HPT-induced shear banding and nanoclustering in a TiNiCu amorphous alloy
HPT-induced shear banding and nanoclustering in a TiNiCu amorphous alloy
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DOI：
10.1016/j.matlet.2017.08.028
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发表时间：
2017-12
影响因子：
3
通讯作者：
E. Ubyivovk;E. Boltynjuk;D. Gunderov;A. Churakova;A. Kilmametov;R. Valiev
中科院分区：
文献类型：
--
作者：
E. Ubyivovk;E. Boltynjuk;D. Gunderov;A. Churakova;A. Kilmametov;R. Valiev
采用透射电镜对快淬非晶合金Ti 50 Ni 25 Cu 25在高压扭转下的微观组织进行了详细的研究。研究了高压涡轮加工圆盘形试样的横截面。剪切带（SB）组上显示从HPT处理的样品切片。由于应变诱导的纳米晶化，纳米晶直接在剪切带中形成。在SBs周围的非晶相中形成了尺寸为20 nm的非晶纳米团簇。首次发现了剪切带周围非晶团簇结构的形成。研究结果表明，高温高压处理后MS Ti 50 Ni 25 Cu 25合金中纳米团簇结构的形成与非晶相中SB的传播有着密切的联系。
Special TEM procedure is used to study in detail the microstructure of the melt-spun (MS) amorphous alloy Ti50Ni25Cu25subjected to high-pressure torsion (HPT). The cross section of an HPT-processed disc-shaped sample is studied. Groups of shear bands (SBs) are revealed on the lamellae cut from the HPT-processed samples. Nanocrystals form directly in the shear bands as a result of strain-induced nanocrystallization. Amorphous nanoclusters with a size of 20 nm form in the amorphous phase surrounding the SBs. Formation of the amorphous cluster-type structure in the areas surrounding the shear bands has been discovered for the first time. The obtained results reveal a close connection between the nanocluster structure formation in the HPT-processed MS Ti50Ni25Cu25alloy and SBs propagation in the amorphous phase.