Sian Jiabong universitetining * Aca materiallari * 1550 MPa va ikki tomonlama - {- {- fazasidagi 8,7% cho'zish kuchiga ega, deya ta'rifi Titanium qotishmasi! Ushbu tadqiqot ushbu qotishmadagi ko'p - deformatsiya mexanizmini ketma-ket faollashtirishni tekshiradi.

Titan (TI) va uning qotishmalari juda katta kuch va korroziya qarshiligi kabi ajoyib xususiyatlari tufayli amaliy dasturlarda keng tarqalgan. Metrasali -}} qotishma qotishmalarining mexanik xususiyatlarini takomillashtirish maqsadida yog'ingarchilik kuchayishi eng samarali usuldir. HCPning o'lchamini, morfologiyasi va tarqatish va "BCC" matritsasida cho'kadigan cho'qqilarni taqsimlash orqali dislokatsiya harakati / interfeys orqali to'sqinlik qiladi. Biroq, billur tuzilish, deformatsiya mexanizmi va bosqichma-chuyda kuchli kontsentratsiyaning yuqori darajadagi kontsentratsiyasining yuqori stress kontsentratsiyasiga olib keladi, bu astritylarning astansium qotishmasining asta-sekin pasayishiga olib keladi.

To address the aforementioned issues, three new strategies have recently been proposed. Firstly, activate various plastic mechanisms of the β phase during the plastic deformation process. For example, the activation sequence of the deformation mechanism of the β matrix from dislocation slip to phase transition is regulated by the precipitation of three functional groups α, thereby enhancing the ductility of the alloy. Secondly, constructing unique heterostructures to alleviate interfacial strain incompatibility, thereby achieving the strain distribution/gradient required for uniform plastic deformation. We have also developed layered structures with multi-scale alpha precipitates in biphasic titanium alloys to reduce stress concentration at the alpha/beta interface and improve ductility Thirdly, utilizing the interstitial O/N elements to refine and strengthen the alpha precipitate, thereby reducing the strength difference between the alpha and beta phases. However, the above three strategies rarely regulate the inherent deformation mechanism of low crystal symmetry alpha precipitates, and the independent slip systems of these precipitates are quite limited. Compared with the reported high-strength duplex titanium alloys (yield strength>1100 MPA), bu yangi titan qotishmalari 1500 MPadan oshib ketadi. Biroq, ishlamayotgan og'irligi va bir tekis cho'zilishi tufayli (<3%), these high-strength duplex titanium alloys still provide a balance between strength and ductility. The key to overcoming this dilemma lies in activating multiple plastic mechanisms of the alpha phase to alleviate strain incompatibility between the alpha and beta phases, improve work hardening rate (WHR), and achieve uniform elongation.

Umuman olganda, alfa yog'ingarg'larida yong'oqning asosiy usuli prizmatikdirSlip, tanqidiy hal qilinganligi kabi (CRSS) barcha slip tizimlari orasida eng past. Biroq, faqat ushbu slip tizimiga tayanib, C - AXIS shtammiga moslasha olmaydi va u Teylor Von noto'g'ri ishlangan mezoniga mos kelolmaydi. Shuning uchun piramida shaklini faollashtirish kerakslip, deformation twinning, or phase transition. Unfortunately, due to the different CRSS, these mechanisms are difficult to activate simultaneously, attributed to the inherent high stacking fault energy (SFE,>300 m2 sof alfa ti) va donning kuchli ta'siri. So'nggi tadqiqotlar shuni ko'rsatadiki, C / STOMIDni o'zgartirish mumkinligini ta'kidladi va asosiy slip rejimini prizmatikdan o'zgartiradipiramidalga. Shu bilan birga, alqaring TIning sfe-ni sezilarli darajada kamaytiradi, egizak deformatsiyalarini va hatto HCPdan FCCga o'tishni targ'ib qiladi.

Ushbu stress HCP FCC fazali o'tishiga qaratilgan ZR, HF, HF va TI qotishmalarida kuzatildi. Yuqoridagi natijalardan ilhomlangan holda, biz - {10} - - qotilyulyatsiyasining 7,5mo - qotillikning 7,5mo-{wt ni belgilab yubordik. effekt. Zarra hajmini aniq boshqarib, alfa yog'ingarlarining morfologiyasi, ko'p shkalasi va ko'p kristalli alfa to'yinganlar tayyorlandi. Don katagiga qaramsiz deformatsiya mexanizmidan foydalanib, Sapm amaliy ravishda mos keladigan yukni asta-sekin moslashtirish uchun ko'p shkalasi kristallarida ishlaydi. Ushbu strategiya bizning uchta cho'qqisi titan qotishmasiga 1550/1614 MPa va taxminan 8,7% ni tashkil qiladi, bu avvalgi 8,7% ni, ilgari 8,7% egiluvchanligi, ilgari 8,7% egiluvchanligi, ilgari 8,7% egiluvchanlik, avvalgi 8,7% ni, ilgari 8,7% egiluvchanlik, ilgari 8,7% egiluvchanlik, ilgari 8,7% egilib, ilgarigi 8,7% egri, ilgari 8,7% egiluvchanlik, ilgari 8,7% egilib, ilgarigi 8,7% egilib, avvalgi 8,7% ni, ilgari 8,7% egiluvchanligi, ilgari 8,7% egiluvchanlik, avvalgi 8,7% ni, ilgari 8,7% egiluvchanlik, ilgari 8,7% egilib, avvalgi 8,7% ni, ilgari 8,7% egiluvchanlik, ilgari 8,7% egiluvchanlik, ilgari 8,7% egri, ilgari 8,7% egiluvchanlik, ilgari tez kuchli dubleks qotishum qotishumidan yuqori bo'lgan.

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