摘要：不断发展的微电机系统对微型零件包括疲劳性能在内的服役性能要求越来越高。采 用塑性成形方法制备带有连续纤维组织的零件以提高疲劳寿命的方法，已在工业界得到 认可与应用。在课题组前期制备 QAl7 铜合金微型平面弹簧的基础上，本文探究了固溶处 理和轧制工艺相结合的方式对高强度的 QAl7 铝青铜合金的微观组织变化规律、力学性能 的影响。结果表明，QAl7 铝青铜合金最佳固溶处理工艺为 800℃+5h。在此工艺下，合金 的延伸率达到了 22.8%，较处理前提高了 102%。轧制实验中合金的最高下压量达 50%， 具有平行于轧制方向的{110}<101>织构，微观组织为连续的纤维状分布。

关键词 QAl7 铝青铜 固溶处理 轧制 微观组织

毕 业 设 计 说 明 书 外 文 摘 要

Title      Microstructure Control and Tensile Properties  of Aluminum Bronze Alloy

Abstract：With the MEMS technology is widely used in all walks of life, its market size is rapidly expanding. Micro-mechanical electronic system is a combination of various miniature parts, so the key to the development of MEMS technology is micro-part preparation technology. The fatigue life of parts with continuous fiber structure formed by plastic forming has been recognized and applied by industry. For example, the bending fatigue life of precision forging gear with uniform and continuous distribution of fiber structure is obviously higher than that of cutting gear. Therefore, this paper proposed the use of high strength QAl7 copper alloy as the experimental material to study the mechanical properties, process parameters, microstructure and mechanical properties of QAl7 copper alloy at different room temperature, and obtain the Cu-Al alloy with fiber structure, which is expected to improve the microstructure Spring fatigue life. The optimum solution treatment rate of aluminum bronze alloy was found to be 800 ℃ + 5h, and the elongation of the alloy reached 22.8%. The maximum amount of alloy in the rolling experiment is 50%, and it has continuous fibrous structure and has {110}texture. 

Keywords  QAl7 copper alloy；microstructure ；micro-spring ；heat treatment

目 次

1 引言 1

1.1 MEMS 技术简介 1

1.2 平面微弹簧简介 2

1.3 铝青铜简介及其优势 3

1.4 研究意义及内容 7

2 实验材料及方法 9

2.1 实验流程及材料 9

2.2 实验设备 9

2.3 热处理工艺 10

2.4 微观组织观察 10

2.5 力学性能测试 11

2.6 轧制实验 12

3 固溶处理对 QAl7 铝青铜合金组织和力学性能的影响 14

3.1 固溶处理对 QAl7 铝青铜合金组织与相的影响