Formation of intermetallic compounds （IMCs） during friction stir welding （FSW） of alu- minum/magnesium （AI/Mg） alloys easily results in the pin adhesion and then deteriorates joint formation. The severe pin adhe...Formation of intermetallic compounds （IMCs） during friction stir welding （FSW） of alu- minum/magnesium （AI/Mg） alloys easily results in the pin adhesion and then deteriorates joint formation. The severe pin adhesion transformed the tapered-and-screwed pin into a tapered pin at a low welding speed of 30 mm/min. The pin adhesion problem was solved with the help of ultrasonic. The weldability of Al/Mg alloys was significantly improved due to the good material flow induced by mechanical vibration and the fragments of the IMCs on the surface of a rotating pin caused by acoustic streaming, respectively. A sound joint with ultrasonic contained long Al/Mg interface joining length and complex mixture of AI/Mg alloys in the stir zone, thereby achieving perfect metallurgical bonding and mechanical interlocking. The ultrasonic could broaden process window and then improve tensile properties. The tensile strength of the Al/Mg joint with ultrasonic reached 115 MPa.展开更多
Main text Amyotrophic lateral sclerosis(ALS)is a neurodegenera-tive disease characterized by the selective loss of motor neurons(MNs),resulting in progressive disability and mortality with a rapid course.Current appro...Main text Amyotrophic lateral sclerosis(ALS)is a neurodegenera-tive disease characterized by the selective loss of motor neurons(MNs),resulting in progressive disability and mortality with a rapid course.Current approaches such as multidisciplinary care,disease-modifying therapies,pulmonary intervention,and dietary and nutritional intervention can only slow ALS progression[1].It is imperative to dissect the underlying mechanisms and explore novel treatment targets.展开更多
基金supported by the National Natural Science Foundation of China(No.51204111)the Program for Liaoning Excellent Talents in University(No.LJQ2015084)+1 种基金the China Postdoctoral Science Foundation(No.2016M590821)Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships(No.2017B030302010)
文摘Formation of intermetallic compounds （IMCs） during friction stir welding （FSW） of alu- minum/magnesium （AI/Mg） alloys easily results in the pin adhesion and then deteriorates joint formation. The severe pin adhesion transformed the tapered-and-screwed pin into a tapered pin at a low welding speed of 30 mm/min. The pin adhesion problem was solved with the help of ultrasonic. The weldability of Al/Mg alloys was significantly improved due to the good material flow induced by mechanical vibration and the fragments of the IMCs on the surface of a rotating pin caused by acoustic streaming, respectively. A sound joint with ultrasonic contained long Al/Mg interface joining length and complex mixture of AI/Mg alloys in the stir zone, thereby achieving perfect metallurgical bonding and mechanical interlocking. The ultrasonic could broaden process window and then improve tensile properties. The tensile strength of the Al/Mg joint with ultrasonic reached 115 MPa.
基金supported by grants from Guangdong Basic and Applied Basic Research Foundation(2023A1515010477)the National Natural Science Foundation of China(32000690)+1 种基金the Key-Area Research and Development Program of Guangdong Province,China(2019B030335001)the Key Medical and Health Projects of Panyu District Science and Technology Plan,Guangzhou,China(2023-Z04-103).
文摘Main text Amyotrophic lateral sclerosis(ALS)is a neurodegenera-tive disease characterized by the selective loss of motor neurons(MNs),resulting in progressive disability and mortality with a rapid course.Current approaches such as multidisciplinary care,disease-modifying therapies,pulmonary intervention,and dietary and nutritional intervention can only slow ALS progression[1].It is imperative to dissect the underlying mechanisms and explore novel treatment targets.
