Dynamite wear behavior of DME shape memory alloy 1 Xu Jiujun, Yan Li, Zhu Xinhe, Yan Zhijun, Yang Sheng 2, Yang Dazhi 31. Institute of Materials Processing, Dalian Maritime University, Dalian 6026, China; 2. Department of Mechanical Engineering, Dalian University of Technology, Dalian 6024, China; 3. Department of Materials Engineering, Dalian University of Technology, Dalian 6024, China Abstract The wear resistance of 150.944 mole fraction shape memory alloy was tested at a temperature of 7,1 and the ratio of sand to water was 0.2. The cumulative wear time was 301. The result showed that the alloy exhibited good resistance. Mill 14. Scanning electron microscope observed only slight wear. The pyramidal diamond indenter was used to simulate the contact between the sand particles and the specimen. Atomic force microscopy was used to quantitatively evaluate the indentation. Observed. 1 alloy indentation star. The obvious elastic deformation characteristics are reflected, which indicates that the material stress-strain nonlinear relationship and the pseudo-elastic deformation behavior have important contributions to the abrasion wear resistance of sand erosion. Advances have demonstrated the smart tribological properties of shape memory alloys. Key Division Shape Memory Alloys; Corrosion Wear; Sensitive Tribological Properties Category No. 1; 139.6 1 Gold is excellent in performance. More mature shape memory alloy outside 3017 3, abbreviated from. In the past, 16 gold studies were mainly focused on the shape memory effect. Fang Xian's excellent wear resistance was first proposed in 1982, 0, but no in-depth study was conducted. Jin Jialing 1 has studied the sliding wear performance of several near-atomic ratio alloys. The results show that the wear resistance of alloy 1 is better than that of nitriding, and the hardness of the alloy is higher under the high loading conditions of 1 and 0, 45 alloys. It is lower than these two kinds of materials; and it is considered that the heat treatment and high damping properties of the superelastic crystal structure are the main reasons why the alloy has excellent wear resistance. Wang Hongwei et al.2 systematically studied the dry wear properties of bath 1 shape memory alloys. It was considered that the shape memory effect and superelasticity changed the contact state, and the preferred orientation of martensite should be the passivation of induced martensite and the change of cracks. Therefore, 1 alloy 1 has a good lower wear performance, 1 is also right, a gold wear-resistant enamel has been studied. Similar conclusions have been drawn; from the recent, 14 studies have investigated the wear properties of 130 473 alloys. And its good wear resistance is attributed to the work hardening of the sub-layer and the formation of a finger mechanically hardened layer instead of super-elasticity. The literature 5.6 study is based on 102525. The abrasive wear performance of the two-body shape memory alloy is studied. Literature 7 shows that the iron-based shape memory alloy has good wear resistance under rolling friction conditions. Yes, shape memory media. Especially the 1 series alloy has good wear resistance. This article focuses on the 150.94 state mole fraction under the conditions of wear and tear of the smart 1 as the literature identification code 1 experiment selected D 50.94 and cement ball mill liner 13 steel as a material for the comparative test. The alloys were in the martensitic state, and the samples were all increased by 1 in 34.85. The boring bar was a mixture of water and sand, and the mass ratio of the sand to water was 2. This, the maximum wear rate. Consider the evaporation of moisture during the experiment. Every wear test was performed on a vertical universal friction wear tester. Two specimens were mounted symmetrically on the rotating disk, and the sand water mixture was placed in the sand village 1 and the specimen was immersed in the appropriate depth. The rotation speed is 48,1, the rotation radius is 32, and the experiment temperature is 70. At this time, the alloy 1 is in a super-elastic state. The sampling time interval was 2, 4, 6.8, and 10 were sampled 5 times in total, and the cumulative wear time was 30. Pyramid diamond indenter load 508 was pressed into the sample to simulate the contact state of the sand hook sample when impacted. Type 0 Milk Atomic Force Microscope Human Rain Measuring pressure 1! The three-dimensional topography was observed using a scanning electron microscope on the wear surface morphology. 2 Test results and analysis volume, the relationship between the curve from the slope of the curve can be seen that the wear rate of gold is far less than 13 steel, only 3 of the steel 19 This said 1 fund project National Natural Science Funded Project 599050, and China Bo + post-science fund The funded project Zhongbo 977-1 alloy also has good wear resistance under abrasive wear conditions, which is similar to the test results in the literature for sliding wear and abrasive wear conditions. It can be seen from the appearance 2 of the wear surface of the test specimen. 1; gold is very; micro-scratched, and the pit stripping layer and pits are few, showing a slight wear characteristics, indicating that high-stress scratches lead to wear, while the 13 steel surface has a clear texture and peel pit , Showed a more serious fatigue wear characteristics, indicating that the sample surface under the repeated impact of sand, a serious in the friction and wear test. Sand particles are stationary or move at a relatively low speed, and the sample moves at a high speed. It can be assumed that the typical contact state is that the sand particles collide with the sample surface with inertial force. Therefore, the pyramidal diamond indenter can be used to simulate the sharp corners of the sand with a constant pressure. Press into the sample surface. By observing the shape of the embossed pit, damage to the material caused by the impact of mortar and lining material on sand was investigated. Atomic force microscopy quantitatively observed the appearance of the pressure pits. 3. The indentation indentation of the 13 steel surface was star-shaped, showing obvious elastic deformation characteristics. When the fixed load was maintained, the contact surface between the indenter and the sample was the area, and the unloading was performed. After that, the contact surface is zone 5, the elastic zone between zone 3 and zone 5 and the 13 sample has no obvious elastic zone, only a distinct plastic zone appears, 34, especially the plastic zone of the 13 sample is 1 Alloy 1 and Zone 5 of the alloy, if converted into hardness index, ie when loaded, 1 D 1 alloy is softer than 3 steel, while unloaded, the intermediate gold is harder than 1.13 steel which means that when the sand impacts the sample face, ie the alloy It is also significantly better than 13 steel, so the alloy shows excellent wear resistance under the conditions of abrasive wear, only minor scratches, and 13 steel under the repeated impact of sand, resulting in fatigue off, and finally It is a serious wear. The underlying cause of the elastic deformation characteristics of the gold indentation is that the strain induced martensitic transformation and the martensite's 1 adjustment effect make the elastic deformation larger than the conventional material by 12 orders of magnitude, and the elastic nonlinearity The change of elastic modulus has a critical value. 4. When the external stress is lower than the critical value, the deformation behavior of the material is the same as that of the conventional metal material. When the external stress reaches the critical value of 9, the internal structure transformation begins to adapt. Stress-induced martensitic transformation and reorientation of martensite, that is, pseudoelasticity should also greatly reduce the elastic modulus, and the elasticity should be rapidly increased rapidly, added to this stage is the main part of elastic deformation super elasticity, can, Three people can sense the external stress. When the critical value is reached, the stiffness of the material changes greatly. When the external force is removed, the material returns to the original state. This constitutes a dual function of sensing and execution, that is, typical smart features. When the sharp corners of abrasive particles are in contact with the five pairs of mating pairs, the five-cubic person will exhibit sensitive tribological characteristics. The main mechanism is that when the 3Heren surface layer senses that the contact stress reaches a critical value, the order of the atoms inside the material is swiftly violated. Into the hall can be restored to current friction, the sub-interface contact with the real-time distribution. The friction and nucleation expansion of the frictional surface of the friction material will eventually decrease, and the local ploughing force on the opposite side of the sharp angle of the abrasive particle will be reduced, so that a good wear resistance will be exhibited; on the other hand, the real contact area will increase. No excessive thermal energy is generated due to mechanical deformation, and there is a fundamental difference between the process of contacting with gold and materials. 3 Conclusion Under the condition of sand erosion wear, the wear of the alloy is only 9% of that of 13 steel, showing good wear resistance. From scanning electronics! 1 The wear pattern observed by the micro-enthalpy can be seen on the 013 steel surface with a pronounced 1 dense fatigue pit. The 1 coat is relatively smooth. Only a small amount of scratches. Pyramidal diamond indenters were used to simulate the contact of sand particles with the sample surface. The shape of the crater can be observed by the original household force microscope. However, the crater of the 13 steel surface shows a more regular pyramid shape, whereas the crater of the 1 alloy shows a star shape. It shows that the pseudo-elasticity of the village material plays a role in the buffering and anti-friction of the bungee during the process of resisting abrasive grain pressure. Since the elastic deformability of the alloy is different from that of the ordinary metal, a special kind of sensitive tribological property is exhibited. Facilitate the scratch resistance of 1 alloy anti-sand erosion wear, called catalyzed. 1 review; brilliant. Melon, sex research. 1 along the 扪. Jin 1 melon 1 Xu Jiujun, 21 states; 1 Shan 1 Zhang Huichen, 1 Wang Gang, 3 State Department of Shape Memory Alloy Two-body Abrasive Wear Mechanism Study 1.1.10. 6 heart 7, Ding 6, 1 7 Journal of Dalian University of Technology, 1998366724 6 0.331 Du Yanliang, 31. 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