Microstructure and mechanical properties of Ti-40 Wt Pct Ta (Ti-15 At. Pct Ta)
Microstructure and mechanical properties of Ti-40 Wt Pct Ta (Ti-15 At. Pct Ta)
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DOI：
10.1007/bf02651588
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发表时间：
1994-03
期刊：
影响因子：
--
通讯作者：
J. Cotton;J. Bingert;P. Dunn;R. A. Patterson
中科院分区：
文献类型：
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作者：
J. Cotton;J. Bingert;P. Dunn;R. A. Patterson
在β-同晶的Ti-X合金系统中，Ti-Ta是研究最少的系统之一。本文研究了Ti-40wt%Ta(Ti-15at.Pct Ta)进行了调查。在810℃的温度下，在连续的富Ta的β基质中形成了由富钛晶型组成的两相组织，这表明β转变温度高于最新发表的相图所示。810℃水淬火使β相部分转变为正交马氏体(α)，而炉冷产生二次相，两种情况下等温形成的初生相α都保持不变。随后的时效导致马氏体转变为1a型加残余β，强度相应增加，塑性降低。最大延伸率(20%的延伸率)发生在保持亚稳β的水淬态条件下。对真实应力应变数据的分析表明，相变诱发塑性可能有助于提高水火材料的塑性。
Of the β-isomorphous Ti-X alloy systems, Ti-Ta is one of the least studied. In the current work, the microstructure and mechanical properties of Ti-40 wt pct Ta (Ti-15 at. pct Ta) are investigated. Annealing at 810 °C produces a two-phase microstructure consisting of Ti-richaidiomorphs in a continuous Ta-rich β matrix; this suggests the β-transus temperature is higher than indicated by the most recently published phase diagram. Water quenching from 810 °C causes the β phase to partially transform to orthorhombic martensite (α), while furnace cooling yields secondaryaThe primary α formed isothermally remains unchanged in both cases. Subsequent aging causes transformation of the martensite to type 1aplus residual β, with a corresponding increase in strength and decrease in ductility. The maximum ductility (20 pct elongation) occurs in the water-quenched condition in which metastable β is retained. Analysis of the true stresstrue strain data suggests that transformation-induced plasticity may contribute to the enhanced ductility of the water-quenched material.