The effects of Cr additions to binary TiAl-base alloys
The effects of Cr additions to binary TiAl-base alloys
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DOI：
10.1007/bf02851355
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发表时间：
1991-11
期刊：
影响因子：
--
通讯作者：
Shyh‐Chin Huang;E. Hall
中科院分区：
文献类型：
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作者：
Shyh‐Chin Huang;E. Hall
利用快速凝固处理的带状块状材料，研究了添加Cr对y基合金的影响。所研究的成分范围为0 ~ 4 at。pet Cr和44 - 54 at。结果表明，Cr的加入对单相γ合金的变形行为没有影响。而对于含有单相γ晶粒和片层γ/α2晶粒的Al-lean双相合金，它们的塑性显著提高。表征了Cr对微观组织、相稳定性、位置占用和变形子结构的其他影响，并将其与观察到的力学行为相关联。结果表明，Cr在双相合金中的延展性作用部分是由于Cr倾向于占据Al晶格位。延展性的部分原因还在于Cr改变了Al的分布，从而提高了转变后α2板条的热稳定性。
The effects of Cr additions to y-base alloys have been investigated, using bulk materials consolidated from rapid solidification-processed ribbons. The composition ranges studied were 0 to 4 at. pet Cr and 44 to 54 at. pet Al. It was found that Cr additions do not affect the deformation behavior of single-phase γ alloys. However, they significantly enhance the plasticity of Al-lean duplex alloys which contain grains of single-phase γ and grains of lamellar γ/α2. Other Cr effects on microstructure, phase stability, site occupancy, and deformation sub-structures were characterized and correlated to the observed mechanical behavior. It was concluded that the ductilization effect of Cr in duplex alloys is partially due to the tendency of Cr to occupy Al lattice sites. Ductilization is also partially due to the ability of Cr to modify the Al partitioning and, therefore, the thermal stability of transformed α2laths.