Si对原位自生镁基复合材料摩擦磨损性能的影响

采用原位法制备Mg2Si/AM60复合材料,研究了不同质量分数的Si粉对Mg2Si/AM60复合材料摩擦磨损性能的影响。结果表明,Si质量分数增加,复合材料硬度增加,其磨损量随之减小,磨损性能得到显著加强。外加载荷增大,复合材料磨损量持续增加。与基体AM60相比,Mg2Si/AM60复合材料有效推迟微量磨损向严重磨损转变的时间。     

摩擦参数对镁基复合材料磨损性能的影响

研究了采用原位法制备的Mg2Si/AM60复合材料的微观组织及其磨损性能.结果表明,该复合材料硬度增加,其磨损量随之减小,磨损性能得到显著加强；该复合材料的磨损量随外加载荷增大而持续增加,与基体相比,Mg2Si/AM60复合材料推迟了微量磨损向严重磨损的转变.     

润滑条件下Mg2B2O5/6061Al基复合材料摩擦磨损性能研究

采用自制的机械-超声混合搅拌设备制备出Mg2B2O5/6061Al铝基复合材料,复合材料的体积分数为2%。研究了载荷和滑动速度对基体以及复合材料的摩擦磨损性能的影响。实验结果表明,基体和复合材料摩擦系数总体上随着载荷和滑动速度的增加而减小。基体和复合材料的磨损率随载荷和滑动速度的增加而明显的增大,且基体和复合材料均存在一个临界载荷和临界滑动速度。当载荷和滑动速度到达临界值后,磨损率均急剧增大,此时试样摩擦磨损机制由微观疲劳磨损和磨粒磨损向粘着磨损与剥离磨损转变。     

原位生成AlN颗粒增强镁基复合材料组织及摩擦磨损研究

采用原位反应合成法,制备AlN颗粒增强镁基复合材料.利用X射线衍射、扫描电镜、能谱等手段对其相组成、显微组织以及摩擦磨损性能进行研究.结果表明,在Mg-Al-N体系中原位反应生成AlN颗粒,制备AlN增强镁基复合材料是完全可行的,随着加入Mg3N2质量分数的增加,生成AlN颗粒的增多,基体α相变得细小,复合材料的抗摩擦磨损性能得到显著提高,由AZ91基体的粘着磨损逐渐转变为AlN/AZ91复合材料的磨粒磨损.     

硼酸镁晶须增强6061铝基复合材料的干摩擦磨损行为(英文)

研究搅拌铸造工艺制备的硼酸镁晶须增强6061铝基复合材料在干滑动条件下的摩擦磨损性能。复合材料的体积分数为2%,根据增强体种类,材料分别记为:Al基体、Mg2B2O5w/6061Al、ZnO/Mg2B2O5w/6061Al和CuO/Mg2B2O5w/6061Al;讨论磨损速率和摩擦因数之间的关系。结果表明:在4种材料中,ZnO/Mg2B2O5w/6061Al复合材料的磨损率最低。随着载荷和滑动速度的增大,基体和复合材料的摩擦因数和磨损率降低,摩擦磨损机制由轻微磨损机制转向严重磨损机制。     

粉末热挤压制备Mg_2B_2O_5/6061Al复合材料的摩擦磨损性能研究

采用粉末热挤压工艺制备硼酸镁晶须增强铝基复合材料,研究了晶须含量和载荷的变化对材料摩擦磨损性能的影响。结果表明,在恒定的速度和载荷下,硼酸镁晶须体积含量为2%时耐磨性最好,其磨损率为纯6061铝合金磨损率的62%。随着载荷的增大,复合材料的磨损率增加,并且高体积含量的复合材料磨损率呈现出更大的增加趋势。磨损表面分析表明:在较低负载下,6061铝合金的磨损机制以磨粒磨损为主,复合材料的磨损机制以轻微的粘着磨损为主;在较高负载时,6061铝合金和复合材料的磨损机制均由粘着磨损和磨粒磨损共同主导。     

涂覆及未涂覆Mg_2B_2O_(5w)晶须的6061Al合金干摩擦行为研究

制备了未涂覆、涂覆Cu O和涂覆Zn O的硼酸镁晶须(Mg2B2O5w)增强的6061Al铝基复合材料,研究了外加载荷和滑动速度对6061Al合金以及复合材料的摩擦磨损性能的影响。结果表明,在相同条件下,涂覆Zn O涂层、Cu O涂层、未涂层晶须增强的铝基复合材料和6061Al合金磨损率依次增大;随着载荷和滑动速度的增加,6061Al合金和复合材料的摩擦系数均有下降的趋势,磨损率随之减小。     

原位合成Al2O3增强铝基复合材料的摩擦磨损性能

通过采用粉末冶金和原位合成技术相结合的近净成形技术制备Al-5％Si-Al2O3复合材料,并运用M一2000摩擦磨损试验机对该复合材料的摩擦磨损性能进行研究。通过单一变量比较法分析载荷和滑动速度对Al-5％Si-Al2O3复合材料摩擦磨损性能的影响,同时对长时间连续磨损下该材料的摩擦性能进行研究。通过扫描电子显微镜对Al-5％Si-Al2O3复合材料的磨损表面进行观察,并分析其磨损机制。结果表明,随着载荷的增大,试样的磨损量和摩擦因数均增加;随着滑动速度的增大,试样表面的升温使得产生氧化层的速率增加,试样的磨损量和摩擦因数均减少。在长时间的连续磨损过程中,由于初始时发生粘着磨损,试样的摩擦因数随着滑动距离的增大而增大。然后,试样表面氧化层的形成和破坏趋于动态平衡,试样表面相对稳定,其摩擦因数也随之趋于平稳。铝基复合材料的磨损机制主要为磨粒磨损、粘着磨损和氧化磨损。     

Al3Ti／Mg复合材料磨损行为的研究

研究了原位反应烧结法制备的Al3Ti/Mg复合材料的磨损行为,并且与纯镁和AZ91镁合金进行了比较.结果表明,原位内生Al3Ti颗粒能有效地增强镁基体,Al3Ti/Mg复合材料的耐磨性比纯镁和AZ91镁合金有明显的提高,且随Al3Ti颗粒增强相体积分数的增加,复合材料的耐磨性呈现上升的趋势;磨损表面的微观形貌显示,Al3Ti颗粒均匀分布在镁基体内部,且与基体结合牢固,起到了承担载荷和推迟复合材料磨损的作用.     

载荷和滑动速度对块体镁基非晶合金干摩擦性能的影响

目的以制备的Mg_(59.5)Cu_(22.9)Ag_(6.6)Gd_(11)块体镁基非晶合金为基础,探索法向载荷和滑动速度影响镁基非晶合金干摩擦行为的规律和机制,为进一步研究镁基非晶合金提供实验依据。方法采用UMT-2多功能摩擦磨损机,改变法向载荷和滑动速度的大小,进行摩擦磨损实验。通过白光干涉轮廓仪测出磨损轨迹的宽度和深度,再根据公式计算出磨损体积和磨损率。利用扫描电镜和EDS能谱分析磨损轨迹,揭示非晶合金的磨损机制。结果随着载荷的增加,磨损率先减小后稳定,摩擦系数略有减小。随着滑动速度的增加,磨损率先减小后增大,在相对滑动速度为120 mm/s时出现最小值。载荷小于20 N时,磨痕表面布满犁沟和小颗粒状磨屑;载荷大于20 N时,磨痕表面出现层叠状非均匀塑性变形层,对磨球表面转移膜粘连明显。滑动速度低时,磨痕表面布满犁沟,随着速度的增加,先是软化均匀流变,接着出现熔化、剥落。结论块体非晶镁基合金在低载荷下以磨粒磨损为主,还伴随着氧化、少量的粘着;载荷大于20 N时,变为粘着磨损为主。低滑动速度下以磨粒磨损为主,当滑动速度为180 mm/s时,试样表面熔化失效,磨损方式为剥落和磨粒磨损的综合。     

The abrasive wear properties of Al-Mg-Si3N4 metal matrix composites

One kind of three-dimensional network structure, reinforced aluminum magnesium matrix composites, has been prepared by pressure-assisted and vacuum-driven infiltration technology. The composites interpenetrated with ceramic have higher wear resistance than the metal matrix owing to their special topology structure. The reinforcement volume fraction has a large effect on abrasive wear. The wear rate decreases with the increase of the volume fraction of reinforcement and increases with the increase of sliding time and applied load. The wear mechanism of the composites (abrasive wear) differs greatly from the matrix alloy (adhesive wear).     

Mg-11Y-5Gd-2Zn镁合金干滑动的摩擦磨损行为

采用往复式摩擦磨损试验机对铸态和T6态Mg-11Y-5Gd-2Zn合金进行干摩擦磨损试验,研究载荷（3~15N）、磨擦速度（0.03~0.24m/s）、摩擦温度（25~200 °C）对合金磨损率的影响,并通过扫描电镜观察合金磨损表面形貌和磨屑。结果表明：随着载荷的增加,合金的磨损率几乎呈线性增加;随着摩擦速率的增加,合金的磨损率降低;铸态合金的磨损率高于T6态合金的。Mg-11Y-5Gd-2Zn合金中的Mg12Y1Zn1相、表面氧化相和残留的磨屑影响合金的磨损率。在本试验条件下,磨损机制主要是粘着磨损和塑性变形。     

Dry wear behavior of rheo-casting Al–16Si–4Cu–0.5Mg alloy

Dry wear behavior of the rheo-casting Al–16Si–4Cu–0.5Mg alloy was investigated by micro-scratch and dry sliding wear tests. Analyses of the microstructure, scratch grooves, wear tracks, worn surfaces and wear debris of the alloy were carried out by optical microscope and scanning electron microscope. The microstructural analysis showed that via rheo-processing, the primary Si was refined and rounded, eutectics dispersed more homogenously, and even the skeleton AlFeMnSi phase was fragmented into facet shape. Micro-scratch test showed that the microstructural refinement resulted in better wear resistance. Dry sliding wear test revealed that the rheo-processed sample exhibit obviously superior wear resistance because of the microstructure improvement. The dominant mechanism in mild wear condition is abrasion, but it turned to adhesion and oxidation in high applied load and fast sliding velocity conditions.     

Effect of Bagasse ash reinforcement on the wear behaviour of Al-Cu-Mg/Bagasse ash particulate composites

The effect of Bagasse ash (BAp) particle reinforcement on the wear behavior of Al-Cu-Mg alloy has been studied.  Bagasse ash particles were varied from 0 wt pct-10 wt pct with interval of 2 wt pct. Unlubricated pin-on disc tests were conducted to examine the wear behaviour of the aluminium alloy/Bagasse ash particulate composites. The tests were conducted at varying loads, from 5 to 20 N and sliding speeds of 1.26 m/s, 2.51 m/s , 3.77 m/s and 5.02 m/s for a constant sliding distance of 5000 m. The results showed that the wear rates of the Al-Cu-Mg/BAp composites are lower than that of the matrix alloy and further decrease with increasing Bagasse ash content. Wear rate increases as the sliding speed and applied load increase. The microstructure of the worn surface revealed that a large amount of plastic deformation appeared on the surface of the unreinforced alloy. While Bagasse ash reinforced Al-Cu-Mg alloy showed worn out surface that is not smooth, and grooves, scratches and parallel lines were observed. A combination of adhesion and delamination wear was in operation. These results show that improve wear properties is achievable for the aluminium alloy by the addition of Bagasse ash particles as reinforcement material.     

T6态Al-10Si-5Cu-0.75Mg合金干滑动摩擦磨损性能的研究

利用UMT-2 型摩擦磨损试验机研究了T6态Al-10Si-5Cu-0.75Mg 合金的干滑动摩擦磨损性能,采取SEM、XRD、EDS等方法分析了合金在不同转速和载荷下的摩擦磨损行为。结果表明：合金的磨损率随转速和载荷的增加而增大,但在800 r/min的高转速下仍具有良好的耐磨性,15N高载荷时的磨损率相对于5N低载荷时只增加了291%,属于轻微磨损;摩擦系数的平均值在0.35-0.40范围内变化,且随时间的变化不大,具有较高的稳定性;另外,磨损机制由低速轻载时的磨粒磨损、粘着磨损向高速重载时的剥层磨损、氧化磨损转变。     

AZ71E镁合金的高温摩擦学行为(英文)

用销-盘摩擦磨损试验机考察 Z71E压铸镁合金在载荷为10~50 N时的高温摩擦学行为,利用光学显微镜(OM)和扫描电镜(SEM)对磨损表面和亚表面进行分析,通过光学显微镜(OM)、X射线衍射仪(XRD)、差示热扫描(DSC)等对AZ71E合金的高温微观结构、热稳定性和力学性能进行研究。结果表明:随着载荷和滑动距离的增加磨损率增大,而摩擦系数则随着载荷的增加而减少。在低载荷时,AZ71E镁合金的磨损机制主要是磨粒磨损;在150℃和高载荷下,粘着磨损和轻微的剥层磨损是主要的磨损机制;而在200℃及高载荷下,镁合金的主要磨损机制是严重的剥层磨损和熔融磨损。AZ71E镁合金的高温摩擦学性能提高的内在机制是AZ71E镁合金中第二相Al11Ce3使镁合金的高温拉伸和延展性能显著提高。     

二硼化钛对Al2024−TiB2非原位复合材料摩擦磨损性能的影响

用搅拌铸造法制备不同质量分数二硼化钛(TiB2)颗粒增强的铝基复合材料,并研究其摩擦磨损性能.采用销?盘式摩擦试验机对Al2024?TiB2复合材料进行干滑动磨损试验.为了研究摩擦学参数对复合材料的影响,对载荷、滑动距离和滑动速度等参数进行调整.显微组织表征结果表明,TiB2颗粒分散均匀并与基体有良好的结合.实验结果表...     

Dry sliding wear behavior of Al 2219/SiCp-Gr hybrid metal matrix composites

The dry sliding wear behavior of Al 2219 alloy and Al 2219/SiCp/Gr hybrid composites are investigated under similar conditions. The composites are fabricated using the liquid metallurgy technique. The dry sliding wear test is carried out for sliding speeds up to 6 m/s and for normal loads up to 60 N using a pin on disc apparatus. It is found that the addition of SiCp and graphite reinforcements increases the wear resistance of the composites. The wear rate decreases with the increase in SiCp reinforcement content. As speed increases, the wear rate decreases initially and then increases. The wear rate increases with the increase in load. Scanning electron microscopy micrographs of the worn surface are used to predict the nature of the wear mechanism. Abrasion is the principle wear mechanism for the composites at low sliding speeds and loads. At higher loads, the wear mechanism changes to delamination.