董洪波,王高潮,曹春晓

• 1:南昌航空大学航空制造工程学院
• 2:北京航空材料研究院

摘要(Abstract)：

为了研究TC11(Ti-6.5Al-3.5Mo-1.5Zr-0.3Si)钛合金的超塑性变形行为,采用两种改锻工艺细化坯料原始组织,然后在电子拉伸试验机上分别以恒速、恒应变速率和最大m值法进行拉伸实验。结果表明,TC11钛合金在α+β区通过三维镦拔改锻工艺,可以获得晶粒度为6μm的细晶等轴组织,而在β区拔长改锻的组织为粗大的魏氏组织。在变形温度为900℃的条件下,TC11钛合金通过最大m值超塑变形方式获得了异常高的超塑性,最大伸长率达到2300%;而采用常规的恒应变速率和恒速超塑变形,伸长率分别为1147%和1100%。说明TC11钛合金在α+β区通过三维镦拔改锻细化晶粒后,以最大m值超塑变形是获得较好超塑性的有效方法。

关键词(KeyWords)： TC11钛合金;超塑性;最大m值超塑变形;变形工艺

Abstract:

Keywords:

基金项目(Foundation): 航空科学基金资助项目(05G56008)

作者(Author): 董洪波,王高潮,曹春晓

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