In-situ SEM and TEM tensile observations of novel Co-Al-W-Mo-Ta-B-Ce alloys with a coherent γ-CoSS/γ’-Co3(Al,W) microstructure at room temperature
In-situ SEM and TEM tensile observations of novel Co-Al-W-Mo-Ta-B-Ce alloys with a coherent γ-CoSS/γ’-Co3(Al,W) microstructure at room temperature
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室温下具有相干 γ-CoSS/γ-Co3(Al,W) 微观结构的新型 Co-Al-W-Mo-Ta-B-Ce 合金的原位 SEM 和 TEM 拉伸观察
DOI：
10.1016/j.msea.2017.04.040
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发表时间：
2017-06
期刊：
影响因子：
--
通讯作者：
J. B. Sha
中科院分区：
文献类型：
--
作者：
F. Zhong;Y. Y. Xin;S. S. Li;J. B. Sha
利用SEM和TEM原位研究了γ ′-Co 3（Al，W）强化的Co-9Al-4.5W-4.5Mo-2 Ta-0.02B-（0.01，0.1）Ce合金（以下分别称为0.01Ce合金和0.1Ce合金）的滑移带-晶界相互作用。对于具有γ/γ ′-Co 3（Al，W）共格组织的0.01Ce合金，{111}<1 1 0>位错在γ通道中萌生，随后切入相邻的γ ′相。小角度晶界（LAGB）是必要的滑移带转移机制。当引入易滑移系的对齐因子M>0.8和引出滑移系的Schmid因子>0.3时，滑移带通过LAGB转移。大角度晶界（HAGB）通常具有低M值，并且传入的滑移带在HAGB处被阻挡而不转移;相反，邻近晶粒中具有最高Schmid因子的独立滑移系统被激活。γ/γ ′-Co 3（Al，W）组织的塑性变形和滑移带-晶界的相互作用使0.01Ce合金的伸长率达到16.4%。在0.1Ce合金的晶界处有一些Co 3 W沉淀物，滑移带绕过、切穿或有时被沉淀物阻止，导致2.1%的低延伸率和混合的韧窝和解理失效。
Slip band-grain boundary interactions of γ’-Co3(Al,W)-strengthened Co-9Al-4.5W-4.5Mo-2Ta-0.02B-(0.01, 0.1)Ce alloys (referred to as 0.01Ce alloy and 0.1Ce alloy, respectively, hereafter) were investigated in-situ using SEM and TEM. For the 0.01Ce alloy with a γ/γ’-Co3(Al, W) coherent microstructure, the {1 1 1}<1 1 0> dislocations initiate in the γ channels and subsequently cut into the neighbouring γ’ phase. A low-angle grain boundary (LAGB) is necessary for the slip band transfer mechanism. The slip bands transfer through the LAGB when the alignment factor M>0.8 with the incoming easy-slip system and the Schmid factor >0.3 on the outgoing slip system. The high-angle grain boundaries (HAGBs) usually have a low M value and the incoming slip bands are blocked at the HAGBs without transfer; instead, independent slip systems with the highest Schmid factor in the neighbouring grain are activated. The plastic deformation of the γ/γ’-Co3(Al,W) microstructure and the slip band-grain boundary interactions lead to an elongation of 16.4% of the 0.01Ce alloy. With some Co3W precipitates at the grain boundary of the 0.1Ce alloy, the slip bands bypass, cut through, or sometimes are arrested by the precipitates, resulting in a low elongation of 2.1% and a mixed dimple and cleavage failure.
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DOI：
10.1016/j.msea.2013.02.007
发表时间：
2013-06
影响因子：
6.4
作者：
F. Pyczak;A. Bauer;M. Göken;S. Neumeier;U. Lorenz;M. Oehring;N. Schell;A. Schreyer;A. Stark-A.-Star
通讯作者：
F. Pyczak;A. Bauer;M. Göken;S. Neumeier;U. Lorenz;M. Oehring;N. Schell;A. Schreyer;A. Stark-A.-Star
DOI：
10.1016/j.msea.2014.05.044
发表时间：
2014-09
影响因子：
6.4
作者：
Huilong Yan;J. Coakley;V. Vorontsov;N. Jones;H. Stone;D. Dye
通讯作者：
Huilong Yan;J. Coakley;V. Vorontsov;N. Jones;H. Stone;D. Dye
DOI：
10.1155/tsm.20.195
发表时间：
1993
期刊：
--
影响因子：
--
作者：
Tadao Watanabe
通讯作者：
Tadao Watanabe
影响因子：
8.3
作者：
L. Klein;B. V. Bartenwerffer;M. Killian;P. Schmuki;S. Virtanen
通讯作者：
L. Klein;B. V. Bartenwerffer;M. Killian;P. Schmuki;S. Virtanen
影响因子：
4.4
作者：
H.-Y. Yan;V. Vorontsov;D. Dye
通讯作者：
H.-Y. Yan;V. Vorontsov;D. Dye