Deformation behaviour and 6H-LPSO structure formation at nanoindentation in lamellar high Nb containing TiAl alloy

Deformation behaviour and 6H-LPSO structure formation at nanoindentation in lamellar high Nb containing TiAl alloy
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层状高铌 TiAl 合金纳米压痕变形行为和 6H-LPSO 结构形成

DOI:
10.1080/09500839.2015.1009515
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发表时间:
2015-02
影响因子:
1.2
通讯作者:
Lin, J.P.
Lin, J.P.
中科院分区:
材料科学4区
文献类型:
--
作者:
Liang, Y.F.;Shang, S.L.;Liu, Z.K.;Lin, J.P.

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利用聚焦离子束和透射电镜研究了高铌TiAl合金片层团的显微组织和纳米压痕变形机制。纳米压痕周围观察到相当大的变形孪晶,并产生应变梯度。片层组织的弯曲角度可以连续变化,并且观察到应变诱导的晶粒细化过程,因为各种主动变形将γ晶粒分裂成亚晶粒。除了所有可能的变形机制(普通位错,超位错和变形孪晶)激活,由于严重的塑性变形,一个6层六方(6H)的长周期堆叠有序结构被确定为第一次附近的接触区,并被认为是密切相关的部分位错的滑移。
Microstructure and deformation mechanisms at a nanoindentation in the lamellar colony of high Nb containing TiAl alloy have been studied using the focused ion beam and the transmission electron microscopy. Considerable deformation twins are observed around the nanoindentation, and a strain gradient is generated. A continuous change in the bending angle of the lamellar structure can be derived, and a strain-induced grain refinement process is observed as various active deformations split the γ grains into subgrains. In addition to all possible deformation mechanisms (ordinary dislocation, super-dislocation and deformation twining) activated due to the heavy plastic deformation, a 6-layer hexagonal (6H) long-period stacking ordered structure is identified for the first time near the contact zone and is thought to be closely related to the glide of partial dislocations.
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发表时间: 1995-02
期刊: Acta Metallurgica Et Materialia
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