Influence of Strain Reversals during High Pressure Torsion Process on Strengthening in Al-Cu-Mg(-Li) Alloy
Influence of Strain Reversals during High Pressure Torsion Process on Strengthening in Al-Cu-Mg(-Li) Alloy
复制标题
高压扭转过程中应变反转对Al-Cu-Mg(-Li)合金强化的影响
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Wenlong Zhou
中科院分区：
文献类型：
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作者：
Jiuwen Zhang;M. Starink;N. Gao;Wenlong Zhou
采用显微硬度（Hv）和差示扫描量热法（DSC）研究了Al_xCu_xMg（xLi）合金在高压扭转（HPT）过程中应变反转的强化作用。发现与单调HPT（m-HPT）相比，循环HPT（c-HPT）和单反转HPT（sr-HPT）两者的强化都较低。DSC结果表明，|HPT影响S相析出。随着应变的增加，最大热流（S峰的高度）和S形成峰的热含量增加。在HPT处理过的磁盘的周边有一个更大的S热含量的反应相比，在中心。应变反转对S沉淀也有显著影响。在HPT变形过程中的强化进行了讨论的统计存储和几何必要的位错密度。
The strengthening of AlCuMg(Li) alloys subjected to high pressure torsion (HPT) deformation with strain reversals was studied by microhardness (Hv) tests and differential scanning calorimetry (DSC). It was found that the strengthening is lower for both cyclic HPT (c-HPT) and single reversal HPT (sr-HPT) as compared to monotonic HPT (m-HPT). The DSC results demonstrate that |HPT influences S phase precipitation. With increasing strain, the maximum heat flow (height of the S peak) and the heat content of S formation peaks increases. There is a larger S heat content reaction in the periphery of HPT processed disks compared with those in the centre. Strain reversal also has a significant influence on the S precipitation. The strengthening during HPT deformation is discussed in terms of the density of statistically stored and geometrically necessary dislocations.