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再结晶退火工艺对Ni-5at%W基带立方织构形成的影响
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Effects of Recrystallization Annealing Process on Development of Cube Textured of Ni-5at%W Alloy Substrate
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    摘要:

    采用粉末冶金与中频感应炉重熔相结合的方法制备Ni-5at%W合金锭,经旋锻和拉拔成为丝材,再冷轧为70 μm厚带材。随后,在800~1300 ℃区间进行0~3 h再结晶退火处理。采用X射线衍射和电子背散射衍射对基带织构进行评估,同时也对基带硬度进行了表征。实验发现,Ni-5 at%W合金基带几乎在800 ℃就已完成初始再结晶过程;在980 ℃退火时,立方织构体积分数随时间的延长(1~3 h)没有发生明显变化;在1100,1300 ℃退火后形成了锐利的立方织构,偏离{001}<100> 8°范围内的晶粒表面积占总晶粒表面积的分数分别为93%,99.8%。在1300 ℃以下温区退火时,基带组织均匀,没有出现晶粒异常长大现象,立方织构具有良好的高温稳定性。当退火温度达1400 ℃时,出现晶粒异常长大现象并伴有其它织构成分出现。

    Abstract:

    A Ni-5at%W ingot was prepared by a combination process of PM and remelting. Afterwards the ingot was swaged and drawn into wires which were finally cold-rolled into trips with 70 μm thickness. A recrystallization annealing for the substrate trip was carried out at different temperatures (800~1300 ℃) for different time (0~3 h). Cube texture in the substrate was evaluated by means of X-ray diffraction and electron back-scatter diffraction, meanwhile, the hardness of the substrate was characterized. It was found that the recrystallization process was almost completed below 800 ℃ and the fraction of cube texture did not obviously change upon annealing time prolonging for 1~3 h at 980 ℃. Strong cube texture was obtained after annealing at 1100 ℃ and 1300 ℃, and the surface area fraction of the grains orientated within 8° around ideal {001}<100> texture were about 93% and 99.8% of the total grains, respectively. After the substrate trip was annealed at and below 1300 ℃, its microstructure was uniform, no abnormal grain growth was found, and the cube texture exhibited good stability at high temperature. However, abnormal grain growth and other texture components appeared in the substrate trip after annealed at 1400 ℃.

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张永军,张平祥,李成山,郑会玲,于泽铭,卢亚锋,陈绍楷.再结晶退火工艺对Ni-5at%W基带立方织构形成的影响[J].稀有金属材料与工程,2009,38(4):705~708.[Zhang Yongjun, Zhang Pingxiang, Li Chengshan, Zheng Huiling, Yu Zeming, Lu Yafeng, Chen Shaokai. Effects of Recrystallization Annealing Process on Development of Cube Textured of Ni-5at%W Alloy Substrate[J]. Rare Metal Materials and Engineering,2009,38(4):705~708.]
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  • 收稿日期:2008-04-10
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