Order-disorder phenomena inα-brass - III. Influence of plastic deformation
Order-disorder phenomena inα-brass - III. Influence of plastic deformation
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DOI：
10.1098/rspa.1960.0157
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发表时间：
1960-09
期刊：
影响因子：
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通讯作者：
L. Clarebrough;M. Hargreaves;M. Loretto
中科院分区：
文献类型：
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作者：
L. Clarebrough;M. Hargreaves;M. Loretto
变形α-黄铜试样在加热过程中储能的演变与以前观察到的纯金属完全不同;储能要大得多，至少存在三个演变阶段。这些已被研究的变形在扭转和拉伸和相关的电阻率，密度和硬度的测量结果。在前两个阶段的能量的大释放主要是由于恢复的顺序破坏塑性变形，重冷加工后的无序程度远大于淬火后（第二部分）。然而，轻微的变形（10%的张力）会略微增加有序度。能量释放的第一阶段，低于120 °C，可能是由于在变形过程中产生的空位辅助下的快速重新排序。第二阶段代表了大部分的重新排序和一些恢复涉及重排和湮灭的位错。变形的试样可能是应变时效的，因此恢复伴随着锌气氛的分散，这增加了电阻率并降低了密度，在一定程度上抵消了恢复的影响。这三个过程在第二阶段的平衡导致了复杂的行为，一些性质变化的幅度甚至符号随着变形而变化。在进一步回复和重结晶的第三阶段开始之前，重新排序是完全的，在第三阶段中，大气的分散也很重要。能量、电阻率和密度测量的比较表明，高浓度的层错对电阻率有贡献。退火硬化观察到更高的变形和最大硬度与最大程度的秩序。
The evolution of stored energy during heating for specimens of deformed α-brass is quite different from that previously observed for pure metals; the stored energy is much larger and at least three stages of evolution exist. These have been studied for deformation in torsion and tension and the results correlated with measurements of electrical resistivity, density and hardness. The large release of energy in the first two stages is attributed mainly to the return of order destroyed by plastic deformation; the degree of disorder after heavy cold work is much greater than after quenching (part II). However, slight deformation (10% tension) increases the degree of order slightly. The first stage of energy release, below 120 °C, is probably due to rapid reordering assisted by vacancies created during deformation. The second stage represents the bulk of the reordering and some recovery involving rearrangement and annihilation of dislocations. The deformed specimens are probably strain-aged and thus recovery is accompanied by the dispersal of atmospheres of zinc which increases resistivity and decreases density, to some extent counteracting the effects of recovery. The balance of these three processes in stage 2 causes complex behaviour, the magnitude and even the sign of some changes in properties varies with the deformation. Reordering is complete before the beginning of the third stage of further recovery and recrystallization, in which dispersal of atmospheres is again important. Comparison of measurements of energy, resistivity and density suggests that the high concentration of stacking faults contributes to the resistivity. Anneal hardening is observed for the higher deformations and the maximum hardness coincides with the maximum degree of order.