Mechanical properties and structure of age-hardened Ti-Cu alloys
Mechanical properties and structure of age-hardened Ti-Cu alloys
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时效硬化Ti-Cu合金的机械性能和结构
DOI：
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发表时间：
1970
期刊：
影响因子：
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通讯作者：
S. Weissmann
中科院分区：
文献类型：
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作者：
G. Lütjering;S. Weissmann
时效硬化Ti-Cu合金的室温拉伸性能为0.9和4 at。pct Cu，进行了研究。结果与微观结构和观察到的移动位错与析出颗粒之间的相互作用机制有关。在400 ~ 500℃时效时，观察到两种类型的析出物。一种类型被确定为亚稳态，有序沉淀与基体相一致。另一类是与基体部分共融的稳定Ti3Cu相。这两种类型的颗粒都是由β→α相变形成的马氏体组织析出。虽然马氏体组织导致了高流变应力，但断裂伸长率主要由位错-颗粒相互作用机制决定。在含有均匀分布、部分共融的Ti3Cu颗粒的结构中，通过诱导位错旁通机制获得了最大的断裂伸长率。低温时效使Ti3Cu颗粒在晶界上优先析出的倾向最小化。
The room temperature tensile properties of age-hardened Ti-Cu alloys, 0.9 and 4 at. pct Cu, were investigated. The results were correlated to the microstructure and to the observed interaction mechanism between moving dislocations and precipitated particles. Two types of precipitates were observed upon aging between 400° and 500°C. One type was identified as a metastable, ordered precipitate coherent with the matrix. The other type was the stable Ti3Cu phase which was partially coherent with the matrix. Both types of particles were precipitated from a martensitic microstructure which resulted from the β → α transformation. Although the martensitic microstructure contributed to the high flow stress, the elongation to fracture was principally determined by the dislocation-particle interaction mechanism. The maximum elongation to fracture was obtained by inducing a dislocation by-pass mechanism in a structure containing homogeneously distributed, partially coherent Ti3Cu particles. The tendency of the Ti3Cu particles to precipitate preferentially on boundaries was minimized by low temperature aging.