孙前江,王高潮,王志录

• 1:南昌航空大学轻合金加工科学与技术国防重点学科实验室
• 2:江西景航航空锻铸有限公司

摘要(Abstract)：

采用恒应变速率法研究了Ti-15-3合金的超塑性变形行为以及变形过程中的显微组织演化。结果表明,Ti-15-3合金在变形温度为750~850℃,应变速率为3.2×10-5~2.2×10-3s-1的条件下获得了较好的超塑性,并且温度为800℃,应变速率为3.2×10-4s-1时,最大伸长率达到了565%。在最佳变形条件下,试样变形区发生了明显的动态再结晶,有利于原始β晶粒进一步细化,超塑性得到较大程度地提高。但随着变形温度的升高和应变速率的降低,高温下变形时间大幅延长,再结晶的β晶粒聚集长大,导致显微组织发生显著粗化,超塑性能下降。超塑性拉伸后,Ti-15-3合金断口上的空洞体积分数较高且空洞之间相互连接,变形温度对空洞尺寸影响显著,空位聚集和空洞连接是Ti-15-3合金超塑性断裂的主要机理。

关键词(KeyWords)： Ti-15-3合金;超塑性;再结晶;组织演化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51075196,51164029);; 南昌航空大学轻合金加工科学与技术国防重点学科实验室基金(gf201101002);; 江西省教育厅科技项目(GJJ13498)

作者(Author): 孙前江,王高潮,王志录

DOI: 10.13289/j.issn.1009-6264.2013.11.016

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