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一常规超塑性试验 1试样准备本工作所用的超塑性材料是根据美国空军和通用电器公司联合研制的用于宇航材料的Ti-17的合金成分再加入少量的Nb而获得的α+β型钛合金.其成分为:Ti-5Al-4Mo-4Cr-2Zr-2Sn和少量的Nb. 拉伸试样见图1,工作部分的直径φ=5mm,考虑到加热炉恒温区长度的限制,取标距为15mm即为试样工作部分直径的三倍. 2实验装置和实验条件本实验在WJ-10型机械性能试验机上进行,采用自制加热炉,炉内恒温区长200mm,用三支热电偶控温,温度误差小于2℃,试样夹具用φ30mm高温合金制成,因试验所加载荷较小,夹具的形变可以忽略,“p-l”曲线用x-y仪直接记录.
A conventional superplasticity test 1 Sample Preparation The superplastic material used in this work is based on the α + β type obtained by adding a small amount of Nb to the alloy composition of Ti-17 for aerospace materials jointly developed by USAF and General Electric Company Titanium alloy. Its composition is: Ti-5Al-4Mo-4Cr-2Zr-2Sn and a small amount of Nb. Tensile test shown in Figure 1, the working part of the diameter φ = 5mm, taking into account the length of the furnace temperature limit, The gauge length is 15mm which is three times the diameter of the working part of the sample.2 Experimental equipment and experimental conditions The experiment was carried out on a WJ-10 mechanical performance testing machine, using a homemade heating furnace, the furnace thermostatic zone length 200mm, with three thermoelectric Even control temperature, the temperature error is less than 2 ℃, the sample holder with φ30mm high temperature alloy made by the test load is small, fixture deformation can be ignored, “pl ” curve recorded directly with xy instrument.