Constitutive relationship analysis and microstructural evolution of biomedical Ni-Ti alloy during warm deformation
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摘要: 为研究医用镍钛合金的温变形行为，利用Gleeble-3800 热模拟试验机对其进行压缩试验，获得了合金压缩过程的真应力-真应变曲线，分析了合金在变形过程中的本构关系和微观组织演变过程，并建立了加工图，确定出较好的加工参数。结果表明，动态回复和再结晶是压缩变形过程中主要的软化机制，当30≤lnZ≤42时，合金发生动态回复，当23≤lnZ≤26时，合金发生动态再结晶。根据合金微观组织分析结果及热加工图，合金在较低应变速率和较高温度下变形时具有良好的塑性变形能力和细小的再结晶组织，合金较好的两个变形工艺参数区域为：区域1为变形温度935～1045 K，应变速率0.001～0.004 s−1；区域2为变形温度1045～1073 K，应变速率0.003～0.03 s−1。Abstract: In order to study warm deformation behavior of the biomedical Ni-Ti alloy, compression tests were performed on a Gleeble-3800 thermal simulator. The true stress-true strain curves were obtained. The constitutive relationship and microstructures evolution during the deformation were analyzed. The processing map was established and optimum parameters for warm deformation were determined. The results show that dynamic recovery and recrystallization are the main softening mechanism during compression. Dynamic recovery occurs when 30≤lnZ≤42 and recrystallization occurs when 23≤lnZ≤26. According to the microstructural analysis and processing map, the alloy shows better workability and fine recrystallized microstructures at low strain rates and high deformation temperatures. And the optimum deformation parameters of the alloy were determined as follows: domain 1 occurs in the temperature range of 935-1 045 K and the strain rate range of 0.001-0.004 s−1, and domain 2 occurs in the deformation temperature range of 1 045-1 073 K and strain rate range of 0.003-0.03 s−1.
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图 1 镍钛合金压缩变形真应力-真应变曲线
Figure 1. True stress-true strain curves of Ni-Ti alloy obtained by compression tests
图 2 热压缩过程中变形参数之间的关系曲线
Figure 2. Relationships among deformation parameters during hot compression
图 9 镍钛合金在不同应变下的加工图
Figure 9. Processing maps of the Ni-Ti alloy under different strains
表 1 镍钛合金的化学成分
Table 1. Chemical compositions of the Ni-Ti alloy
% Ni C N O Ti 55.99 0.009 <0.003 0.032 余量 
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