Compressive deformation and forging behavior of Ti14 alloy in semi-solid state
Compressive deformation and forging behavior of Ti14 alloy in semi-solid state
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DOI：
10.1016/j.msea.2009.05.003
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发表时间：
2009-09-15
期刊：
影响因子：
6.4
通讯作者：
Zhao, Y. Q.
中科院分区：
文献类型：
--
作者：
Chen, Y. N.;Wei, J. F.;Zhao, Y. Q.
通过在1223 ~ 1473 K温度范围内的压缩试验和在1223 ~ 1373 K温度范围内的锻造试验，研究了新型α + Ti 2Cu合金Ti 14的半固态变形行为和成形性能。还进行了锻造合金的拉伸试验，以研究锻造对机械性能的影响。结果表明，最大压应力与固相分数密切相关，在固相分数为0.94 ~ 0.98时（对应温度为1323 ~ 1373 K），压应力发生转变。这种转变与晶粒间固体桥数量的减少有关。在半固态锻造过程中，由于动态再结晶，获得了良好的成形性和晶粒细化。此外，拉伸试验表明，在超过1273 K的半固态锻造后，高的极限抗拉强度和屈服强度，这归因于半固态锻造引起的晶粒细化。通过改变锻造比也提高了塑性。这些结果表明，良好的成形性和拉伸性能可以同时获得在半固态压缩处理。(C)2009爱思唯尔有限公司版权所有。
Deformation behavior and formability of Ti14, a new typical alpha+Ti2Cu alloy in the semi-solid state, were investigated by compressive tests in temperature range between 1223 and 1473 K and by forging tests between 1223 and 1373 K. Tensile tests of the forged alloys were also performed to study the effect of forging on mechanical properties. The results show that the maximum compressive stress was greatly dependent on the fraction solid, and that a transition in stress occurred at a solid fraction between 0.94 and 0.98 (corresponding to the temperature between 1323 and 1373 K). This transition was related to the decrease in amount of solid bridges between grains. Excellent formability and grain refinement due to dynamic recrystallization were achieved during the semi-solid forging. Furthermore, tensile tests showed a high ultimate tensile strength and yield strength after semi-solid forging at more than 1273 K, which was attributed to the grain refinement caused by the semi-solid forging. Ductility was also improved by changing the forging ratio. These results indicate that both good formability and tensile properties can be simultaneously attained by the compressive processing in the semi-solid state. (C) 2009 Elsevier B.V. All rights reserved.