难熔元素W/Re对镍基单晶高温合金再结晶的影响
潘智毅1，胡肖兵1，谢 光2，朱银莲1，濮 晟2，马秀良1,*
（1．中国科学院金属研究所沈阳材料科学国家(联合)实验室，辽宁 沈阳 110016；
2．中国科学院金属研究所高温合金部，辽宁 沈阳 110016）
摘 要：两种实验合金（DD00和DD0WR）被设计用于阐明难熔元素W/Re对镍基单晶高温合金再结晶行为的影响。对比DD00合金，加入W/Re的DD0WR合金的再结晶形核阶段被延长，晶粒长大速率减慢，这也意味着DD0WR合金的再结晶行为明显受到抑制。通过透射电镜（TEM）明场像观察，随着热处理时间地延长，DD0WR合金的位错密度消除得更慢。结合TEM中扫描透射电子显微探测器（STEM）和X射线能谱仪（EDS）观察发现，在DD0WR合金中，位错和晶界处有W/Re元素富集。据此可知，对于DD0WR合金，由于难熔元素W/Re在位错和晶界处富集，阻碍了位错运动和晶界迁移，有效地抑制了再结晶的发生。
关键词：镍基单晶高温合金；再结晶；位错；晶界；W/Re元素的分布
中图分类号：TG132.3+2；O783；O77；TG115.21+5.3 文献标识码：A
doi：10.3969/j.1000-6281.2014.03.001
Effects of W and Re on the recrystallization of Ni-based
single crystal superalloys
PAN Zhi-yi1, HU Xiao-bing1, XIE Guang2, ZHU Yin-lian1, PU Sheng2, MA Xiu-liang1,*
（1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Shenyang Liaoning 110016；2．Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang Liaoning 110016, China）
Abstract: Two experimental alloys (DD00 and DD0WR) were designed to assess the effect of refractory elements W and Re on recrystallization of nickel-base single crystal superalloys. Compared with DD00, the incubation stage of recrystallization for DD0WR with W and Re addition was elongated and the growth of grains was slower, which indicates that recrystallization of DD0WR was obviously inhibited. Transmission electron microscope (TEM) investigation shows that dislocations in DD0WR varied more slowly as heat treated time expanded. Furthermore, by means of scanning transmission electron microscopy (STEM) and energy dispersive X-ray spectroscopy (EDS), Re and W enrichment at dislocations and grain boundaries in the alloy DD0WR were found. So the beneficial effect of inhibiting recrystallization should be ascribed to the refractory elements enrichment for preventing dislocation movement and grain boundary migration in the alloy DD0WR.
Keywords:nickel-based single superalloys；recrystallization；dislocations；grain boundaries；W/Re distribution
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