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| 时效温度对SCFs/AZ31B复合材料组织和性能的影响 |
| Effects of Aging Temperature on Microstructure and Properties of SCFs/AZ31 Composites |
| Received:August 02, 2021 |
| DOI：10.3969/j.issn.1674-6457.2022.02.010 |
| 中文关键词: AZ31B镁合金 短碳纤维 固相合成 时效处理 |
| 英文关键词: AZ31B magnesium alloy short carbon fiber solid phase synthesis aging treatment |
| 基金项目:国家自然科学基金(51704087);黑龙江省自然科学基金(LH2020E083) |
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| 中文摘要: |
| 目的 探究提高固相合成SCFs/AZ31B镁基复合材料力学性能的最佳时效温度。方法 采用固相合成工艺制备SCFs/AZ31B镁基复合材料并在415 ℃固溶处理20 h，然后分别在155，175，195，215 ℃下进行20 h时效处理。采用金相显微镜(OM)与扫描电镜(SEM)观察微观组织，并测试拉伸性能、硬度等力学性能，研究时效温度对显微组织及力学性能的影响。结果 时效过程中，碳纤维稳定存在于基体中。随着时效温度的升高，晶粒尺寸先增加后减小，175 ℃时效晶粒尺寸最小为14.84 μm，时效析出的第二相为Al2Mg。当时效时间为20 h、时效温度为175 ℃时，材料的屈服强度、抗拉强度、伸长率和维氏硬度最高，分别为188 MPa，259 MPa，6.9%，70.2HV。在该实验条件下，最佳时效温度为175 ℃。结论 随着时效温度的升高，第二相从非连续析出转为连续析出。时效处理可以改善材料的力学性能。 |
| 英文摘要: |
| The work aims to explore the best aging temperature to improve the mechanical properties of SCFs/AZ31B Mg-based composites prepared by solid state synthesis process. SCFs/AZ31B Mg-based composites were prepared by solid state synthesis process, and were solution treated at 415 ℃ for 20 h, then aged at 155, 175, 195, 215 ℃ for 20 h respectively. The microstructure was observed by metallographic microscope (OM) and scanning electron microscope (SEM). The mechanical properties such as tensile properties and hardness were tested to investigate the effects of aging temperature on microstructure and mechanical properties of SCFs/AZ31B Mg-based composites. During the aging process, carbon fibers stably existed in the matrix. With the increase of aging temperature, the grain size first increased and then decreased. The minimum grain size was 14.84 μm after aging at 175 ℃. The second phase precipitated during aging was Al2Mg. When aged at 175 ℃ for 20 h, the yield strength, tensile strength, elongation and vickers hardness of SCFs/AZ31B composites were the highest, which were 188 MPa, 259 MPa, 6.9% and 70.2HV, respectively. Under this experimental condition, the best aging temperature was 175 ℃. With the increase of aging temperature, the second phase changes from discontinuous precipitation to continuous precipitation. Aging treatment can improve the mechanical properties of materials. |
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