單晶γ-TiAl合金疲勞裂紋擴展機制的原子模擬

單晶γ-TiAl合金疲勞裂紋擴展機制的原子模擬Atomic Simulation of Fatigue Crack Growth Mechanism of Single Crystal γ-TiAl Alloy

為了研究TiAl合金的疲勞性能、裂紋擴展與組織形態(tài)的關(guān)系，采用分子動力學方法和速度加載的方式，對含內(nèi)嵌邊界裂紋的單晶γ-TiAl合金在交變載荷循環(huán)加載下，微裂紋擴展及微觀形變機制進行研究。結(jié)果表明：單晶γ-TiAl合金在交變載荷的循環(huán)加載下裂紋擴展過程及微觀形變機制分為三個階段，其力學性能受加載過程中出現(xiàn)的裂紋尖端晶格畸變，棱柱位錯滑移，Lomer-cottrell位錯群形成，堆垛層錯開動，形變孿晶等各種微觀缺陷及其相互作用結(jié)果影響，不同階段的裂紋擴展機理及塑性形變機制完全不同。

In order to study the relationship of fatigue property、crack growth and organization form of TiAl alloy, the micro crack growth and micro deformation mechanism of single crystal γ-TiAl alloy with an embedded boundary crack under cyclic loading were studied by means of molecular dynamics and velocity loading. Results show that the crack growth process and micro deformation mechanism of single crystal γ-TiAl alloy under cyclic loading were divided into three stages. The mechanical properties are affected by the defects of crack tip lattice distortion,prismatic dislocation slip, Lomer-cottrell dislocation group formation,stacking fault start, deformation twin, etc. and their interaction results in the loading process. The mechanism of crack growth and the mechanism of plastic deformation at different stages were quite different. The research results provide a strong theoretical guidance for improving the performance of γ-TiAlalloys under complex external loading conditions.

全文下載：https://pan.baidu.com/s/1oAmRxpC?

作為值得信賴的合作伙伴和高品質(zhì)金屬合金的半成品供應商，通項公司擁有完善的服務體系和專業(yè)的團隊。在同客戶交易的過程中，我們力求根據(jù)不同的應用需求將我們的產(chǎn)品做到精益求精。針對當前和未來的市場需求，通項公司致力于為客戶提供最佳的金屬材料解決方案。

TXCO has been a reliable partner and supplier of sophisticated and high-quality semi-finished products maed of alloys. In dialogue with our customers, we optimise our products to meet the specific application requirements. TXCO develops the best alloy material solutions for current and future challenges.

獲取更多我們供應的產(chǎn)品和服務信息，請致電086-021-6786 0205或發(fā)電子郵件service@sinoav.com聯(lián)系我們，您也可以通過微信，微博，領(lǐng)英，臉書，推特和谷歌+與我們互動。

For more information on the products and services that we supply, call us at 086-021-6786 0205 or email us at service@sinoav.com. You can also get in touch on social media, we are constantly active on Weixin, Weibo, LinkedIn, Facebook, Twitter and Google+.