本实验在用钨靶的连续X射线,摄出冷拔铜线的织构斑点图,据以寻出斑点强度峰植距离、宽度、(111)环上〈111〉及〈100〉纤维轴的斑点峰值比,及其分离程度等与断面减缩率的关系。目的在寻出一较简便的方法,可用以估计同一原始铜线经不同冷拔后的屈服应力,及比较不同冷拔方法的加工效率。另一方面在了解不同冷拔铜线屈服应力差异与晶体织构变化的关系,并求出不同断面减缩率时〈111〉/〈100〉取向量的比值,可据为核验范性形变中织构形成理论的定量指标。初步分析结果,表明二纤维轴上的晶粒取向量,逼近地遵从波尔兹曼形式的分布规则,即分布几率f_(hkl)∝e~(-KE)_(hkl)且E_(hkl)∝△A/A(铜线断面减缩率)。
Diffraction patterns of W radiation of the cold-drawn copper wire are investigated. Theexpansion of interplanar spacing, the half-peak width of spot, the ratio of peak values of densityof spots corresponding to (111) and (100) fibre axes etc. are correlated to the amount of reduc-tion of cross-sectional areas. The difference of yield-strengths of wires of same total percentageof reduction of area and different number of drawings may be accounted for by the structuralchanges as shown by the difference in the textures. By the graph plotted, it is shown that the distribution of densities of spots correspondingto (111) and (100) fibre axes approximately follows the distribution law of Boltzmann type;i.e. f(hkl) ∝ e~(-KE)(hkl), and E_(hkl) ∝ △A/A (the fraction of the reduction of the cross-sectional area of wire).
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