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Plastic Anisotropy and Fatigue Fracture Mechanism of TiAl Alloys under Cyclic Loading.

Plastic Anisotropy and Fatigue Fracture Mechanism of TiAl Alloys under Cyclic Loading.
循环加载下TiAl合金的塑性各向异性和疲劳断裂机制。
批准号:
07455282
负责人:
UMAKOSHI Yukichi
金额:
$4.8万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (B)
财政年份:
1995
资助国家:
日本
项目状态:
已结题
起止时间:
1995 至 1996

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中文摘要
翻译
研究了TiAl复合孪晶(PST)的循环变形和疲劳断裂行为,重点研究了总应变幅值、片层结构以及加载轴与片层平面夹角(phi)的影响。疲劳试验在室温下循环拉伸压缩模式下进行。在φ =0和45时,材料的塑性行为具有很强的各向异性。在phi=0 ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄许多位错和孪晶根据γ畴的类型而被激活,它们的运动在γ / γ畴和α _2/ γ片层边界处被中断,形成非均匀变形亚结构。当φ =45 ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄骨折常发生在alpha_2钢板的基面上。位错在平行于层状平面的(111)平面上简单地滑动,并传播了很长的距离,因为γ / γ畴边界没有对位错的运动起到强大的屏障作用。在φ =0和45时,层状结构的细化可以有效地提高疲劳寿命。
英文摘要
The cyclic deformation and fatigue fracture behavior of TiAl polysynthetically twinned (PST) crystals were investigated, focusing on the effects of total strain amplitude, lamellar structure and the angle (phi) between the loading axis and the lamellar planes. Fatigue tests were performed in cyclic tension-compression mode at room temperature. Strong anisotropy in plastic behavior was observed at phi=0゚ and 45゚.At phi=0゚ the stress amplitude incrteased with the number of cycles and the cyclic hardening became significant as the strain amplitude increased. Numerous dislocations and twins were activated depending on the types of gamma domain, and their motion was interrupted at the gamma/gamma domain and alpha_2/gamma lamellar boundaries resulting in an infomogeneous deformation substructure. Specimens with phi=45゚ showed weak cyclic hardening and broke without significant hardening. Fracture often occurred on the basal plane in the alpha_2 plates. Dislocations glided simply on (111) planes parallel to the lamellar planes and traveled a long distance since the gamma/gamma domain boundaries did not act as strong barrier to the motion of dislocations. Refinement of the lamellar structure is effective in achieving an increased fatigue life at both phi=0゚ and 45゚.
期刊论文(34)
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会议论文
H. Y. Yasuda: "Cyclic deformation behavior of TiAl alloys containing oriented lamellae" Phil. Mag. A. 71・1. 127-138 (1995)
H. Y. Yasuda:“含有取向片层的 TiAl 合金的循环变形行为”Phil. A. 71-138 (1995)。
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发表时间:
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通讯作者:
Y.Umakoshi: "Deformation and Fracture of TiAl PST Crystals under Monotonic and Cyclic Loading" Acta Metall.Sinica. Vol.8, No.4. 329-338 (1995)
Y.Umakoshi:“单调和循环载荷下 TiAl PST 晶体的变形和断裂”金属学报。
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通讯作者:
Y.Umakoshi: "Deformation and fracture of TiAl PST crystals under monotonic and cyclic loading" Acta.Metall.Sinica. 8・4. 329-338 (1995)
Y.Umakoshi:“单调和循环载荷下 TiAl PST 晶体的变形和断裂”Acta.Metall.Sinica. 8・4 (1995)。
DOI: --
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通讯作者:
Y.Umakoshi: "Plastic anisotropy and fracture behavior of cyclically deformed TiAl PST crystals" Mater.Sci.Eng.,A. 192/193. 511-517 (1995)
Y.Umakoshi:“循环变形 TiAl PST 晶体的塑性各向异性和断裂行为”Mater.Sci.Eng.,A。
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共 32 条
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    • 项目类别:
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    • 资助金额:
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    • 财政年份:
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    • 负责人:
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    • 项目类别:
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    • 资助金额:
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