IF 2.1 4区材料科学

JOM Pub Date : 2025-03-12 DOI: 10.1007/s11837-025-07162-z

Duncan W. Gibbons, Andre F. van der Merwe

{"title":"Pin-Type Bearing Strength and Fracture Behaviour of Ductile LPBF Ti-6Al-4V ELI Produced with Extensively Reused Powder","authors":"Duncan W. Gibbons, Andre F. van der Merwe","doi":"10.1007/s11837-025-07162-z","DOIUrl":"10.1007/s11837-025-07162-z","url":null,"abstract":"<div><p>Metal additive manufacturing is a manufacturing technology that is being investigated for critical industrial applications in industries such as aerospace, nuclear, and medical. A degree of uncertainty remains around these technologies largely due to process and material repeatability, production controls, and a lack of application-specific material data. This research aimed to investigate the effects of extensively reused (175 reuse cycles) Ti-6Al-4V ELI powder feedstock and build orientation on the produced material. Material chemistry, metallography, pin-type bearing strength, and tensile properties were characterized at different build locations and principal orientations. The literature on pin-type bearing strength for both traditionally and additively manufactured material is lacking. Such information is of value for the design of bolted structural joints and fixtures. The results suggest that although extensively reused powder feedstock does experience drift in material properties due to the reuse process, it can still fulfil feedstock material specification requirements. Furthermore, this powder is capable of producing material that meets produced material specification requirements, exhibits minimal orthotropy in mechanical properties, and has ultimate bearing strength that exceeds Ti-6Al-4V grade 5 wrought material allowables. This research provides valuable information for designing structural joints and contributes to the further industrialization of laser powder bed fusion for critical applications.</p></div>","PeriodicalId":605,"journal":{"name":"JOM","volume":"77 4","pages":"1885 - 1897"},"PeriodicalIF":2.1,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11837-025-07162-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143668069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anisotropic Suppression of Martensitic Transformation in Precipitation-Hardened NiTiHf High-Temperature Shape Memory Alloys 沉淀硬化NiTiHf高温形状记忆合金马氏体相变的各向异性抑制

IF 2.1 4区材料科学

JOM Pub Date : 2025-03-11 DOI: 10.1007/s11837-025-07242-0

Eitan Hershkovitz, Timothy Yoo, Flavia da Cruz Gallo, Garrett Baucom, Michele V. Manuel, Honggyu Kim

{"title":"Anisotropic Suppression of Martensitic Transformation in Precipitation-Hardened NiTiHf High-Temperature Shape Memory Alloys","authors":"Eitan Hershkovitz, Timothy Yoo, Flavia da Cruz Gallo, Garrett Baucom, Michele V. Manuel, Honggyu Kim","doi":"10.1007/s11837-025-07242-0","DOIUrl":"10.1007/s11837-025-07242-0","url":null,"abstract":"<div><p>The reversible and diffusionless martensitic transformation of shape memory alloys (SMAs) has spurred their development for shape memory-based devices such as nano- and micro-electromechanical systems. However, when the size of a SMA is reduced to the scale of a few hundred nanometers, its shape memory effect becomes diminished and can eventually be suppressed. To investigate the microscopic origin of this behavior, we have characterized the thermally-induced martensitic transformation in precipitation-hardened NiTiHf high-temperature SMAs, using four-dimensional scanning transmission electron microscopy and in situ heating experiments. We show a distinct anisotropic suppression of the martensitic phase transformation, where B19′ martensite is successfully transformed into B2 austenite, while the reverse transformation is completely suppressed. Quantitative phase and strain analysis reveal strain accumulation in the austenite matrix, specifically a unique buildup of shear strain surrounding precipitates embedded in the matrix phase. This result indicates that the suppression of the martensitic transformation in precipitation-hardened SMAs is not solely due to extrinsic effects like the buildup of non-transforming oxides on the alloy surface, and that there is an additional intrinsic mechanism inhibiting the full shape memory transformation. Our findings encourage future research on the feasibility of scalable shape memory devices in the sub-hundred nanometer regime.</p></div>","PeriodicalId":605,"journal":{"name":"JOM","volume":"77 5","pages":"2852 - 2861"},"PeriodicalIF":2.1,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Meet 2025 TMS President Dan Miracle 这是2025年TMS总裁Dan Miracle

IF 2.1 4区材料科学

JOM Pub Date : 2025-03-11 DOI: 10.1007/s11837-025-07296-0

Dan Miracle

引用次数: 0

Dr. James Douglas: The Founder of American Copper 詹姆斯-道格拉斯博士美国铜业的创始人

IF 2.1 4区材料科学

JOM Pub Date : 2025-03-10 DOI: 10.1007/s11837-025-07297-z

Phillip Mackey, William Culver

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Artificial Intelligence, ICME, and 3D Materials Science Meet at TMS Specialty Congress 2025 人工智能，ICME和3D材料科学在2025年TMS专业大会上会面

IF 2.1 4区材料科学

JOM Pub Date : 2025-03-06 DOI: 10.1007/s11837-025-07299-x

Megan Enright

引用次数: 0

JOM Technical Topics JOM技术主题

IF 2.1 4区材料科学

JOM Pub Date : 2025-03-06 DOI: 10.1007/s11837-025-07294-2

引用次数: 0

TMS Meeting Headlines TMS会议头条

IF 2.1 4区材料科学

JOM Pub Date : 2025-03-06 DOI: 10.1007/s11837-025-07300-7

引用次数: 0

Microstructure and Mechanical Properties of Mg-Al-Zn Alloy Prepared by SPS Sintering–Extrusion Combined Forming SPS烧结-挤压复合成形Mg-Al-Zn合金的组织与力学性能

IF 2.1 4区材料科学

JOM Pub Date : 2025-03-06 DOI: 10.1007/s11837-025-07272-8

Tao Wang, Xin Cao, Feng Zhong, Xu Cheng, Ming Liang, Yanhui Liu, Jianfeng Li

{"title":"Microstructure and Mechanical Properties of Mg-Al-Zn Alloy Prepared by SPS Sintering–Extrusion Combined Forming","authors":"Tao Wang, Xin Cao, Feng Zhong, Xu Cheng, Ming Liang, Yanhui Liu, Jianfeng Li","doi":"10.1007/s11837-025-07272-8","DOIUrl":"10.1007/s11837-025-07272-8","url":null,"abstract":"<div><p>To improve the poor plasticity and low absolute strength of magnesium alloy at room temperature, the Mg-Al-Zn (AZ91) magnesium alloy was prepared using spark plasma sintering (SPS)–extrusion combined forming, and the microstructure and mechanical properties were studied in depth. The results showed that the microstructure of the SPS-sintered AZ91 alloy was composed of equiaxed prior particles, and that the compactness of the microstructure was low. There were micropores and oxide layers at the prior particle boundaries. The average grain size was 6.42 μm, and the ultimate tensile strength (UTS) and elongation (El) were 165.3 ± 5.8 MPa and 2.4 ± 0.1%, respectively. After extrusion deformation, the equiaxed prior particles were elongated along the extrusion direction, showing a long strip shape, and the compactness of the microstructure was significantly improved. The precipitated phase and oxide layer continuously distributed at the sintering neck were broken and refined into fine particles, which were dispersed along the prior particle boundaries. The average grain size was 2.16 μm, and its UTS and El were 321.4 ± 2.4 MPa and 5.0 ± 0.3%, respectively. The improvement of the mechanical properties was mainly attributed to the combined effect of increased microstructure compactness, improved bonding strength between prior particles, grain refinement.</p></div>","PeriodicalId":605,"journal":{"name":"JOM","volume":"77 5","pages":"2797 - 2810"},"PeriodicalIF":2.1,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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TMS Member News TMS会员新闻

IF 2.1 4区材料科学

JOM Pub Date : 2025-03-06 DOI: 10.1007/s11837-025-07295-1

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Donors Build on TMS Foundation Success in 2024 捐款人将在TMS基金会2024年取得成功

IF 2.1 4区材料科学

JOM Pub Date : 2025-03-05 DOI: 10.1007/s11837-025-07298-y

Kaitlin Calva

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