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摘要：本论文对ZK60镁合金在330℃～370℃温度范围内进行了不同道次的多向锻造，介绍了多向锻造的工艺原理和影响因素。采取了不同温度的退火和固溶时效处理，对镁合金常用热处理方式作了相应介绍。采用光学显微镜研究了ZK60镁合金多向锻造前后以及不同热处理条件下的显微组织变化，使用硬度计对多向锻造以及热处理前后的力学性能进行了测试，从而探索该合金的组织与性能随着多向锻造以及热处理条件变化的趋势。退火处理会降低多向锻造ZK60镁合金的硬度，均匀化合金组织。随着固溶时效处理温度的提高，多向锻造后的合金硬度会逐渐降低，β相向基体中溶解。
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关键词：多向锻造, ZK60,镁合金,力学性能,组织7070
毕业设计说明书（论文）外文摘要
Title： Effects of Heat Treatment and Multi-direction Forging on
Microstructures and Properties of ZK60 magnesium alloy
Abstract
In this paper, ZK60 magnesium alloy was deformed by multi-direction forging at the temperature of 330℃～370℃ for different passes. The theory and factors of muti-direction forging were introduced. After multi-direction forging, annealing and solution together with aging treatment were also performed on the alloy. The general heat treatment of magnesium alloys was discussed. Optical microscopy (OM) was used to study the microstructures under different forging and heat treatment conditions, hardness tester was adopted to check the mechanical properties before and after the multi-direction forging. The microstructures and mechanical properties of ZK60 magenisum alloys with the change of multi-direction forging and heat treatment conditions were investigated to provide regular reference for the further study. The annealing process will reduce the hardness of the multi-directional forging ZK60 magnesium alloy, with the homogenization of the alloy approved. As the solution and aging treatment temperature increased, the hardness of alloy decreased and β-phase dissolved to the base.
Keywords
multi-direction forging, ZK60 magnesium alloys, properties, microstructure
目录
1 引言 1
1.2 多向锻造技术(Multi-direction Forging) 1
1.2.1 多向锻造原理 1
1.2.2 多向锻造晶粒细化机制 3
1.2.3 多向锻造影响因素 4
1.3 镁合金的热处理方式 4
1.3.1 退火 4
1.3.2 固溶处理 5
1.3.3 人工时效 5
1.3.4 氢化处理[23,24] 5
1.4 镁合金强化 5
1.4.1 固溶强化 5
1.4.2 析出强化 5
1.4.3 弥散强化 6
1.4.4 细晶强化 6
1.5多向锻造法细化镁合金应用前景与展望 7
2 试验材料和实验方案 7
2. 1 试验材料 7
2.2 实验方案 8
2.2.1 ZK60镁合金的多向锻造 8
2.2.2 ZK60镁合金的热处理 10
2.2.3 金相组织观察 10
2.2.3 硬度测试 11
3 热处理对多向锻造ZK60镁合金组织与硬度的影响 11
3.1 退火处理对多向锻造ZK60镁合金组织的影响 11
3.2 固溶时效对多向锻造ZK60镁合金组织的影响 13
3.2.1 固溶处理对多向锻造ZK60镁合金组织的影响 14
3.2.2 时效处理对多向锻造ZK60镁合金组织的影响 15
3.3 退火处理对多向锻造ZK60镁合金硬度的影响 16
3.4 固溶时效对多向锻造ZK60镁合金硬度的影响 17