The mechanical properties of OFHC copper and CuCrZr alloys after asymmetric rolling at ambient and cryogenic temperatures
The mechanical properties of OFHC copper and CuCrZr alloys after asymmetric rolling at ambient and cryogenic temperatures
复制标题
OFHC铜和CuCrZr合金在常温和低温下不对称轧制后的机械性能
DOI：
10.1515/eng-2018-0041
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发表时间：
2018
期刊：
影响因子：
1.7
通讯作者：
I. Pokorný
中科院分区：
文献类型：
--
作者：
R. Kočiško;T. Kvačkaj;A. Kováčová;Dušan Šimčák;R. Bidulský;M. Lupták;M. Vlado;I. Pokorný
摘要：本文比较了不对称环境轧制（ASaR）和不对称低温轧制（AScR）制备的OFHC铜和CuCrZr合金的力学性能。主辊直径的不同保证了不对称轧制的条件。在常温和液氮温度下，样品的厚度减小了20% ~ 70%。对所有轧制样品的屈服强度、抗拉强度、面积收缩率和显微硬度等力学性能进行了测定。低温轧制可使Cu合金的抗拉强度提高50-60MPa，常温轧制可使CuCrZr合金的抗拉强度提高60- 80mpa。CuCrZr合金AScR后，在434°C时开始析出，再结晶是析出峰的一部分。结果表明，低温条件下低层错能（CuCrZr）材料的塑性变形以剪切带为主。
Abstract This work deals with comparing the mechanical properties of OFHC copper and CuCrZr alloys processed by asymmetric ambient rolling (ASaR) and asymmetric cryorolling (AScR). The conditions for asymmetrical rolling were ensured by different diameters of the main rolls. The thickness of samples was reduced about 20% - 70% at ambient temperature and at a temperature of liquid nitrogen. Mechanical properties such as yield strength, tensile strength, reduction of area and microhardness were determined for all rolled samples. Rolling at cryogenic temperatures provide about 50-60MPa more tensile strength for Cu and 60-80 MPa for CuCrZr alloys when rolling at ambient temperature. After AScR of CuCrZr alloys, a start of precipitation was shifted at the temperature of 434∘C and recrystallization was a part of the precipitation peak. According to the results, plastic deformation through shear bands is the dominant mechanism in materials with lower stacking fault energy (CuCrZr) treated under cryogenic conditions.