Microstructure and plastic deformation in (C11_b/C40) duplex-phase silicide with a sigle set of lamellae

单组片晶 (C11_b/C40) 双相硅化物的微观结构和塑性变形

• 批准号: 13650760
• 负责人: NAKANO Takayoshi
• 金额: $ 2.24万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650760/
• 关键词: Transition metal silicide; Lamellar structure; Single crystal; Deformation and fracture; Slip system; Variant; Continuity of strain; C11_b phase; シリサイド; ラメラー組織; 破壊・変形; C11b; C40; C49; 界面制御; 複相シリサイド; 超高温耐熱材料; 転位; NbSi_2; 界面; 方向制御層状組織

Microstructures of duplex-phase C40/C11_b silicides from combinations of NbSi_2, Vsi_2 or TiSi_2 with MoSi_2 were investigated focusing on formation and alignment of lamellae. The lamellar structure was formed by zone melting and subsequent appropriate heat treatment for all combinations, but oriented lamellae were obtained only in NbSi_2 / MoSi_2 duplex crystals. The oriented lamellar structure satisfied the crystallographic relationship of (0001) _<C40> // (110) _<C11b>, < 1^^-21^^-0] _<C40> // [11^^-0] _<C11b> and < 101^^-0] _<C40> // [001] _<C11b>, resulting in formation of three variants of the C11_b phase and two kinds of boundary: a type of C11_b/C11_b grain boundary and a type of C11_b/C40 phase boundary. Further annealing induced coarsening of both phases and changed the crystallographic relation due to relaxation of misfit strain at boundaries.

研究了NbSi_2、Vsi_2和TiSi_2与MoSi_2复合制备的C40/C11_b双相硅化物的微观结构，重点研究了片层的形成和排列。所有组合均通过区熔和适当的热处理形成片层结构，但只有NbSi_2 / MoSi_2双相晶体获得了取向片层结构。取向层状结构满足（0001）_<C40> // (110) _<C11b>, < 1^^-21^^-0] _<C40> // [11^^-0] _<C11b> // [101^^-0] _<C11b> // [001] _<C11b>的晶体学关系，形成了C11_b相的三种变化和两种晶界：C11_b/C11_b晶界和C11_b/C40相界。进一步退火引起两相的粗化，并且由于边界处失配应变的松弛而改变了晶体学关系。

项目成果

T. Nakano, M. Azuma and Y. Umakoshi: "Tensile deformation and fracture behaviour in NbSi_2 and MoSi_2 single crystals"Acta Materialia. 50 [14]. 3731-3742 (2002)

T. Nakano、M. Azuma 和 Y. Umakoshi：“NbSi_2 和 MoSi_2 单晶的拉伸变形和断裂行为”Acta Materialia。

T. Nakano, H. Biermann, M. Riemer, H. Mughrabi, Y. Nakai and Y. Umakoshi: "Classification of γ/γ and γ/α_2 lamellar boundaries on the basis of continuity of strains and slip/twinning planes in fatigued TiAl PST crystals"Philosophical Magazine A. 81 [6]. 1

T. Nakano、H. Biermann、M. Riemer、H. Mughrabi、Y. Nakai 和 Y. Umakoshi：“基于疲劳疲劳中应变和滑移/孪晶面的连续性对 γ/γ 和 γ/α_2 层状边界进行分类TiAl PST晶体》哲学杂志A.81[6].1

T.Nakano, Y.Umakoshi et al.: "Tensile deformation and fracture behavior in NbSi_2 and MoSi_2 single crystals"Acta Materialia. 50・14. 3731-3742 (2002)

T.Nakano、Y.Umakoshi 等：“NbSi_2 和 MoSi_2 单晶的拉伸变形和断裂行为”Acta Materialia 50・14 (2002)。

T.Nakano et al.: "Microstructure and plastic deformation in unidirectionally solidified nbSi_2(C40)/MoSi_2(C11b)crystals"Mat. Res. Soc. Sympo. Proc.. 646. N5. 35. 1-N5. 35. 6 (2001)

T.Nakano 等：“单向凝固 nbSi_2(C40)/MoSi_2(C11b) 晶体的微观结构和塑性变形”Mat。

T.Nakano, Y.Nakai, Y.Umakoshi: "Microstructure and plastic deformation in unidirectionally solidified NbSi_2(C40)/ MoSi_2(C11_b) crystals"Mat. Res. Soc. Sympo. Proc.. 646. N5.35.1-N5.35.6 (2001)

T.Nakano、Y.Nakai、Y.Umakoshi：“单向凝固 NbSi_2(C40)/ MoSi_2(C11_b) 晶体的微观结构和塑性变形”Mat。