PMID- 31671518 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20200928 IS - 1996-1944 (Print) IS - 1996-1944 (Electronic) IS - 1996-1944 (Linking) VI - 12 IP - 21 DP - 2019 Oct 30 TI - Friction Weldability of a High Nb Containing TiAl Alloy. LID - 10.3390/ma12213556 [doi] LID - 3556 AB - The friction weldability of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y alloy has been investigated by optimizing process parameters and analyzing the microstructures and tensile properties of the joints. The as-cast alloy with a nearly lamellar (NL) microstructure and the as-forged alloys with a duplex (DP) microstructure have been successfully welded. All the joints have a severe deformation zone (SDZ) and a transition zone (TZ) between the parent metal (PM) and SDZ. SDZ, showing a biconcave lens geometry, has a maximum thickness of hundreds of micrometers at the periphery. TZ is hundreds of micrometers thick. All SDZs have a fine-grained DP microstructure with a grain size of a few micrometers. For the joint of the as-cast alloy, the TZ consists of deformed lamellar colonies as the major constituent and partially recrystallized grains as the minor constituent. For the joint of the as-forged alloy, the TZ is similar to both the PM and SDZ, showing a DP microstructure. The grain size, volume fraction of gamma grains, and the remnant lamellar colonies all increase with the distance from the SDZ. All joints presented perfect metallurgical bonding. The strengths of the joints are higher than those of the corresponding PMs. This indicates that the studied alloy has good friction weldability. FAU - Xu, Xiangjun AU - Xu X AUID- ORCID: 0000-0002-0054-5524 AD - School of Materials Science and Engineering, Yangtze Normal University, Chongqing 408100, China. drxxj@yznu.edu.cn. FAU - Lin, Junpin AU - Lin J AD - State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China. linjunpin@ustb.edu.cn. FAU - Guo, Jian AU - Guo J AD - Materials and Chemistry School, Zhongyuan University of Technology, Zhengzhou 450007, China. 5523@zut.edu.cn. FAU - Liang, Yongfeng AU - Liang Y AUID- ORCID: 0000-0002-7531-1108 AD - State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China. Liangyf@skl.ustb.edu.cn. LA - eng GR - 2018-ZD02/University of Science and Technology Beijing/ GR - 162300410342/Natural Science Foundation of Henan Province/ GR - 51831001/National Natural Science Foundation of China/ GR - cstc2018jcyjAX0727/Chongqing Science and Technology Commission/ PT - Journal Article DEP - 20191030 PL - Switzerland TA - Materials (Basel) JT - Materials (Basel, Switzerland) JID - 101555929 PMC - PMC6862385 OTO - NOTNLM OT - friction welding OT - high Nb containing TiAl OT - microstructure OT - recrystallization OT - tensile properties COIS- The authors declare no conflict of interest. EDAT- 2019/11/02 06:00 MHDA- 2019/11/02 06:01 PMCR- 2019/10/30 CRDT- 2019/11/02 06:00 PHST- 2019/10/06 00:00 [received] PHST- 2019/10/24 00:00 [revised] PHST- 2019/10/26 00:00 [accepted] PHST- 2019/11/02 06:00 [entrez] PHST- 2019/11/02 06:00 [pubmed] PHST- 2019/11/02 06:01 [medline] PHST- 2019/10/30 00:00 [pmc-release] AID - ma12213556 [pii] AID - materials-12-03556 [pii] AID - 10.3390/ma12213556 [doi] PST - epublish SO - Materials (Basel). 2019 Oct 30;12(21):3556. doi: 10.3390/ma12213556.