B. Babalola, Rudzani Nengwekhulu, O. Ayodele, Boitumelo Charmaine Mashabela, P. Olubambi
In this study, the phase formation, microstructure and microhardness of nickel-based superalloy fabricated using a spark plasma sintering technique were evaluated. The microstructure and microhardness of the nickel-based superalloy were explored at diverse sintering temperatures (600 °C - 1050 °C). The phase formations and volume fraction with respect to temperature were predicted by using CALPHAD-based software. The microstructure, phase constitution, and microhardness were evaluated via scanning electron microscope (SEM), X-ray diffraction (XRD), and Vickers hardness tester. The findings indicated that the spark plasma sintering technique enables the development and growth of the necking of particles, enhancing elemental bonding and alloy densification as the temperature increases. The hardness value increases at increasing temperatures, with a maximum value of 353 HV attained at a temperature of 1050 °C.
本研究评估了采用火花等离子烧结技术制造的镍基超级合金的相形成、微观结构和显微硬度。在不同的烧结温度（600 °C - 1050 °C）下，对镍基超合金的微观结构和显微硬度进行了研究。使用基于 CALPHAD 的软件预测了相的形成和随温度变化的体积分数。通过扫描电子显微镜 (SEM)、X 射线衍射 (XRD) 和维氏硬度计对微观结构、相组成和显微硬度进行了评估。研究结果表明，随着温度的升高，火花等离子烧结技术能使颗粒颈部发展壮大，增强元素结合和合金致密化。硬度值随温度升高而增加，在温度为 1050 °C 时达到最大值 353 HV。
{"title":"Phase Prediction, Microstructure, and Microhardness of Sintered Nickel-Based Superalloy","authors":"B. Babalola, Rudzani Nengwekhulu, O. Ayodele, Boitumelo Charmaine Mashabela, P. Olubambi","doi":"10.4028/p-es8wsb","DOIUrl":"https://doi.org/10.4028/p-es8wsb","url":null,"abstract":"In this study, the phase formation, microstructure and microhardness of nickel-based superalloy fabricated using a spark plasma sintering technique were evaluated. The microstructure and microhardness of the nickel-based superalloy were explored at diverse sintering temperatures (600 °C - 1050 °C). The phase formations and volume fraction with respect to temperature were predicted by using CALPHAD-based software. The microstructure, phase constitution, and microhardness were evaluated via scanning electron microscope (SEM), X-ray diffraction (XRD), and Vickers hardness tester. The findings indicated that the spark plasma sintering technique enables the development and growth of the necking of particles, enhancing elemental bonding and alloy densification as the temperature increases. The hardness value increases at increasing temperatures, with a maximum value of 353 HV attained at a temperature of 1050 °C.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"19 s1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140264146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Azeez, S. Akande, S. Afolalu, A. Adetunla, Bernard Adaramola
Magnesium aluminium of the magnesium-alloy variety have long been extensively utilized in different technical applications and are still capturing the attention of researchers because of their cost-effectiveness and lightness. Grain fractal sizes, microstructural relationships, and sphericity, as well as their relationship with service performance, were discovered for numerous frequently employed Mg-Al alloys. As a result, the influence of cow’s bone extracts calcium on the mechanical behaviours as well as microstructure of Magnesium aluminium alloy was investigated in this work. Calcium (0.5% weight) concentration, formations with uniform and non-uniform grain boundaries led to alloy hardening. 286.537MPa and 57.3 HB are respectively the highest tensile strength and hardness gotten.
{"title":"The Influence of Cow’s Bone Calcium Concentration on the Mechanical Characteristics of a Mg-Al Alloy","authors":"T. Azeez, S. Akande, S. Afolalu, A. Adetunla, Bernard Adaramola","doi":"10.4028/p-jjia46","DOIUrl":"https://doi.org/10.4028/p-jjia46","url":null,"abstract":"Magnesium aluminium of the magnesium-alloy variety have long been extensively utilized in different technical applications and are still capturing the attention of researchers because of their cost-effectiveness and lightness. Grain fractal sizes, microstructural relationships, and sphericity, as well as their relationship with service performance, were discovered for numerous frequently employed Mg-Al alloys. As a result, the influence of cow’s bone extracts calcium on the mechanical behaviours as well as microstructure of Magnesium aluminium alloy was investigated in this work. Calcium (0.5% weight) concentration, formations with uniform and non-uniform grain boundaries led to alloy hardening. 286.537MPa and 57.3 HB are respectively the highest tensile strength and hardness gotten.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140264751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. M. Yusuf, Nur Hidayah Musa, N. Mazlan, Nong Gao
Severe plastic deformation (SPD) processes, particularly high-pressure torsion (HPT) have been increasingly applied to metallic specimens fabricated by laser powder bed fusion (L-PBF) additive manufacturing (AM) for enhancing their mechanical and functional properties through nanoscale grain refinement (≤ 100 nm). In this study. L-PBF AM-fabricated Inconel 718 (IN 718) specimens are initially subjected to 10 HPT revolutions to produce nanosized grains. Subsequently, microstructural characterisation, as well as hardness and electrochemical tests are conducted to evaluate the evolution of microstructures, hardness, and corrosion performance of the as-received and HPT-processed specimens by using various microscopy, Vickers microhardness (HV) measurements, and corrosion performance, respectively. The results reveal an average grain size of ~ 46 nm, dense dislocation networks, and nanotwins after 10 HPT processing, which contribute to the two-fold hardness increase compared to the as-received condition. Such microstructures also contributed to the overall improved corrosion performance after 10 HPT processing, as quantified by the 83% and 73% reduction in corrosion rate and pitting potential, respectively.
{"title":"Enhanced Microhardness and Corrosion Performance of Additively Manufactured Inconel 718 Specimens through Nanostructuring by Severe Plastic Deformation","authors":"S. M. Yusuf, Nur Hidayah Musa, N. Mazlan, Nong Gao","doi":"10.4028/p-zcdb79","DOIUrl":"https://doi.org/10.4028/p-zcdb79","url":null,"abstract":"Severe plastic deformation (SPD) processes, particularly high-pressure torsion (HPT) have been increasingly applied to metallic specimens fabricated by laser powder bed fusion (L-PBF) additive manufacturing (AM) for enhancing their mechanical and functional properties through nanoscale grain refinement (≤ 100 nm). In this study. L-PBF AM-fabricated Inconel 718 (IN 718) specimens are initially subjected to 10 HPT revolutions to produce nanosized grains. Subsequently, microstructural characterisation, as well as hardness and electrochemical tests are conducted to evaluate the evolution of microstructures, hardness, and corrosion performance of the as-received and HPT-processed specimens by using various microscopy, Vickers microhardness (HV) measurements, and corrosion performance, respectively. The results reveal an average grain size of ~ 46 nm, dense dislocation networks, and nanotwins after 10 HPT processing, which contribute to the two-fold hardness increase compared to the as-received condition. Such microstructures also contributed to the overall improved corrosion performance after 10 HPT processing, as quantified by the 83% and 73% reduction in corrosion rate and pitting potential, respectively.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"228 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140265168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Haga, Toshiaki Okamoto, H. Watari, Shinichi Nishida
The temperature of an aluminum alloy (Al-6%Si) strip cast using a vertical-type high-speed twin-roll caster was measured by inserting a K-type thermocouple into the strip. The effects of the roll diameter on supercooling, cooling rate, and temperature at the roll bite were investigated. It was found that the roll diameter affects the cooling condition of the strip. The thickness of the thermocouple was 0.1 mm and the sampling rate was 100 Hz. Copper rolls with diameters of 300 and 600 mm, respectively, were used. The roll width was 100 mm and the roll speed was 30 m/min. The roll load was 5 or 20 kN.
{"title":"Effect of Roll Diameter on Temperature of Aluminum Alloy Strip during Casting Using a Vertical Type High Speed Twin Roll Caster","authors":"T. Haga, Toshiaki Okamoto, H. Watari, Shinichi Nishida","doi":"10.4028/p-jqcc2k","DOIUrl":"https://doi.org/10.4028/p-jqcc2k","url":null,"abstract":"The temperature of an aluminum alloy (Al-6%Si) strip cast using a vertical-type high-speed twin-roll caster was measured by inserting a K-type thermocouple into the strip. The effects of the roll diameter on supercooling, cooling rate, and temperature at the roll bite were investigated. It was found that the roll diameter affects the cooling condition of the strip. The thickness of the thermocouple was 0.1 mm and the sampling rate was 100 Hz. Copper rolls with diameters of 300 and 600 mm, respectively, were used. The roll width was 100 mm and the roll speed was 30 m/min. The roll load was 5 or 20 kN.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"12 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140263320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Inconel 625 alloy consisting of Ni and Cr and others has advantageous properties such as heat resistance and corrosion resistance, which make it a suitable material for application in aerospace, energy, and marine industries. However, it is also a difficult-to-machine material because of factors such as work hardening, low thermal conductivity, and high tool affinity. Therefore, the problems of the tool wear, chipping, and adhesion often occur in milling of Inconel 625 alloy using end mills. In this study, the milling of Inconel 625 was conducted using coated cemented carbide end mills, and the cutting conditions with the high efficiency were investigated under three rotational speeds and four feed rates. The results showed that increasing the feed rate increased the surface roughness, but did not increase the tool life. In addition, the results also showed that increasing the rotational speed did not increase the tool life, but reduced the surface roughness. As a result, the effects of the rotational speeds and feed rates on the tool life were clarified.
{"title":"High Efficiency Milling of Inconel 625 Alloy (Effect of Cutting Condition on Tool Life)","authors":"Kazumasa Kawasaki, Ryuma Hasegawa","doi":"10.4028/p-7bxhyc","DOIUrl":"https://doi.org/10.4028/p-7bxhyc","url":null,"abstract":"Inconel 625 alloy consisting of Ni and Cr and others has advantageous properties such as heat resistance and corrosion resistance, which make it a suitable material for application in aerospace, energy, and marine industries. However, it is also a difficult-to-machine material because of factors such as work hardening, low thermal conductivity, and high tool affinity. Therefore, the problems of the tool wear, chipping, and adhesion often occur in milling of Inconel 625 alloy using end mills. In this study, the milling of Inconel 625 was conducted using coated cemented carbide end mills, and the cutting conditions with the high efficiency were investigated under three rotational speeds and four feed rates. The results showed that increasing the feed rate increased the surface roughness, but did not increase the tool life. In addition, the results also showed that increasing the rotational speed did not increase the tool life, but reduced the surface roughness. As a result, the effects of the rotational speeds and feed rates on the tool life were clarified.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"28 S1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140265064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The present study evaluated the use of domestic waste polyethylene (PE) in the applications of bituminous pavement. This study investigates the performance of the mixes using different waste PE percentages, i.e., 1%, 2%, 3%, 4% and 5%. It is observed that the softening point and elastic recovery value increase with PE content increases. The penetration index (PI) and temperature susceptibility of binders were evaluated. Adding PE to bitumen shows an improvement in the temperature susceptibility of the modified binders. The Marshall Stability value of bitumen containing 3% PE is higher at 69.65% than virgin binder stability. When 3% PE modified bitumen to the mixes, its indirect tensile strength (ITS) is 70.44 % higher than the conventional mix. The tensile strength ratio (TSR) value improved from 62% (unmodified binder) to 91.18% (modified binder) at 3% PE content, which is 47% higher than the conventional mixture. It indicates that the moisture susceptibility of mixes using PE is higher than conventional mix. Additionally, the mix deformation resistance with 3% PE was found to be 68.75% higher than the mix made with the unmodified binder. The study found that the bituminous mixes using PE have shown higher effectiveness in the properties such as stability, indirect tensile strength, rutting resistance, etc. of the mixes. It indicates that bituminous mixes with modified binders with PE provide higher resistance to permanent deformation.
本研究评估了家用废聚乙烯（PE）在沥青路面中的应用。本研究调查了使用不同废聚乙烯比例（即 1%、2%、3%、4% 和 5%）的混合料的性能。研究发现，随着 PE 含量的增加，软化点和弹性恢复值也随之增加。对粘合剂的渗透指数（PI）和温度敏感性进行了评估。在沥青中添加聚乙烯可改善改性粘合剂的温度敏感性。含 3% PE 的沥青的马歇尔稳定性值为 69.65%，高于原始粘结剂的稳定性。在混合料中添加 3% PE 改性沥青后，其间接抗拉强度（ITS）比传统混合料高 70.44%。PE 含量为 3% 时，拉伸强度比（TSR）值从 62%（未改性粘结剂）提高到 91.18%（改性粘结剂），比传统混合料高 47%。这表明使用聚乙烯的混合料的湿敏性高于传统混合料。此外，研究还发现，使用 3% PE 的混合料的抗变形能力比使用未改性粘结剂的混合料高 68.75%。研究发现，使用聚乙烯的沥青混合料在稳定性、间接抗拉强度、抗车辙等性能方面表现出更高的功效。这表明，使用聚乙烯改性粘结剂的沥青混合料具有更强的抗永久变形能力。
{"title":"Use of Domestic Waste Polyethylene as a Bitumen Modifier in Bituminous Pavement Applications","authors":"Mitali Saharia, Kh.Lakshman Singh","doi":"10.4028/p-lc2bt4","DOIUrl":"https://doi.org/10.4028/p-lc2bt4","url":null,"abstract":"The present study evaluated the use of domestic waste polyethylene (PE) in the applications of bituminous pavement. This study investigates the performance of the mixes using different waste PE percentages, i.e., 1%, 2%, 3%, 4% and 5%. It is observed that the softening point and elastic recovery value increase with PE content increases. The penetration index (PI) and temperature susceptibility of binders were evaluated. Adding PE to bitumen shows an improvement in the temperature susceptibility of the modified binders. The Marshall Stability value of bitumen containing 3% PE is higher at 69.65% than virgin binder stability. When 3% PE modified bitumen to the mixes, its indirect tensile strength (ITS) is 70.44 % higher than the conventional mix. The tensile strength ratio (TSR) value improved from 62% (unmodified binder) to 91.18% (modified binder) at 3% PE content, which is 47% higher than the conventional mixture. It indicates that the moisture susceptibility of mixes using PE is higher than conventional mix. Additionally, the mix deformation resistance with 3% PE was found to be 68.75% higher than the mix made with the unmodified binder. The study found that the bituminous mixes using PE have shown higher effectiveness in the properties such as stability, indirect tensile strength, rutting resistance, etc. of the mixes. It indicates that bituminous mixes with modified binders with PE provide higher resistance to permanent deformation.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"23 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140265084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Metalworking Technologies and Building Materials","authors":"Steven Y. Liang, H. Watari, A. Abioye","doi":"10.4028/b-9mvw2a","DOIUrl":"https://doi.org/10.4028/b-9mvw2a","url":null,"abstract":"","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"30 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140263123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Can Li, Yong Li, Xiao Xing Li, Dexin Zhang, Imran Sardar Muhammad, Yue Liu
The hot processing maps and optimized Arrhenius constitutive model of the TC4 diffusion bonded joint were investigated based on high temperature tensile tests in the temperature range of 1024–1174 K and strain rate range of 0.0001–0.1 s–1. The optimal hot processing parameter in the tensile deformation mode was 0.0001–0.001 s–1/1124 K and 0.0001–0.1 s–1/1174 K, respectively, when the true strain was 0.2. A modified strain compensated Arrhenius-type constitutive model of the joint by combining the evolutionary algorithm and generalized reduced gradient was established. The values of correlation coefficient and average absolute relative error were 0.989 and 7.29%, respectively, indicating the good prediction capabilities.
{"title":"Processing Maps and Optimized Plastic Behavior Model of TC4 Titanium Alloy Diffusion Bonded Joint at α+β Region Temperatures","authors":"Can Li, Yong Li, Xiao Xing Li, Dexin Zhang, Imran Sardar Muhammad, Yue Liu","doi":"10.4028/p-uvb9dt","DOIUrl":"https://doi.org/10.4028/p-uvb9dt","url":null,"abstract":"The hot processing maps and optimized Arrhenius constitutive model of the TC4 diffusion bonded joint were investigated based on high temperature tensile tests in the temperature range of 1024–1174 K and strain rate range of 0.0001–0.1 s–1. The optimal hot processing parameter in the tensile deformation mode was 0.0001–0.001 s–1/1124 K and 0.0001–0.1 s–1/1174 K, respectively, when the true strain was 0.2. A modified strain compensated Arrhenius-type constitutive model of the joint by combining the evolutionary algorithm and generalized reduced gradient was established. The values of correlation coefficient and average absolute relative error were 0.989 and 7.29%, respectively, indicating the good prediction capabilities.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"50 4‐5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140264447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Haga, Kazuki Yamazaki, H. Watari, Shinichi Nishida
Cracks occur on the surface of Al-Mg strips cast using a high-speed twin-roll caster. Surface cracking of the as-cast strip decreases with decreasing roll load. However, the difficulty of roll casting increases as the roll load is decreased because the strip becomes brittle and is easily broken because the strip is not completely solidified. In the present study, an unequal-diameter twin-roll caster, which is capable of high-speed casting, was used with a lip attached to a back-dam plate in an attempt to decrease surface cracking without deceasing the roll load. The thickness of the solidified layer was found to decrease as the length of the solidified region decreased. The thickness of the solidified layer at the center of the width direction of a strip on the lower roll decreased by shortening the solidification length by a lip attached to a back dam-plate. The solidified layer at the edges was thicker than that inside the cast strip. The thickness of semisolid metal inside the cast strip increased more than that at the edges of the roll bite. The roll load at the width of the lip decreased. The effect of the lip length on surface cracks was investigated.
{"title":"Reduction of Surface Cracking for Al-4.6%Mg Strips Cast Surface Using an Unequal-Diameter Twin-Roll Caster by Back-Dam Plate with Lip","authors":"T. Haga, Kazuki Yamazaki, H. Watari, Shinichi Nishida","doi":"10.4028/p-0gcjos","DOIUrl":"https://doi.org/10.4028/p-0gcjos","url":null,"abstract":"Cracks occur on the surface of Al-Mg strips cast using a high-speed twin-roll caster. Surface cracking of the as-cast strip decreases with decreasing roll load. However, the difficulty of roll casting increases as the roll load is decreased because the strip becomes brittle and is easily broken because the strip is not completely solidified. In the present study, an unequal-diameter twin-roll caster, which is capable of high-speed casting, was used with a lip attached to a back-dam plate in an attempt to decrease surface cracking without deceasing the roll load. The thickness of the solidified layer was found to decrease as the length of the solidified region decreased. The thickness of the solidified layer at the center of the width direction of a strip on the lower roll decreased by shortening the solidification length by a lip attached to a back dam-plate. The solidified layer at the edges was thicker than that inside the cast strip. The thickness of semisolid metal inside the cast strip increased more than that at the edges of the roll bite. The roll load at the width of the lip decreased. The effect of the lip length on surface cracks was investigated.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"129 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140078755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Olorundaisi, B. Babalola, M. L. Teffo, P. Olubambi
A high entropy Ni-Al-Ti-Mn-Co-Fe-Cr alloy (HEA) system was fabricated using spark plasma sintering (SPS). The alloys at different elemental compositions were developed at a sintering temperature of 850 °C, a heating rate of 90 °C/min, a pressure of 50 MPa, and a dwelling time of 5 min. The sintered alloys' mechanical characteristics, microstructure, phase evolution, and density were assessed. The evolved microstructure of the sintered HEAs shows a homogenous dispersion of the alloying metals. The sintered microstructures showed a mixture of simple and complex phases. The phase refinement shows that the sintered HEAs exhibited a lower and the least grain size of 2.28 µm compared to the Ni50Al50 alloy having 8.26 µm. Likewise, a higher micro-strain value of 1.25E-1 was attained by the non-equal atomic HEA, while the unalloyed has 1.87E-3. The microhardness value of the sintered alloys varied from 103.5 HV to 139.2 HV, while their measured density varied from 5.23 g/cm3 to 6.44 g/cm3.
{"title":"Mechanical and Microstructural Behavior of Sintered NiAl-Based High Entropy Alloy","authors":"E. Olorundaisi, B. Babalola, M. L. Teffo, P. Olubambi","doi":"10.4028/p-4mp8t4","DOIUrl":"https://doi.org/10.4028/p-4mp8t4","url":null,"abstract":"A high entropy Ni-Al-Ti-Mn-Co-Fe-Cr alloy (HEA) system was fabricated using spark plasma sintering (SPS). The alloys at different elemental compositions were developed at a sintering temperature of 850 °C, a heating rate of 90 °C/min, a pressure of 50 MPa, and a dwelling time of 5 min. The sintered alloys' mechanical characteristics, microstructure, phase evolution, and density were assessed. The evolved microstructure of the sintered HEAs shows a homogenous dispersion of the alloying metals. The sintered microstructures showed a mixture of simple and complex phases. The phase refinement shows that the sintered HEAs exhibited a lower and the least grain size of 2.28 µm compared to the Ni50Al50 alloy having 8.26 µm. Likewise, a higher micro-strain value of 1.25E-1 was attained by the non-equal atomic HEA, while the unalloyed has 1.87E-3. The microhardness value of the sintered alloys varied from 103.5 HV to 139.2 HV, while their measured density varied from 5.23 g/cm3 to 6.44 g/cm3.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"105 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140079821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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