用TiB增强的老化硬化LM4单体复合材料的机械性质和断裂行为的比较研究
Srinivas Doddapaneni1, Sathyashankara Sharma1, Gowrishankar Mandya Chennegowda1
1Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, India.
Materials (Basel, Switzerland)
|June 10, 2023
概括
这项研究用TiB2和Si3N4陶粉增强了LM4复合材料,通过多阶段沉硬化和老化优化机械性能. 高度老化复合材料的硬度和UTS显著增加,表明性能有所改善.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 金工业是一种金工业.
背景情况:
- 在各种工程应用中,LM4合金复合材料至关重要.
- 通过陶增强来提高LM4的机械性能是一个活跃的研究领域.
- 优化热处理是释放金属矩阵复合材料全部潜力的关键.
研究的目的:
- 为了比较LM4复合材料的机械性能和断裂行为,这些复合材料用不同的TiB2和Si3N4.4%的重量强化.
- 研究单级和多级沉硬化处理 (SSHT和MSHT) 与人工老化对复合材料性能的影响.
- 为了确定最佳的加工参数,以提高机械性能.
主要方法:
- 用于单体复合材料制备的双阶段混合造.
- 应用SSHT和MSHT,然后在100°C和200°C进行人工老化.
- 机械性能测试 (硬度,最终拉伸强度 - UTS) 和断裂表面分析.
主要成果:
- 机械性能随着TiB2和Si3N4钢筋的重量增加而得到改善.
- 与100°C老化相结合的MSHT产生了最高的硬度和UTS值.
- 在高峰老化后,LM4 + 3重量%的TiB2复合材料的硬度增加了150%,UTS增加了68%.
- LM4 + 3重量%的Si3N4复合材料在峰值老化后,硬度增加了124%,UTS增加了54%.
- 断裂分析显示,在高峰时代的复合材料中,有一个主要的脆性模式.
结论:
- 多阶段沉硬化和老化显著提高LM4/TiB2和LM4/Si3N4复合材料的机械性能.
- 最佳的处理包括MSHT,然后在100°C时老化.
- 与不造的LM4相比,增强复合材料表现出优越的硬度和UTS,具有适用于苛刻应用的潜力.
- 了解骨折行为对于预测压力下的表现至关重要.
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