孙子强,肖柱,李翰冬,张玉芳,贾延琳,甘雪萍

• 1:中南大学材料科学与工程学院
• 2:中南大学粉末冶金研究院

摘要(Abstract)：

通过ProCAST软件模拟了定向凝固温度场分布，优化了定向凝固工艺，制备了?13 mm Cu-15Ni-8Sn合金棒材。首先对合金进行固溶处理，随后进行冷拉拔变形及时效处理。采用光学显微镜、透射电镜、显微硬度仪和力学试验机等研究了合金经不同工艺处理后的组织和性能。结果表明：固溶态棒材经65%冷拉拔变形后，硬度从121 HV上升到了285 HV,平均晶粒尺寸由15.7μm下降到0.94μm。变形态合金组织呈纤维状，形成较强的<111>//X_0方向的丝织构；变形态合金线材在380℃时效过程中，先发生调幅分解，然后析出DO_(22)有序相，60 min时合金硬度达到峰值399 HV,抗拉强度为1446 MPa;时效时间继续延长，进入过时效态，开始析出长条状不连续析出相(DO_3相),其长大形成层片状结构，导致合金性能急剧下降。

关键词(KeyWords)： Cu-15Ni-8Sn合金;定向凝固;力学性能;冷拉拔

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2021YFB3700700);; 国家自然科学基金(52071342)

作者(Author): 孙子强,肖柱,李翰冬,张玉芳,贾延琳,甘雪萍

DOI: 10.13289/j.issn.1009-6264.2024-0174

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