金属间化合物TiAl(W, Si)合金的蠕变行为和机制
Creep behavior and mechanisms of intermetallic TiAl (W, Si) alloy
查看参考文献15篇
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文摘
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研究了Ti-47Al-2W-0.5Si合金在650～750 ℃区间的蠕变任为和变形机制。结果表明，合金650 ℃蠕变寿命与施加应力之间符合线性的双对数关系，可用表达式lgt_f-101gσ+30来描述。蠕变寿命与最小蠕变速率之间满足Monkman-Grant关系的修正式。合金的比蠕变强度与抗热腐蚀镍基高温合金K438G相当。在700 ℃变载荷下蠕变时具有与恒载荷下蠕变相类似的特征。800 ℃长期时效粗化合金组织，降低蠕变寿命。位错滑移和形变孪生是合金蠕变的主要变形机制。 |
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其他语种文摘
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Creep behavior and mechanisms of Ti-47Al-2W-0.5Si cast alloy have been investigated. THe results show that the creep rupture time at 650 ℃ decreases rapidly with the increasing of applied stress, and can be expressed by the formula lgt_f - 101gσ + 30. The creep rupture time and minimum creep rate fit a linear double-logarithmic relationship, and can be described with the revision of Monkman-Grant relationship. Its creep strength is comparable to the density-corrected strength of nickel-based corrosion-resistant superalloy K438G. Step-like various load creep has similar deformation characteristics compared with constant-load creep. Long period aging at 800 ℃ coarsens the lamellar structure, and subsequently lowers the creep rupture life. Dislocation gliding and deformation twinning are attributed to the dominant creep mechanisms. |
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来源
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航空学报
,2002,23(4):302-306 【核心库】
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关键词
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金属间化合物
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高温结构材料
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TiAl
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力学性能
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蠕变
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地址
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1.
中国科学院金属研究所高温合金研究室, 辽宁, 沈阳, 110016
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中国科学院金属研究所, 辽宁, 沈阳, 110016
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CNR-TEMPE, Via R. Cozzi 53, 20125 Milano, 意大利
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-6893 |
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学科
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航空 |
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文献收藏号
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CSCD:1001014
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