們可以找到低能點。需要多少C來飽和所有的位錯磁芯(即。,在每個原子平面上沿每個位錯線放置一個C原子)?把你的答案表示成每立方米C個原子的濃度,原子分數(shù)x,重量百分比。 |
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