Al含量对γ-TiAl合金断裂行为的影响

梁月慧; 祁文军

doi:10.7513/j.issn.1004-7638.2022.05.014

Al含量对γ-TiAl合金断裂行为的影响

doi: 10.7513/j.issn.1004-7638.2022.05.014

梁月慧,
祁文军^,

新疆大学机械工程学院, 新疆乌鲁木齐 830017

基金项目: 新疆维吾尔自治区自然科学基金（2021D01C051）。

详细信息

作者简介:
梁月慧，1994年出生，女，汉族，江苏灌云人，硕士研究生，主要研究领域为金属材料分子动力学研究，E-mail：632975414@qq.com

通讯作者:
祁文军，1968年出生，女，汉族，新疆乌鲁木齐人，教授，硕士研究生导师，主要研究领域为材料加工领域中的数字化设计与制造、智能制造关键技术研发与应用，E-mail：wenjuntsi@163.com

中图分类号: TF823,TG146
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- 被引次数: 0
出版历程
- 收稿日期: 2022-03-02
- 刊出日期: 2022-11-01

Effect of Al content on fracture behavior of γ-TiAl alloy

Liang Yuehui,
Qi Wenjun^,

College of Mechanical Engineering, Xinjiang University, Urumqi 830017, Xinjiang, China

摘要

摘要: 利用分子动力学研究了300 K温度下，Al含量在45%～49%范围内时，单晶γ-TiAl合金单轴拉伸的裂纹扩展机理和力学性能变化。分析了Al含量为45%的γ-TiAl合金拉伸过程中裂纹演变过程和Al含量在45%～49%时γ-TiAl合金的应力-应变曲线、总能量随时间变化曲线。研究表明：Al含量会影响材料的性能，Al含量为45%的γ-TiAl合金拉伸过程中产生的Lomer-Cottrell位错对裂纹的扩展行为也有很大影响。由于堆垛层错，位错和孔洞的产生及位错反应和运动，以及Al含量降低导致材料的屈服强度增加。Al含量在45%～49%范围内的γ-TiAl合金随Al含量减少，材料的屈服应力和弹性模量增大。
- γ-TiAl合金 /
- 断裂行为 /
- Al含量 /
- 分子动力学 /
- 单晶 /
- 应力-应变 /
- 总能量
Abstract: The crack growth mechanism and mechanical properties of single crystal γ-TiAl alloy with 45%～49% Al under uniaxial tension at 300 K had been investigated be means of molecular dynamics. The crack development of γ-TiAl alloy with 45% Al content during tensile process and the stress-strain curve and the total energy variation curve with time for γ-TiAl alloy with 45%～49% Al content were analyzed.The results show that Al content affects the properties of the γ-TiAl alloy, and the Lomer Cottrell dislocation produced during the tensile process of γ-TiAl alloy containing 45% Al content has a great influence on the mechanism of crack propagation. Stacking fault, dislocation and holegeneration,dislocation reaction and movement, and decreasing Al content can all contribute to the increasing yield strength of γ-TiAl alloy. The yield stress and elastic modulus of γ-TiAl alloy increase with the decrease of Al content in the range of 45%～49%.
- γ-TiAl alloy /
- fracture behavior /
- Al content /
- molecular dynamics /
- single crystal /
- stress-strain /
- the total energy

HTML全文

图 1 γ-TiAl的L₁₀晶体结构

Figure 1. L₁₀ structure of γ-TiAl

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图 2 γ-TiAl合金的原子模型

Figure 2. Atom model of γ-TiAl alloy

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图 3 γ-Ti45 Al合金的原子模型

Figure 3. Atom model of γ-Ti45Al alloy

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图 4 不同时刻Ti45Al的原子运动轨迹

Figure 4. Atomic trajectories of Ti45Al at different moments

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图 5 罗曼-柯垂尔位错锁

Figure 5. Lomer Cottrell dislocation lock

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图 6 弛豫过程中总能量随时间的演变过程

Figure 6. Total energy as function of loading time during relaxation process

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图 7 拉伸过程中总能量随时间的演变

Figure 7. Total energy as function of loading time during tensile process

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图 8 不同Al含量的γ-TiAl合金的应力-应变曲线

Figure 8. Stress-strain curves of γ-TiAl alloys with different Al contents

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表 1 不同Al含量的γ-TiAl合金微观缺陷演变时间

Table 1. Evolution time of microdefects in γ-TiAl alloys with different Al contents

合金成分	第一个位错形核时间/ps	发生变形时间/ps	断裂时间/ps	屈服应力/GPa
Ti45Al	205	206.5	220.5	12.24
Ti46Al	203	207.3	215	12.06
Ti47Al	197	200.3	212	11.75
Ti48Al	179.9	195	207	11.57
Ti49Al	177.2	178	206	11.22

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