摘 要本文主要是研究热处理对钛基复合材料(TMCs)的组织和性能的影响。通过 对 5vol。% (TiC+TiB )/Ti-6Al-4v 试样进行不同热处理，研究了热处理后 TMCs 的 组织和性能变化。主要是对其进行淬火处理、不同时间或不同温度回火处理和盐 浴处理。通过上述的热处理，利用扫描电镜观察其组织结构，利用显微硬度计测 得其硬度变化，利用拉伸试验机分析不同热处理后力学性能的变化。从上面观察 的组织结构以及力学性能的变化，从而初步分析不同的热处理方式对钛基复合材 料组织与性能的影响。研究结果显示：经过不同热处理后，试样内组织发生改变， 主要有马氏体分解和 α 相析出；材料硬度和强度有着先升后降的趋势；断裂方式 是脆性断裂，但断面断裂是由解理断裂和韧窝断裂共存的混合型断裂，且解理断 裂是主要断裂方式。79146

毕业论文关键字：钛基复合材料；热处理；组织；性能

Abstract The effect of heat treatment on the microstructure and properties of titanium matrix composites (TMCs) was studied in this paper。 The microstructure and properties of 5vol。% (TiC+TiB) /Ti-6Al-4v samples were studied by different heat treatment, and the changes of TMCs after heat treatment were studied。 The main sample was subjected to quenching treatment, different time or different tempering temperature and salt bath treatment。 Through the heat treatment, the microstructure of the heat treatment was observed by scanning electron microscope, and the change of hardness was measured by the micro hardness tester。 The mechanical properties of different heat treatment were analyzed by the tensile testing machine。 The effect of different heat treatment on microstructure and mechanical properties of titanium matrix composites was analyzed by observing the microstructure and mechanical properties of the composite。 The results showed that: after different heat treatment, the microstructure of the samples changed, such as the martensite decomposition and the alpha phase precipitation; hardness and strength have the trend of first increased and then decreased; fracture is brittle fracture but fracture is by cleavage fracture and dimple fracture of coexisting of mixed mode fracture and cleavage fracture is the main fracture mode。

Keywords: Titanium matrix composite; Heat treatment; Microstructure; Property

目 录

第一章 绪论 1

1。1 引言 1

1。2 钛基复合材料制备工艺 1

1。2。1 国内钛基复合材料制备工艺 1

1。2。2 国外钛基复合材料制备工艺 2

1。3 钛合金的种类 2

1。3。1 α 钛合金 3

1。3。2 α+β 钛合金 3

1。3。3 β 钛合金 4

1。4 热处理工艺 5

1。4。1 退火处理 6

1。4。2 固溶处理和时效处理 7

1。5 钛合金固态相变 8

1。5。1 马氏体转变 8

1。5。2ω 相的形成 8

1。6 本课题研究的目的与意义 9

第二章 实验材料与内容 10

2。1 实验材料与设备 10

2。1。1 试验材料