汽车车架用含钛镁合金的显微组织及力学性能研究

桂林; 李强军

doi:10.7513/j.issn.1004-7638.2021.05.030

汽车车架用含钛镁合金的显微组织及力学性能研究

doi: 10.7513/j.issn.1004-7638.2021.05.030

桂林^1,,
李强军²

1.
河南工业职业技术学院，河南南阳 473009
2.
河南大学材料学院，河南开封 475001

基金项目: 河南省科技攻关项目（142102310549）

详细信息

作者简介:
桂林（1983—），女，汉族，湖北随州人，讲师，硕士，研究方向：汽车检测及材料研究，E-mail：xingmu104029@163.com

中图分类号: TF823, TG146.22
计量
- 文章访问数: 209
- HTML全文浏览量: 40
- PDF下载量: 163
- 被引次数: 0
出版历程
- 收稿日期: 2020-08-10
- 刊出日期: 2021-10-30

Microstructure and mechanical properties of titanium magnesium alloy for automobile frame

Gui Lin^1
,,
Li Qiangjun²

1.
Henan Polytechnic Institute, Nanyang 473009, Henan, China
2.
School of Materials, Henan University, Kaifeng 475001, Henan, China

摘要

摘要: 研究了不同钛含量的汽车车架用含钛镁合金Mg-8Al-1Zn-xTi(x=0.05, 0.15, 0.3)的显微组织和力学性能，并对比了不含钛Mg-8Al-1Zn合金的显微组织和力学性能。结果表明：钛的添加，细化了合金晶粒，改善了合金力学性能。随钛含量增加，合金平均晶粒尺寸先减小后增大、力学性能先提高后下降。与不含钛Mg-8Al-1Zn合金相比，含钛Mg-8Al-1Zn-0.15Ti合金的平均晶粒尺寸减小7.2 μm、抗拉强度增大32 MPa、屈服强度增大33 MPa、断后伸长率增大3.8%，拉伸断裂方式从混合断裂变为塑性断裂。
- 镁合金 /
- 汽车车架 /
- Ti /
- 微合金化 /
- 显微组织 /
- 力学性能
Abstract: The microstructure and mechanical properties of Mg-8Al-1Zn-xTi(x=0.05,0.15,0.3) magnesium alloy containing titanium with different titanium contents were tested and analyzed, and the microstructure and mechanical properties of Mg-8Al-1Zn alloy without titanium were compared. The results show that the addition of alloy element Ti can refine the alloy grain and improve the mechanical properties of the alloy. The average grain size of the alloy first decreases and then increase, and the mechanical properties first improves and then declines. Compared with Mg-8Al-1Zn alloy without Ti, the average grain size of Mg-8Al-1Zn-0.15Ti alloy containing Ti decreases by 7.2 μm, tensile strength increases by 32 MPa, yield strength increases by 33 MPa, the elongation after fracture increases by 3.8%, and the tensile fracture mode changes from mixed fracture to plastic fracture.
- magnesium alloy /
- automobile frame /
- Ti /
- alloying /
- microstructure /
- mechanical property

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图 1 拉伸试样尺寸 (单位: mm)

Figure 1. Dimensions of tensile specimen

下载: 全尺寸图片幻灯片

图 2 合金试样的显微组织

Figure 2. Microstructures of the alloy samples

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图 3 合金试样拉伸断口SEM照片

Figure 3. SEM images of the tensile fracture for used alloys

下载: 全尺寸图片幻灯片

表 1 试验合金化学成分

Table 1. Chemical compositions of the testing alloys %

编号	Al	Zn	Ti	Si	Fe	Mg
试样1^#	8.021	0.995	0	0.010	0.004	Bal.
试样2^#	8.022	0.994	0.051	0.011	0.004	Bal.
试样3^#	8.024	0.996	0.148	0.011	0.005	Bal.
试样4^#	8.025	0.997	0.301	0.012	0.005	Bal.

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表 2 试验合金的平均晶粒尺寸

Table 2. Average grain size of the samples

编号	钛含量/%	平均晶粒尺寸/μm
试样1^#	0	16.4
试样2^#	0.05	14.6
试样3^#	0.15	9.2
试样4^#	0.3	11.4

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表 3 试验合金力学性能测试结果

Table 3. Test results of the mechanical properties of used alloys

编号	钛含量/%	抗拉强度/MPa	屈服强度/MPa	断后伸长率/%
试样1^#	0	366	257	7.4
试样2^#	0.05	371	261	7.7
试样3^#	0.15	398	290	11.2
试样4^#	0.3	382	273	11.8

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