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摘要：
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为研究和验证Ti2AlNb合金的超塑成形性能，对其热物性能进行了测试，得到Ti2AlNb合金常温和高温下的热导率、比热容和热膨胀系数；结合热物性能测试结果，采用MSC.MARC软件对航空典型尺寸的2层Ti2AlNb合金结构件进行超塑成形/扩散连接（SPF/DB）工艺模拟，对其成形后的厚度变化和应力分布进行分析；采用超塑成形/扩散连接工艺成功制备出航空典型尺寸的2层Ti2AlNb合金结构件，并对其关键部位厚度、扩散连接区域金相及扩散连接区域强度进行分析和测定。试验结果表明：在成形温度为970 ℃、应变速率为3×10-4 s-1的条件下，可以实现2层Ti2AlNb合金结构件的制备，且结构件成形质量好，满足航空工程制造要求，试验结果与模拟仿真结果吻合。
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In order to study and verify the superplastic forming properties of Ti2AlNb alloy, the thermal properties of Ti2AlNb alloy were tested, and the thermal conductivity, specific heat capacity and thermal expansion coefficient of Ti2AlNb alloy at room temperature and high temperature were obtained. Combined with the test results of thermal properties, the superplastic forming/diffusion bonding（SPF/DB）process of two-layer Ti2AlNb alloy structural parts with typical aeronautical dimensions was simulated by MSC.MARC software, and the thickness change and stress distribution after forming were analyzed. Then, the two-layer Ti2AlNb alloy structural parts with typical aeronautical dimensions were successfully fabricated by SPF/DB process, and the thickness of key positions, the metallographic structure and strength of diffusion bonding area were analyzed and measured. The test results show that the two-layer Ti2AlNb alloy structure parts can be fabricated at the forming temperature of 970 ℃ and the strain rate of 3×10-4 s-1, and the forming quality of structural parts is good to meet the requirements of aeronautical engineering manufacturing. Thus, the test results are in good agreement with the simulation results.
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基金项目：
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国家自然科学基金资助项目（5187122）
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作者简介：
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王珏（1986-），男，硕士，高级工程师，E-mail：wangjue_wangjue@126.com
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参考文献：
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