孙前江,李宁,尹彬华

• 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:吉安职业技术学院

摘要(Abstract)：

对TA15合金在SANS CMT4104型高温电子拉伸实验机上进行恒应变速率超塑性拉伸试验,研究了合金超塑性变形过程中空洞演化及断裂行为。结果表明:超塑性变形过程中,TA15合金空洞含量和大小受变形量、应变速率和应变速率敏感性指数m值的影响较大。随变形量增大,空洞分别沿拉伸轴方向和垂直于拉伸轴方向发生了聚合和连接,空洞长大由形核时的一般扩散机制向塑性变形机制转变。TA15合金超塑性拉伸试样断口呈针点状,断口上含有大量的韧窝状空洞,空位聚集-空洞连接是TA15合金超塑性断裂的主要机制。

关键词(KeyWords)： TA15合金;超塑性;空洞;断口

Abstract:

Keywords:

基金项目(Foundation): 江西省自然科学基金资助(项目号20142BAB206021);; 江西省教育厅科技项目(GJJ150735);; 轻合金加工科学与技术国防重点学科实验室开放课题研究基金(gf201501006);; 南昌航空大学博士启动金资助(项目号EA201303356)

作者(Author): 孙前江,李宁,尹彬华

DOI: 10.13289/j.issn.1009-6264.2016.11.009

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