Pseudoelastic CoNiGa high-temperature shape memory alloys (HT-SMAs) show a wide range of tunable transformation temperatures and lower processing costs than conventional Ni-Ti-X HT-SMAs which renders them useful for high-temperature applications in automotive and aerospace industries.The formation of gamma - precipitates is supposed to lead to a significant martensite variant-variant interaction in CoNiGa SMAs. With the SXD Laue Diffractometer we plan to conduct in-situ mechanical compression tests of aged CoNiGa single crystals at elevated temperatures to assess martensite variant-variant interactions which might be the cause for a significant degradation behavior at increased cycle numbers.