Pulling autogrowth events by file name from default trace
As Remus mentioned in a comment, you have to join the trace table result to sys.master_files to get the physical file names.

Here is a completed query. Note that the duration in the trace is in microseconds, and I have adjusted the computation accordingly to output a more sensible metric (hopefully you don't have actual minutes of auto-growth happening):

DECLARE @trcfilename nvarchar(2048);
SELECT @trcfilename = path FROM sys.traces WHERE is_default = 1;

SELECT
    DB_NAME(mf.database_id) AS DatabaseName,
    mf.name AS LogicalFileName,
    mf.physical_name AS PhysicalFileName,
    a.NumberOfGrowths,
    CAST(a.DurationOfGrowthsInSeconds AS decimal(18, 3)) AS DurationOfGrowthsInSeconds
    FROM
    (
        SELECT
            tt.DatabaseID AS database_id,
            tt.FileName AS LogicalFileName,
            COUNT(*) AS NumberOfGrowths,
            SUM(tt.Duration / (1000 * 1000.0)) AS DurationOfGrowthsInSeconds
            FROM sys.fn_trace_gettable(@trcfilename, default) tt
            WHERE (EventClass IN (92, 93))
            GROUP BY
                tt.DatabaseID,
                tt.FileName
    ) a
    INNER JOIN sys.master_files mf ON
        (mf.database_id = a.database_id) AND
        (mf.name = a.LogicalFileName);